CN103643169B - A kind of Exhaust valve head material containing Ce and preparation method thereof - Google Patents
A kind of Exhaust valve head material containing Ce and preparation method thereof Download PDFInfo
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- CN103643169B CN103643169B CN201310617756.6A CN201310617756A CN103643169B CN 103643169 B CN103643169 B CN 103643169B CN 201310617756 A CN201310617756 A CN 201310617756A CN 103643169 B CN103643169 B CN 103643169B
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Abstract
The invention discloses a kind of Exhaust valve head material containing Ce and preparation method thereof.The alloying constituent weight percent content of employing of the present invention is: C:0.32 ~ 0.40%; Si:0.17 ~ 0.37%; Mo:1.0 ~ 2.0%; Mn:6.5 ~ 8.0%; Cr:15 ~ 18%; W:0.50 ~ 1.0%; Ni:1.5 ~ 2.5%; Ce:0.50 ~ 1.0%; P :≤0.015; S :≤0.015; Cu :≤0.010%; Clout is Fe.This valve material forms through low-pressure casting, rolling, thermal treatment.The Good Heat-resistance of head portion that material of the present invention, Heat stability is good, especially hot strength are high, the life-span is high.
Description
Technical field
The invention belongs to metal material field, particularly relate to a kind of Exhaust valve head material containing Ce and preparation method thereof.
Background technology
Valve is one of vital part of engine, and it is used to the direct part opening or closing inlet and outlet road.Valve is the sealing member that in engine working process, sealed combustion chamber and control engine gas exchange, and is the vitals ensureing engine power performance, economy, reliability.Valve is divided into inlet valve and blast gate, air is entered in engine cylinder by inlet valve and burns with fuel mix, burning after produce waste gas discharge cylinder by blast gate, thus realize fresh air enter cylinder combustion produce vehicle travel power and scavenge.The working conditions of valve is severe, and the working temperature of inlet valve can reach about 600 degree; The working temperature of blast gate can reach about 800 degree.Inlet valve mainly bears the repeated stock load in opening-closing process, blast gate is except the machinery bearing repeated stock meets, also bear the corrosion of high-temperature oxidizing gas and thermal stresses, conical surface thermal hoop-stress and burning time the acting in conjunction such as gaseous tension time, valve bears the impact repeated load and spring pressure that are caused by inertia when taking a seat, the high speed of high temperature corrosion gas is washed away, more strict to the material requirements of blast gate, require that blast gate has enough hot strengths, good wear resistance and work-ing life, good antioxidant property.
In addition, engine is usually transshipped.Due to overlond running, generally can aggravate to start built-in temperature significantly to promote, make the actual work temperature of valve too high, cause that the tissue of valve material changes, strength degradation.The hot strength of valve is not high, is the principal element of valve premature deterioration, the lost of life.These factors propose following requirement to blast gate: 1, must have rational physical dimension, little to gas-flow resistance, improve inflation and the exhaust efficiency of cylinder, ensure dynamic property and the economy of engine.2, enough hot strengths must be had, at high temperature can bear very large impact load effect.3, good wear resistance and work-ing life must be had.4, good antioxidant property must be had.With regard to the material that blast gate uses, need to have enough hot strengths, good wear resistance and work-ing life, good antioxidant property etc.
At present, the head material mainly 21-4N of blast gate, the kind of material is very single, and hot strength is not high, under the high temperature more than 800 degree, organize and easily change, and can not meet the service requirements of some engines.
Summary of the invention
Goal of the invention: deposit a kind of Exhaust valve head material containing Ce and preparation method thereof for prior art, this material for exhaust valves has excellent hot strength performance.
