CN110042217A - Nanometer bainite bearing heat treatment method and its bearing obtained - Google Patents
Nanometer bainite bearing heat treatment method and its bearing obtained Download PDFInfo
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- CN110042217A CN110042217A CN201910310337.5A CN201910310337A CN110042217A CN 110042217 A CN110042217 A CN 110042217A CN 201910310337 A CN201910310337 A CN 201910310337A CN 110042217 A CN110042217 A CN 110042217A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention discloses a kind of nanometer of bainite bearing heat treatment method, and method includes: that bearing parts to be processed is carried out austenitizing processing；The surface of water-bath cooling bearing parts to be processed is to the first temperature；Isothermal processes bearing parts to be processed at the second temperature makes bearing parts material to be processed carry out bainite transformation；Wherein, the first temperature is lower than the martensite start temperature of bearing parts material to be processed, and second temperature is higher than the martensite start temperature of bearing parts material to be processed.Bearing made from preceding method is utilized the invention also discloses a kind of.The cooling treatment that bearing parts to be processed is carried out using water-bath, avoids salt-bath method, thereby reduces cost, avoids the pollution to environment.
Description
Technical field
The present invention relates to bearing mnanufacture field, in particular to a kind of nanometer of bainite bearing heat treatment method and its obtained
Bearing.
Background technique
Nanometer bainite bearing is a kind of bainite bearing, has fatigue life height, wear-resisting property excellent, and impact is tough
Property high feature, therefore, nanometer bainite bearing is suitable for shock loading condition.Disclosed nanometer bainite bearing steel in recent years
The patented technology of aspect, either conventional bainite processing or the processing of low-temperature nano bainite, are required to salt-bath method progress
Isothermal processes.
However, salt-bath method needs the salt bath equipment of profession to be handled.Wherein, a certain amount of by being added in fused salt
The crystallization water improves quenching intensity, realizes the rapid cooling of bearing.But this salt bath equipment cost is expensive, can also make to environment
At certain pollution.
Summary of the invention
The purpose of the present invention is to provide a kind of nanometer of bainite bearing heat treatment method and its bearings obtained, avoid
Salt-bath method reduces cost using water-bath cooling, while avoiding the pollution to environment.
Technical scheme is as follows: the present invention discloses a kind of nanometer of bainite bearing heat treatment method, comprising:
Step 1, bearing parts to be processed carries out austenitizing processing: bearing parts to be processed is heated to 810 DEG C -870
DEG C, keep the temperature 0.5h-1h；
Step 2, the surface temperature of bearing parts to be processed described in water-bath cooling: when the bearing parts surface to be processed
When the temperature difference of temperature and the bearing parts center portion to be processed is greater than or equal to 200 DEG C, stop the water-bath, stands described wait locate
Bearing parts is managed to reduce the temperature on the bearing parts surface to be processed and the temperature difference of the bearing parts center portion to be processed；And
And when the temperature difference of the temperature on the bearing parts surface to be processed and the bearing parts center portion to be processed is less than or equal to 50 DEG C
When, continue the water-bath, up to the bearing parts surface to be processed to the first temperature；
Step 3, bearing parts to be processed described in isothermal processes at the second temperature carries out the bearing parts to be processed
Bainite transformation；First temperature be lower than the bearing parts material to be processed martensite start temperature, described second
Temperature is higher than the martensite start temperature of the bearing parts material to be processed；And
Step 4, the bearing parts to be processed described in tempering at 170 DEG C -200 DEG C, to remove the axis to be processed
Hold the structural stress of part material.
It may be preferred that in step 2, the water-bath cooling includes bearing parts to be processed described in multiple water-bath cooling.
It may be preferred that first temperature is 130 DEG C -160 DEG C, the second temperature is 180 DEG C -210 DEG C.
It may be preferred that the circulating water using 40 DEG C -70 DEG C carries out the water-bath.
It may be preferred that in step 3, carrying out bearing zero to be processed described in isothermal processes using cryogenic inert atmosphere furnace
Part.
It may be preferred that in step 3, the bainite content generated in the bearing parts materials microstructure to be processed is
The 50%-70% of the material structure of the bearing parts to be processed.
It may be preferred that in step 3, isothermal time 3h-8h.
On the other hand, nanometer bainite bearing obtained by the above method is used the present invention also provides a kind of.
The invention has the following advantages over the prior art:
The cooling treatment that bearing parts to be processed is carried out using water-bath, avoids salt-bath method, thereby reduces cost, keeps away
The pollution to environment is exempted from.
