CN107794440B - High strength air intake manifold support - Google Patents
High strength air intake manifold support Download PDFInfo
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- CN107794440B CN107794440B CN201710759565.1A CN201710759565A CN107794440B CN 107794440 B CN107794440 B CN 107794440B CN 201710759565 A CN201710759565 A CN 201710759565A CN 107794440 B CN107794440 B CN 107794440B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
Abstract
The invention relates to a support, in particular to an air inlet manifold support, and belongs to the field of hot rolled steel materials. The high-strength intake manifold bracket is made of a hot rolled steel material, and the hot rolled steel material comprises the following components in percentage by mass: c: 0.1-0.2%, Si: 0.1-0.35%, Mn: 0.2-0.5%, Nb: 0.01-0.02%, Ti: 0.02-0.04%, V: 0.015-0.03%, P: less than or equal to 0.045%, S: less than or equal to 0.045 percent and the balance of Fe. The invention adopts steel materials with reasonable compatibility, and adopts micron TiN and micron Al2O3And the micron ZrC particle additive purifies molten steel, can promote the refinement of ferrite grains, and enhances the strength and rigidity of the obtained high-strength intake manifold bracket.
Description
Technical Field
The invention relates to a support, in particular to an intake manifold support, and belongs to the field of hot rolled steel materials.
Background
The intake manifold is located between the throttle and the engine intake valve and is called the "manifold" because after air enters the throttle and passes through the manifold buffer system, the air flow path is "branched" here, corresponding to the number of engine cylinders, e.g., four for a four cylinder engine and five for a five cylinder engine, which introduces air into each cylinder separately. In the case of a natural intake engine, since the intake manifold is located behind the throttle valve, when the opening degree of the engine throttle is small, a sufficient amount of air cannot be sucked into the cylinder, and the manifold vacuum degree is high; when the engine accelerator opening is large, the degree of vacuum in the intake manifold decreases.
In practical application, the intake manifold bracket is also greatly limited due to short service life and low strength of the intake manifold bracket caused by environmental factors.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-strength intake manifold support.
The high-strength intake manifold support is made of a hot rolled steel material, and the hot rolled steel material comprises the following components in percentage by mass: c: 0.1-0.2%, Si: 0.1-0.35%, Mn: 0.2-0.5%, Nb: 0.01-0.02%, Ti: 0.02-0.04%, V: 0.015-0.03%, P: less than or equal to 0.045%, S: less than or equal to 0.045 percent and the balance of Fe.
The high-strength intake manifold bracket is made of steel, and the C content is 0.1-0.2%, so that the high-strength intake manifold bracket is low-carbon steel, has low strength and hardness, and has good plasticity and toughness. Meanwhile, the steel used by the invention is carburizing steel, has a high-carbon wear-resistant layer and a low-carbon high-strength toughness core, and can bear huge impact load, contact stress and abrasion.
The high-strength intake manifold bracket of the invention uses steel with too high carbon content, which can cause the core part not to have enough toughness and strength, therefore, the invention selects the C content of 0.1-0.15% to ensure the core part to have enough toughness and strength.
In addition, in order to improve the hardenability of the steel and further improve the toughness and the strength of the core, the invention also adds a proper amount of Mn element, and Mn is dissolved in ferrite to play a solid solution strengthening role for the steel. As the Mn content increases, the grain boundary ferrite is tapered due to the inhibition of grain boundary ferrite nucleation, and the toughness of the coarse grain region is improved. However, the Mn content is too high, a large number of brittle structure M-A islands are formed in a coarse crystal region, and the low-temperature toughness of the coarse crystal region is deteriorated again, so that the Mn element with the content can ensure that the crystal refinement is not influenced when the core has enough toughness and strength.
In the invention, the Nb element is added on the basis of the Mn element, so that NbC and NbN compounds can be formed in the steel, in the recrystallization process, the recrystallization time can be greatly prolonged due to the pinning of the dislocation by the NbC and the NbN and the prevention of the migration of the subgrain boundary, and the Nb has the strongest effects of preventing the austenite from recovering and recrystallizing, thereby playing the role of refining grains and enhancing the strength of the obtained steel.