Technical scheme: for realizing technique scheme, a kind of Exhaust valve head material containing Ce that the invention provides, the alloying constituent weight percentage ranges that this Exhaust valve head material adopts is C:0.32 ~ 0.40%; Si:0.17 ~ 0.27%; Mo:1.0 ~ 2.0%; Mn:6.5 ~ 8.0%; Cr:15 ~ 18%; W:0.50 ~ 1.0%; Ni:1.5 ~ 2.5%; Ce:0.50 ~ 1.0%; Surplus to be purity be 99.8% Fe, wherein, to be the impurity weight percent content in the Fe of 99.8% be described purity: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%.
The manufacture method of the above-mentioned Exhaust valve head material containing Ce, comprises following processing step:
(1) prepare batching according to alloy component range, mix;
(2) adopt vacuum induction melting, temperature controls at 1620 ~ 1680 DEG C, melting 1 ~ 1.5 hour;
(3) adopt low-pressure casting, foundry goods, again through roll forming, controls the deflection of last rolling more than 40%;
(4) be heated to 1050 ~ 1150 DEG C of insulations 0.5 ~ 1 hour, quenching, this heat treatment step can improve the obdurability of material, and can crystal grain thinning;
(5) be heated to 800 ~ 820 DEG C of insulations 3 ~ 4 hours, quenching, obtains Exhaust valve head material.By this heat treatment step, materials microstructure performance can be improved.
Wherein, the processing condition of the low-pressure casting described in step (3) are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times.
Beneficial effect: alloy excellent combination property of the present invention, hot strength is high, the life-span is high.This alloy contains Ce element, defines rare-earth phase, for 21-4N material, substantially increases the hot strength of 800 DEG C, high-temperature cycle life, scratch-resistant performance.Adopt low-pressure casting, improve compactness and the purity of alloy material; Adopt twice heat treated mode, ensure the intensity of alloy material, hot strength and thermostability and life-span.
Embodiment
The purity used in each embodiment is below the weight percent content of impurity in the Fe of 99.8: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%.
Embodiment 1
The Exhaust valve head material concrete steps prepared containing Ce through low-pressure casting, rolling, thermal treatment are as follows:
(1) prepare burden, the weight alloy percent composition that Exhaust valve head material adopts is: C:0.32%; Si:0.25%; Mo:2.0%; Mn:6.50%; Cr:15%; W:0.50%; Ni:2.0%; Ce:1.0%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1620 DEG C, melting 1.5 hours;
(3) adopt low-pressure casting, the processing condition of low-pressure casting are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times, foundry goods again through roll forming, rolling three times, the deflection of last rolling is 45%;
(4) 1050 DEG C of insulations 1 hour is heated to, quenching;
(5) be heated to 800 DEG C of insulations 4 hours, quenching, obtains Exhaust valve head material.The high-temperature yield strength test result of prepared Exhaust valve head material is as shown in table 1.
Embodiment 2
The Exhaust valve head material concrete steps prepared containing Ce through low-pressure casting, rolling, thermal treatment are as follows:
(1) prepare burden, the weight alloy percent composition that Exhaust valve head material adopts is: C:0.32%; Si:0.25%; Mo:2.0%; Mn:6.50%; Cr:15%; W:0.50%; Ni:2.0%; Ce:1.0%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1680 DEG C, melting 1.5 hours;
(3) adopt low-pressure casting, the processing condition of low-pressure casting are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times, foundry goods again through roll forming, rolling three times, the deflection of last rolling is 45%;
(4) 1150 DEG C of insulations 0.5 hour is heated to, quenching;
(5) be heated to 820 DEG C of insulations 3 hours, quenching, obtains Exhaust valve head material.The high-temperature yield strength test result of prepared Exhaust valve head material is as shown in table 1.