Further, be first cooled to bearing parts to be processed in cooling procedure and open lower than martensite using water-bath
First temperature of beginning transition temperature so that generating a certain amount of martensite in bearing parts material structure to be processed, and then promotes
Bainitic transformation effectively shortens heat treatment cycle.
Detailed description of the invention
Fig. 1 is nanometer bainite bearing heat treatment method flow chart of the present invention.
Specific embodiment
Since salt bath equipment cost is expensive, certain pollution can be also caused to environment.Based on this, the present invention provides one kind
Nanometer bainite bearing heat treatment method, comprising the following steps:
Step 1, bearing parts to be processed carries out austenitizing processing: bearing parts to be processed is heated to 810 DEG C -870
DEG C, keep the temperature 0.5h-1h；
Step 2, the surface temperature of water-bath cooling bearing parts to be processed: when bearing parts surface to be processed temperature with to
When handling the temperature difference of bearing parts center portion more than or equal to 200 DEG C, stops water-bath, stand bearing parts to be processed to reduce wait locate
Manage the temperature on bearing parts surface and the temperature difference of bearing parts center portion to be processed；And work as the temperature on bearing parts surface to be processed
When being less than or equal to 50 DEG C with the temperature difference of bearing parts center portion to be processed, continue water-bath, until bearing parts surface to be processed is extremely
First temperature；
Step 3, isothermal processes bearing parts to be processed at the second temperature makes bearing parts to be processed carry out bainite and turns
Become；First temperature is lower than the martensite start temperature of bearing parts material to be processed, and second temperature is higher than bearing zero to be processed
The martensite start temperature of part material；And
Step 4, the tempering bearing parts to be processed at 170 DEG C -200 DEG C, to remove bearing parts material to be processed
The structural stress of material.
As can be seen that the embodiment of the present invention carries out the cooling treatment of bearing parts to be processed using water-bath, salt bath is avoided
Salt bath equipment cost is expensive when method uses, to reduce costs, avoids the pollution to environment.
Further, be first cooled to bearing steel to be processed in cooling procedure and start lower than martensite using water-bath
First temperature of transition temperature so that generating a certain amount of martensite in bearing parts material structure to be processed, and then promotes shellfish
Family name's body phase transformation, effectively shortens heat treatment cycle.
To make the above purposes, features and advantages of the invention more obvious and understandable, below to specific reality of the invention
Example is applied to be described in detail.
Referring to Fig.1, one embodiment of the invention provides firstly a kind of nanometer of bainite bearing heat treatment method, comprising:
Step S01: bearing parts to be processed is subjected to austenitizing processing；
Wherein, bearing parts to be processed can be bearing parts finished product or the semi-finished product of bearing parts.In the present embodiment
In, bearing parts is by spheroidizing treated bearing parts that steel ingot obtains after shaping, and bearing parts can
To include bearing inner race, bearing outer ring and rolling element, the raceway of the raceway and bearing outer ring of rolling element and bearing inner race matches.
Specifically, in this step, bearing parts to be processed is heated to 810 DEG C~870 DEG C, keeps the temperature 0.5h~1h, with
Carry out austenitizing processing.
Step S02: the surface of water-bath cooling bearing parts to be processed to the first temperature；
Wherein, the first temperature is less than the martensite start temperature of bearing parts material to be processed.Specifically, the first temperature
Degree can be 130 DEG C~160 DEG C, and in the present embodiment, the first temperature can be 145 DEG C.
The surface of bearing parts to be processed is cooled to the first temperature lower than martensite start temperature, so that wait locate
It manages and generates a certain amount of martensite in bearing parts tissue, and then promote bainitic transformation, effectively shorten heat treatment cycle.
In this step, water-bath cooling processing can specifically include, multiple water-bath cooling bearing parts to be processed, until to
Bearing parts surface is handled to the first temperature.This is because, the cooling velocity of water-bath cooling is high in this step, bearing zero to be processed
The surface of part and center portion can have certain temperature difference, if the temperature difference is too big, may cause bearing parts cracking.Using multiple water-bath
The temperature difference of cold mode, the temperature and center portion that can guarantee bearing parts surface to be processed is maintained at certain range, avoids making
It cracks at bearing parts.