In addition, trace V element is added, the V element has strong affinity with V, N, dispersed small particles of V (C, N) can be formed, the pinning effect on austenite grain boundaries can be realized, the austenite grain boundary migration can be hindered, the coarsening temperature of steel is improved, and simultaneously the formed V (C, N) is separated out at a phase interface during the transformation period from austenite to ferrite, so that the growth of ferrite crystal is effectively prevented, and the effect of refining ferrite grains is realized.
In addition, the invention also adds trace Ti element, Ti in steel is dispersed and precipitated by TiN and Tic, and can become solid crystal nucleus when molten steel is solidified, thus being beneficial to crystallization and refining steel structure. Ti is also an extremely active metal element, can generate insoluble carbide particles with iron and carbon, and is concentrated at a crystal boundary to prevent the coarsening of crystal grains.
Another object of the present invention is to provide a method for manufacturing the high strength intake manifold bracket, the method comprising the steps of:
smelting: adding a steel material for preparing the high-strength intake manifold support into a converter to melt, then hoisting molten steel to a ladle refining furnace to refine, and pouring after discharging to obtain a steel material;
and (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank;
and (3) post-treatment: and (4) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank to obtain a high-strength intake manifold support finished product.
In the above method for manufacturing a high-strength intake manifold bracket, the molten steel is further added with a particulate additive before being hoisted to a ladle for refining, and the particulate additive comprises the following components: micron TiN: 5-10 parts of micron Al2O35-10 parts of micron ZrC: 2-5 parts. The invention adds particle additive into molten steel to make them as nucleation core of phase change and increase nucleation rate, when the molten steel is full of fine dispersed nano particles, these refractory particles become the core of heterogeneous nucleation of molten steel in the course of molten steel solidification, and the heterogeneous nucleation rate is greatly promoted, so that the refined solidification austenite initial phase is obtained and the austenite crystal interface area is increased. In the subsequent phase transformation and hot working processes, the ferrite preferential nucleation points are increased, so that the ferrite nucleation rate is increased. Meanwhile, the added particles in the austenite grains become the phase transformation nucleation cores again, and the refinement of ferrite grains is promoted. The invention adopts the addition particlesThe method of the particle additive can ensure that the strength of the obtained intake manifold bracket is high.
Preferably, the addition amount of the particulate additive is 0.02 to 0.04% by mass of the steel material.
In the above method of manufacturing a high strength intake manifold bracket, the particulate additive has a diameter of 1 to 1.5 um.
In the preparation method of the high-strength intake manifold bracket, the particle additive is mixed with equal amount of iron powder, stirred, pressed into small particles and then added into molten steel. The particle additive adopts a dispersion method, which can reduce the agglomeration of particles in the particle additive and fully disperse the components in the particle additive in the molten steel.
In the above method for manufacturing a high-strength intake manifold bracket, the normalizing treatment is a sub-temperature normalizing treatment. The steel has low carbon content, belongs to low-carbon steel, has low strength and hardness, and can refine the structure and improve the performance of the steel by normalizing treatment, so that the cutting processability is improved, and the preparation is made for subsequent machining. Moreover, the invention adopts the sub-temperature normalizing, which is a treatment process of heating between Ac1-Ac3 temperature, keeping the temperature and then cooling in air. The invention adopts the sub-temperature normalizing process, can reduce the dispersion degree of carbide, eliminate granular bainite, obviously improve the cutting performance and improve the processing quality; meanwhile, the reasonable matching between the fine grain structure obtained by sub-temperature normalizing and each phase structure of undissolved ferrite not only can improve the cutting performance, but also has good comprehensive mechanical performance.
In the preparation method of the high-strength intake manifold bracket, the temperature of the sub-temperature normalizing treatment is 900-950 ℃, and the time is 25-35 min. The invention controls the temperature and time of the sub-temperature normalizing treatment in the range, can increase the austenitizing degree, and the hardness and the strength of the material are obviously increased because the content of M/A islands in a granular bainite structure is increased, the size is increased, the distribution is more dispersed, the content of twin crystal martensite is increased, and the dispersion strengthening effect of the M/A islands is gradually increased.