Embodiment 3
The Exhaust valve head material concrete steps prepared containing Ce through low-pressure casting, rolling, thermal treatment are as follows:
(1) prepare burden, the weight alloy percent composition that Exhaust valve head material adopts is: C:0.34%; Si:0.27%; Mo:1.0%; Mn:6.60%; Cr:17.00%; W:0.80%; Ni:1.7%; Ce:0.75%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1620 DEG C, melting 1.5 hours;
(3) adopt low-pressure casting, the processing condition of low-pressure casting are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times, foundry goods again through roll forming, rolling three times, the deflection of last rolling is 55%;
(4) 1100 DEG C of insulations 0.5 hour is heated to, quenching;
(5) be heated to 800 DEG C of insulations 3 hours, quenching, obtains Exhaust valve head material.The high-temperature yield strength test result of prepared Exhaust valve head material is as shown in table 1.
Embodiment 4
The Exhaust valve head material concrete steps prepared containing Ce through low-pressure casting, rolling, thermal treatment are as follows:
(1) prepare burden, the weight alloy percent composition that Exhaust valve head material adopts is: C:0.36%; Si:0.17%; Mo:2.0%; Mn:7.6%; Cr:16.8%; W:0.78%; Ni:2.5%; Ce:0.50%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1650 DEG C, melting 1 hour;
(3) adopt low-pressure casting, the processing condition of low-pressure casting are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times, foundry goods again through roll forming, rolling three times, the deflection of last rolling is 48%;
(4) 1080 DEG C of insulations 1 hour is heated to, quenching;
(5) be heated to 810 DEG C of insulations 3 hours, quenching, obtains Exhaust valve head material.The high-temperature yield strength test result of prepared Exhaust valve head material is as shown in table 1.
Embodiment 5
The Exhaust valve head material concrete steps prepared containing Ce through low-pressure casting, rolling, thermal treatment are as follows:
(1) prepare burden, the weight alloy percent composition that Exhaust valve head material adopts is: C:0.36%; Si:0.25%; Mo:1.65%; Mn:8%; Cr:16%; W:0.77%; Ni:1.5%; Ce:0.80%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1630 DEG C, melting 1.5 hours;
(3) adopt low-pressure casting, the processing condition of low-pressure casting are: mold filling pressure 0.06MPa, and filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times, foundry goods again through roll forming, rolling three times, the deflection of last rolling is 50%;
(4) 1150 DEG C of insulations 1 hour is heated to, quenching;
(5) be heated to 800 DEG C of insulations 3 hours, quenching, obtains Exhaust valve head material.The high-temperature yield strength test result of prepared Exhaust valve head material is as shown in table 1.
The hot strength performance comparison of embodiment 1-5 and 21-4N alloy is as shown in the table, can see that the hot strength performance of material of the present invention is all higher than comparative example.
Table 1
Claims (2)
1., containing a preparation method for the Exhaust valve head material of Ce, it is characterized in that, comprise following processing step:
(1) prepare batching according to alloy component range, mix, wherein, the weight alloy percent composition that this Exhaust valve head material adopts is: C:0.32 ~ 0.40%; Si:0.17 ~ 0.27%; Mo:1.0 ~ 2.0%; Mn:6.5 ~ 8.0%; Cr:15 ~ 18%; W:0.50 ~ 1.0%; Ni:1.5 ~ 2.5%; Ce:0.50 ~ 1.0%; Surplus to be purity be 99.8% Fe, to be the impurity weight percent content in the Fe of 99.8% be described purity: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%;
(2) adopt vacuum induction melting, temperature controls at 1620 ~ 1680 DEG C, melting 1 ~ 1.5 hour;
(3) adopt low-pressure casting, foundry goods, again through roll forming, controls the deflection of last rolling more than 40%;
(4) 1050 ~ 1150 DEG C of insulations 0.5 ~ 1 hour is heated to, quenching;
(5) be heated to 800 ~ 820 DEG C of insulations 3 ~ 4 hours, quenching, obtains Exhaust valve head material.
2. the preparation method of the Exhaust valve head material containing Ce according to claim 1, it is characterized in that, the processing condition of the low-pressure casting described in step (3) are: mold filling pressure 0.06MPa, filling velocity is 50mm/s, fill type supercharging 0.01MPa, dwell time 10s, rolling 3 times.
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