Specifically, temperature and the bearing parts heart to be processed during multiple water-bath, when bearing parts surface to be processed
When the temperature difference in portion is greater than or equal to 200 DEG C, stops water-bath, stand bearing steel to be processed to reduce bearing parts surface to be processed
The temperature difference of temperature and bearing parts center portion to be processed；When the temperature and bearing parts center portion to be processed on bearing parts surface to be processed
Temperature difference when being less than or equal to 50 DEG C, continue water-bath, until bearing parts surface to be processed is to the first temperature.
In the present embodiment, the bearing parts surface to be processed 130 DEG C~160 that multiple water-bath cooling obtains can be made
DEG C, center portion temperature is 200 DEG C~250 DEG C.
Also, in the present embodiment, it is preferred to use 40 DEG C~70 DEG C of circulating water carries out water-bath, and the water temperature of supercooling is avoided to make
At the surface defect of bearing parts to be processed.
Step S03: isothermal processes bearing parts to be processed at the second temperature makes bearing parts to be processed carry out bainite
Transformation.
Wherein, second temperature is greater than the martensite start temperature of bearing parts material to be processed.Specifically, the second temperature
Degree can be 180 DEG C~210 DEG C, and in the present embodiment, second temperature can be 195 DEG C.
In the present embodiment, the isothermal time of isothermal processes bearing parts to be processed is 3h~8h, can be in the present embodiment
5h.For another angle, the bainite content generated in bearing parts material structure to be processed should be made in this step
The 50%~70% of bearing parts material structure to be processed.That is, the isothermal processes of this step, until bearing parts material to be processed
The bainite content of tissue reaches 50%~70%, and then determines corresponding isothermal time according to actual transformation amount.
This step can carry out in cryogenic inert atmosphere furnace.Wherein, inert atmosphere refers to inert gas environment, specifically
Inert gas can be for helium, neon, argon gas, nitrogen etc..
Also, in the present embodiment, further includes or can further include after step S03:
Step S04: the tempering bearing parts to be processed at 170 DEG C~200 DEG C.
By tempering, so that the stress of bearing parts material structure to be processed is effectively eliminated, and can be into one
Stable bearing part material tissue is walked, performance is improved.
For purposes of illustration only, the present invention further provides two specific examples.
Example 1: using a kind of high carbon chromium nanometer bainite bearing steel, and main chemical compositions mass percent is, C:0.92,
Si:1.51, Mn:0.45, Cr:1.42, Mo:0.20.After carrying out spheroidizing processing to bearing steel, it is processed into bearing parts, axis
Hold circle wall thickness 40mm.Then bearing parts is heated to 830 DEG C and keeps the temperature 40 minutes, be put into after keeping the temperature 10s in 70 DEG C of warm water and take
Out, after entering the cooling 6s of water after standing 65s again, surface temperature reaches 135 DEG C, and bearing race is put into 200 DEG C of inert atmosphere
Isothermal processes are carried out in furnace, after keeping the temperature 3.5h, bainite generates content and reaches 50%, cooling is taken out, finally in 175 DEG C of furnace
It keeps the temperature 1h and carries out tempering.By this method processing rear bearing circle surface hardness be 62.5HRC, centre hardness 58.6HRC,
Non-notch impact flexibility is 68J/cm2。
Example 2: a kind of carburizing nanometer bainite bearing is used, main chemical compositions mass percent is C:0.23, Si:
1.46, Mn:0.62, Cr:1.56, Ni:0.59, Mo:0.25.Bearing steel is processed into bearing parts, bearing race wall thickness 85mm.So
After carry out Carburization Treatment, the C content of carburizing rear surface reaches 0.95wt.%.Bearing parts after carburizing is subjected to nodularization high temperature
Tempering.Then bearing parts is heated to 865 DEG C and keeps the temperature 60 minutes, be put into after keeping the temperature 25s in 50 DEG C of warm water and take out, stand
After entering the cooling 10s of water after 100s again, surface temperature reaches 155 DEG C, bearing race is put into 185 DEG C of inert atmosphere furnace into
Row isothermal processes, after keeping the temperature 7.5h, bainite production quantity reaches 65%, takes out cooling, finally kept the temperature in 180 DEG C of furnace 1h into
Row tempering.It is 61.5HRC, centre hardness 41.6HRC by this method processing rear bearing circle surface hardness, center portion is U-shaped
Notch impact toughness is 112J/cm2。
In the present embodiment, the cooling treatment of bearing parts to be processed is carried out using water-bath, avoids salt-bath method, and then drop
Low cost, avoids the pollution to environment.