In the preparation method of the high-strength intake manifold bracket, the carburizing treatment temperature is 950-. The carbon content of the steel adopted by the invention is low, so that the carburization treatment is carried out to form the gradient change of the carbon concentration on the surface layer of the workpiece from high to low so as to promote the gradient change of the structure performance of the part from the surface to the core, thereby forming the gradient material on the surface of the part, improving the surface hardness, the wear resistance and the fatigue resistance of the part, and keeping the good toughness of the core.
In the preparation method of the high-strength intake manifold bracket, the quenching temperature is 850-900 ℃, and the quenching time is 2-3 h.
In the above method for preparing the high-strength intake manifold bracket, the tempering includes primary tempering at a temperature of 540-. The invention adopts secondary tempering, can prevent the occurrence of tempering brittleness, simultaneously reduces the brittleness and eliminates or reduces the internal stress.
In the preparation method of the high-strength intake manifold bracket, the working pressure of shot blasting treatment is 3.5-4.0Bar, the moving speed of the nozzle is 200-. After the surface of the workpiece is subjected to shot peening treatment, the texture structure of the surface layer of the workpiece can be obviously changed, such as surface layer grain refinement, dislocation density increase, retained austenite reduction and the like. The change in texture is indicative of a change in the surface properties of the workpiece.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts steel materials with reasonable compatibility, and adopts micron TiN and micron Al2O3And the micron ZrC particle additive purifies molten steel, can promote the refinement of ferrite grains, and enhances the strength and rigidity of the obtained high-strength intake manifold bracket.
2. According to the invention, low-carbon steel is adopted, sub-temperature normalizing and other methods are adopted in the preparation process, and Mn, Nb, Ti and V elements are added into the steel, so that the strength of the obtained intake manifold bracket is high;
3. the high-strength intake manifold bracket provided by the invention adopts special steel and is provided with a reasonable preparation method, so that the obtained intake manifold bracket is high in strength, light and thin in material, convenient to use and strong in plasticity.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Example 1:
smelting: adding the following steel components into a converter to melt, then hoisting molten steel to a ladle refining furnace to refine, and adding a particle additive with the mass of 0.02% of the steel mass and the diameter of 1 mu m before refining, wherein the particle additive comprises the following components: micron TiN: 5 parts of micron Al2O35 parts of micron ZrC: 2 parts of (1); after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.1%, Si: 0.1%, Mn: 0.2%, Nb: 0.01%, Ti: 0.02%, V: 0.015%, P: 0.02%, S: 0.02% and the balance Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at 900 ℃ for 25 min; the carburizing treatment temperature is 950 ℃, the time is 5 hours, and the carburizing treatment thickness is 3.8 mm; the quenching temperature is 850 ℃ and the time is 2 hours; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 540 ℃ and the time is 3 hours, and the secondary tempering temperature is 520 ℃ and the time is 2.5 hours;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 3.5Bar, the moving speed of a nozzle is 200mm/min, and the shot flow is 8 kg/min.
The components of the particle additive are as follows: micron TiN: 6 parts of micron Al2O36 parts of micron ZrC: 2 parts of (1); after the steel is taken out of the furnace, casting to obtain steel;
and (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at the temperature of 910 ℃ for 27 min; the carburizing treatment temperature is 980 ℃, the time is 6 hours, and the carburizing treatment thickness is 4.1 mm; the quenching temperature is 860 ℃ and the time is 2.2 hours; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 560 ℃, the time is 3.4h, the secondary tempering temperature is 540 ℃, and the time is 2.8 h;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 3.6Bar, the moving speed of a nozzle is 210mm/min, and the shot flow is 8.4 kg/min.
Example 2:
smelting: adding the following steel components into a converter, melting, hoisting molten steel into a ladle refining furnace for refining, and adding a granular additive with the mass of 0.024% of that of the steel and the diameter of 1.1 mu m before refining, wherein the granular additive comprises the following components: micron TiN: 6 parts of micron Al2O36 parts of micron ZrC: 2 parts of (1); after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.12%, Si: 0.15%, Mn: 0.26%, Nb: 0.012%, Ti: 0.024%, V: 0.018%, P: 0.015%, S: 0.02% and the balance Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at the temperature of 910 ℃ for 27 min; the carburizing treatment temperature is 980 ℃, the time is 6 hours, and the carburizing treatment thickness is 4.1 mm; the quenching temperature is 860 ℃ and the time is 2.2 hours; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 560 ℃, the time is 3.4h, the secondary tempering temperature is 540 ℃, and the time is 2.8 h;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 3.6Bar, the moving speed of a nozzle is 210mm/min, and the shot flow is 8.4 kg/min.
Example 3:
smelting: adding the following steel components into a converter to melt, then hoisting molten steel to a ladle refining furnace to refine, and adding a granular additive with the mass of 0.028% and the diameter of 1.2 mu m into the steel before refining, wherein the granular additive comprises the following components: micron TiN: 7 parts of micron Al2O37 parts of micron ZrC: 3 parts of a mixture; after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.14%, Si: 0.2%, Mn: 0.32%, Nb: 0.014%, Ti: 0.028%, V: 0.021%, P: 0.03%, S: 0.03 percent and the balance of Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at 920 ℃ for 29 min; the carburizing treatment temperature is 1010 ℃, the time is 7 hours, and the carburizing treatment thickness is 4.4 mm; the quenching temperature is 870 ℃, and the time is 2.4 hours; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 580 ℃ and the time is 3.8 hours, and the secondary tempering temperature is 560 ℃ and the time is 3.1 hours;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 3.7Bar, the moving speed of a nozzle is 220mm/min, and the shot flow is 8.8 kg/min.
Example 4:
smelting: adding the following steel components into a converter to melt, then hoisting molten steel to a ladle refining furnace to refine, and adding a particle additive with the mass of 0.032% of the steel mass and the diameter of 1.3 mu m before refining, wherein the particle additive comprises the following components: micron TiN: 8 parts of micron Al2O38 parts of micron ZrC: 4 parts of a mixture; after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.16%, Si: 0.25%, Mn: 0.38%, Nb: 0.016%, Ti: 0.032%, V: 0.024%, P: 0.02%, S: 0.03 percent and the balance of Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at 930 ℃ for 31 min; the carburizing treatment temperature is 1040 ℃, the time is 8 hours, and the carburizing treatment thickness is 4.7 mm; the quenching temperature is 880 ℃, and the time is 2.6 h; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 600 ℃, the time is 4.2 hours, the secondary tempering temperature is 580 ℃, and the time is 3.4 hours;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 3.8Bar, the moving speed of a nozzle is 230mm/min, and the shot flow is 9.2 kg/min.
Example 5:
smelting: adding the following steel components into a converter to melt, then hoisting molten steel to a ladle refining furnace to refine, and adding a particle additive with the mass of 0.036% of the steel mass and the diameter of 1.4 mu m before refining, wherein the particle additive comprises the following components: micron TiN: 9 parts of micron Al2O39 parts of micron ZrC: 4 parts of a mixture; after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.18%, Si: 0.3%, Mn: 0.44%, Nb: 0.018%, Ti: 0.036%, V: 0.028%, P: 0.03%, S: 0.02% and the balance Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at 940 ℃ for 33 min; the carburizing treatment temperature is 1070 ℃, the time is 9 hours, and the carburizing treatment thickness is 5 mm; the quenching temperature is 890 ℃ and the time is 2.8 h; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 620 ℃, the time is 4.6 hours, the secondary tempering temperature is 600 ℃, and the time is 3.7 hours;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 7.9Bar, the moving speed of a nozzle is 240mm/min, and the shot flow is 9.6 kg/min.
Example 6:
smelting: adding the following steel components into a converter to be melted, hoisting molten steel into a ladle refining furnace to be refined, and adding a particle additive with the mass of 0.04 percent of the steel mass and the diameter of 1.5 mu m before refining, wherein the particle additive comprises the following components: micron TiN: 10 parts of micron Al2O310 parts of micron ZrC: 5 parts of a mixture; after the steel is taken out of the furnace, casting to obtain steel; wherein the steel comprises the following components: c: 0.2%, Si: 0.35%, Mn: 0.5%, Nb: 0.02%, Ti: 0.04%, V: 0.03%, P: 0.035%, S: 0.015 percent and the balance of Fe.