Further, be first cooled to bearing parts to be processed in cooling procedure and open less than martensite using water-bath
First temperature of beginning transition temperature so that generating a certain amount of martensite in bearing parts material structure to be processed, and then promotes
Bainitic transformation effectively shortens heat treatment cycle.
In an alternative embodiment of the invention, a kind of nanometer of bainite bearing, the part of nanometer bainite bearing are additionally provided
It is obtained using method described in above-described embodiment.Bearing parts can be formed using forming method described in previous embodiment,
The specific descriptions of the bearing parts described in the present embodiment can refer to the corresponding description in previous embodiment, and details are not described herein.
It should be noted that in the present invention, in specific numberical range, endpoint value is also included in the scope of the present invention
Within.Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this hair
It in bright spirit and scope, can make various changes or modifications, therefore protection scope of the present invention should be limited with claim
Subject to fixed range.
Claims (8)
1. a kind of nanometer of bainite bearing heat treatment method, which comprises the following steps:
Step 1, bearing parts to be processed carries out austenitizing processing: bearing parts to be processed being heated to 810 DEG C -870 DEG C, is protected
Warm 0.5h-1h；
Step 2, the surface temperature of bearing parts to be processed described in water-bath cooling: when the temperature on the bearing parts surface to be processed
When being greater than or equal to 200 DEG C with the temperature difference of the bearing parts center portion to be processed, stop the water-bath, stands the axis to be processed
Part is held to reduce the temperature difference of the temperature on the bearing parts surface to be processed Yu the bearing parts center portion to be processed；And work as
When the temperature difference of the temperature on the bearing parts surface to be processed and the bearing parts center portion to be processed is less than or equal to 50 DEG C, after
Continue the water-bath, up to the bearing parts surface to be processed to the first temperature；
Step 3, bearing parts to be processed described in isothermal processes at the second temperature makes the bearing parts to be processed carry out bayesian
Body transformation；First temperature is lower than the martensite start temperature of the bearing parts material to be processed, the second temperature
Higher than the martensite start temperature of the bearing parts material to be processed；And
Step 4, the bearing parts to be processed described in tempering at 170 DEG C -200 DEG C, to remove the bearing to be processed zero
Part materials microstructure stress.
2. according to claim 1 nanometer of bainite bearing heat treatment method, which is characterized in that in step 2, the water
Cooling bath includes bearing parts to be processed described in multiple water-bath cooling.
3. according to claim 1 nanometer of bainite bearing heat treatment method, which is characterized in that first temperature is
130 DEG C -160 DEG C, the second temperature is 180 DEG C -210 DEG C.
4. according to claim 1 or nanometer bainite bearing heat treatment method described in 3, which is characterized in that use 40 DEG C -70
DEG C circulating water carry out the water-bath.
5. according to claim 1 nanometer of bainite bearing heat treatment method, which is characterized in that in step 3, use is low
Warm inert atmosphere furnace carries out bearing parts to be processed described in isothermal processes.
6. according to claim 1 nanometer of bainite bearing heat treatment method, which is characterized in that in step 3, it is described to
Handle the 50%- for the material structure that the bainite content generated in bearing parts materials microstructure is the bearing parts to be processed
70%.
7. according to claim 1 nanometer of bainite bearing heat treatment method, which is characterized in that in step 3, when isothermal
Between be 3h-8h.
8. a kind of nanometer of bainite bearing, which is characterized in that use described in any item nanometers of bainite bearings of claim 1-7
Bearing made from heat treatment method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910310337.5A CN110042217B (en) | 2019-04-17 | 2019-04-17 | Nano bainite bearing heat treatment method and bearing manufactured by same |
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| CN201910310337.5A CN110042217B (en) | 2019-04-17 | 2019-04-17 | Nano bainite bearing heat treatment method and bearing manufactured by same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961811A (en) * | 2020-09-04 | 2020-11-20 | 燕山大学 | Method for preparing impact-resistant steel part by using phase change speed difference |
| CN113337694A (en) * | 2021-06-30 | 2021-09-03 | 临清市同兴轴承锻造有限公司 | Spheroidizing annealing heat treatment method for ultrahigh-carbon bearing steel |
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| CN111961811B (en) * | 2020-09-04 | 2022-05-24 | 燕山大学 | Method for preparing impact-resistant steel part by using phase change speed difference |
| CN113337694A (en) * | 2021-06-30 | 2021-09-03 | 临清市同兴轴承锻造有限公司 | Spheroidizing annealing heat treatment method for ultrahigh-carbon bearing steel |
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| CN110042217B (en) | 2020-10-09 |
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