And (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain a high-strength intake manifold support blank, wherein the normalizing is sub-temperature normalizing at 950 ℃ for 35 min; the carburizing treatment temperature is 1100 ℃, the time is 10 hours, and the carburizing treatment thickness is 5.2 mm; the quenching temperature is 900 ℃ and the time is 3 h; the tempering treatment comprises primary tempering and secondary tempering, wherein the primary tempering temperature is 650 ℃ for 5 hours, and the secondary tempering temperature is 630 ℃ for 4 hours;
and (3) post-treatment: and (3) carrying out shot blasting treatment and cold correction treatment on the high-strength intake manifold support blank, and then packaging to obtain a high-strength intake manifold support finished product, wherein the working pressure of the shot blasting treatment is 4.0Bar, the moving speed of a nozzle is 250mm/min, and the shot flow is 10 kg/min.
Comparative example 1
This comparative example differs from example 1 only in that it contains no Nb, and is otherwise the same as example 1 and will not be described again here.
Comparative example 2
This comparative example differs from example 1 only in that it contains no Ti, is otherwise the same as example 1, and will not be described again here.
Comparative example 3
This comparative example differs from example 1 only in that it does not contain V, and is otherwise the same as example 1 and will not be described again here.
Comparative example 4
This comparative example differs from example 1 only in that it does not contain particulate additives, and is otherwise the same as example 1 and will not be repeated here.
Comparative example 5
This comparative example differs from example 1 only in that it employs only the first tempering treatment, and is otherwise the same as example 1 and will not be described again here.
The high strength intake manifold brackets of examples 1-6 and comparative examples 1-5 were subjected to performance tests, the results of which are shown in the following table.
Therefore, the high-strength intake manifold bracket provided by the invention adopts special steel and is reasonably prepared, so that the obtained intake manifold bracket is high in strength, light and thin in material, convenient to use and strong in plasticity.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (3)
1. A high strength intake manifold support made of a hot rolled steel material consisting of, in mass percent: c: 0.1-0.2%, Si: 0.1-0.35%, Mn: 0.2-0.5%, Nb: 0.01-0.02%, Ti: 0.02-0.04%, V: 0.015-0.03%, P: less than or equal to 0.045%, S: less than or equal to 0.045 percent and the balance of Fe;
the preparation method of the high-strength intake manifold bracket comprises the following steps:
smelting: adding a steel material for preparing the high-strength intake manifold bracket into a converter to melt, hoisting molten steel to a ladle refining furnace to refine, and pouring after discharging to obtain a steel material; before the molten steel is hoisted to a ladle for refining, a particle additive with the steel quality of 0.02-0.04 percent is also added, and the components of the particle additive are as follows: micron TiN: 5-10 parts of micron Al2O35-10 parts of micron ZrC: 2-5 parts; the particle additive is mixed with equal amount of iron powder, stirred, pressed into small particles and added into molten steel;
and (3) heat treatment: normalizing, carburizing, quenching and tempering the steel to obtain an intake manifold support blank; the normalizing treatment is sub-temperature normalizing treatment, the temperature is 900-950 ℃, and the time is 25-35 min; the temperature of the carburizing treatment is 950-; the tempering comprises primary tempering and secondary tempering, wherein the temperature of the primary tempering is 540-650 ℃ for 3-5h, the temperature of the secondary tempering is 520-630 ℃ for 2.5-4 h;
and (3) post-treatment: and performing shot blasting treatment and cold correction treatment on the air inlet manifold blank to obtain an air inlet manifold bracket finished product.
2. The high strength intake manifold carrier in accordance with claim 1, wherein said particulate additive has a diameter of 1-1.5 um.
3. The high-strength intake manifold bracket as claimed in claim 1, wherein the quenching temperature is 850-900 ℃ and the quenching time is 2-3 h.
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| 外加纳米粒子强化钢铁材料研究的新进展;李胜利等;《辽宁科技大学学报》;20160430;第39卷(第2期);2.1钢中外加粒子的主要作用、2.2钢中外加粒子的选取原则 * |
| 用亚温正火改善钢材的切削加工性能;赵海军等;《金属热处理》;19900531;第49页右上栏 * |
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