CN103849721A - Control method and detection method of temper brittleness breakage of 65Mn steel lock sheet - Google Patents
Control method and detection method of temper brittleness breakage of 65Mn steel lock sheet Download PDFInfo
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- CN103849721A CN103849721A CN201410123704.8A CN201410123704A CN103849721A CN 103849721 A CN103849721 A CN 103849721A CN 201410123704 A CN201410123704 A CN 201410123704A CN 103849721 A CN103849721 A CN 103849721A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 91
- 238000001816 cooling Methods 0.000 claims abstract description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 abstract description 13
- 230000000171 quenching effect Effects 0.000 abstract description 13
- 238000007669 thermal treatment Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004154 testing of material Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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Abstract
The invention discloses a control method of temper brittleness breakage of a 65Mn steel lock sheet. The control method comprises the steps: raising the temperature of the 65Mn steel lock sheet to 830 DEG C, oil-cooling and quenching after insulating for 30 min; and placing the 65Mn steel lock sheet in a tempering furnace, and oil-cooling after raising temperature, insulating and tempering, wherein the raising and tempering temperature is 380-420 DEG C, and the tempering and insulating time is 120 min. According to the control method of temper brittleness breakage of the 65Mn steel lock sheet, through increasing the tempering temperature to 380-420 DEG C and prolonging the tempering and insulating time to be 120 min, the temper brittleness breakage of the 65Mn steel lock sheet can be effectively prevented, further the product hardness, elasticity and flexibility are ensured, the 65Mn steel lock sheet is prevented from being invalid, the quality stability of the 65Mn steel lock sheet is ensured, and the safety of an automobile is improved. According to a detection method of the temper brittleness breakage of the 65Mn steel lock sheet, the quality of the 65Mn steel lock sheet is ensured through detection, and the safety of the automobile is improved.
Description
Technical field
The present invention relates to component field of quality control on automobile chassis, be specifically related to control method and the detection method of the 65Mn steel locking plate temper brittleness fracture on automobile chassis.
Background technology
65Mn steel locking plate is the important safety structural part on automobile chassis, is for assembling shifting drag-line, when work, except being under pressure, also has alternation shifting power, therefore requires it to have certain degree of hardness, elasticity and toughness; For this reason, hardness technical requirements is 436～525HV, and microstructure requires as tempering troostite.Its main production process is stamping-830 ℃ insulation 30 minutes, oil quenchinng-320 ℃～360 ℃, the processing of 60 minutes tempering-surface galvanizing of insulation; Produce according to this thermal treatment process, there is fracture failure phenomenon in batches in 65Mn steel locking plate in assembling process.Once fracture appears in locking plate, drag-line is fixed tight or is lost fixed action, will cause hanging the quality problems that do not perform.
The patent No. is 201010112924.2 Chinese patent literature, the elastomeric heat treating method of a kind of 65Mn steel-made electronic scale sensor is disclosed, it is to complete thermal treatment on a thermal treatment tinuous production, concrete steps are as follows: after 1) 65Mn steel-made electronic scale sensor elastomerics impact briquetting material being heated to 830 ℃, be incubated after 15～30 minutes, 5 minutes Cooling Quenching in 100 ℃ of deep fats, clean again, dry up; 2) then 400 ℃ of heating and thermal insulations tempering in 80 minutes; 3) after tempering, adopt water-cooled cooling fast, dry, check product.Due to 65Mn steel locking plate (thickness 1.5mm) thinner thickness, this heat treating method cannot be useful on 65Mn steel locking plate; The quality of corresponding product does not have the concrete method of inspection to verify simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide one can guarantee product hardness, elasticity and toughness, control steel locking plate temper brittleness crack conditions and occur, and can verify control method and the detection method of the 65Mn steel locking plate temper brittleness fracture of steel locking plate quality.
To achieve these goals, the technical solution used in the present invention is:
The control method of this 65Mn steel locking plate temper brittleness fracture, is warming up to 830 ℃ by 65Mn steel locking plate, is incubated after 30 minutes oil quenchinng; Again 65Mn steel locking plate is put into tempering stove, after heating and heat preservation tempering, oil cooling is cooling; Intensification tempering temperature is 380 ℃～420 ℃, and tempering insulation time is 120 minutes.
As preferred version, intensification tempering temperature is 420 ℃.
Further, in tempering stove furnace temperature everywhere the temperature difference be controlled at ± 10 ℃.
Further, after the oil quenchinng of 65Mn steel locking plate, in 12 hours, pack heating and heat preservation tempering in tempering stove into.
Further, the tempering troostite that 65Mn steel locking plate microstructure is uniform and delicate.
A detection method for 65Mn steel locking plate temper brittleness fracture, comprises the following steps:
A, bending sampling, by the bending of 65Mn steel locking plate and in the sampling of bending incision position;
B, sample clean, and sample is put into beaker, pour alcohol into or acetone cleans up in Ultrasonic Cleaners in beaker;
C, sample are observed, and use scanning electron microscope, and sample is according to the observation selected voltage and magnification, after focusing is clear, and the preservation of taking pictures; At electric Microscopic observation locking plate fracture, as its microscopic appearance has visible along crystalline substance, for along brilliant brittle rupture, after being described, locking plate tempering there is temper brittleness; As fracture microscopic appearance is normal dimple, after being described, locking plate tempering there is not temper brittleness.
Further, when sample cleans, pour alcohol in beaker or the amount of acetone into and exceed sample surfaces 10mm.
Further, scanning electron microscope magnification is 1600～2000.
The invention has the advantages that: the control method of this 65Mn steel locking plate temper brittleness fracture, by improving tempering temperature to 380 ℃～420 ℃, tempering insulation time is extended for 120 minutes, can effectively avoid the generation of 65Mn steel locking plate temper brittleness crack conditions, and then product hardness, elasticity and toughness are guaranteed, prevent product failure, ensure product quality stability, improve the security of automobile.
The detection method of this 65Mn steel locking plate temper brittleness fracture, adopt the mode of artificial cripping test+fracture analysis, at electric Microscopic observation fracture microscopic appearance, determine breaking property type, the qualitative temper brittleness quality problems that can't find locking plate after thermal treatment in the conventional hardness of 65Mn steel locking plate and the metallographic structure testing of materials that solved, thereby guarantee quality product, improved the security of automobile.
Accompanying drawing explanation
Mark in content and the figure below each width accompanying drawing of specification sheets of the present invention being expressed is briefly described:
Fig. 1 is the 65Mn steel locking plate fracture fracture apperance schematic diagram that the embodiment of the present invention 1 obtains.
Fig. 2 is the 65Mn steel locking plate fracture fracture apperance schematic diagram that the embodiment of the present invention 4 obtains.
Fig. 3 is the 65Mn steel locking plate fracture fracture apperance schematic diagram that the embodiment of the present invention 5 obtains.
Fig. 4 is the 65Mn steel locking plate fracture fracture apperance schematic diagram that the embodiment of the present invention 7 obtains.
Fig. 5 is the 65Mn steel locking plate internal microstructure figure that the control method of 65Mn steel locking plate temper brittleness fracture of the present invention obtains.
Fig. 6 is the 65Mn steel locking plate internal microstructure figure that in prior art, technique makes.
Fig. 7 is the tempering process graphic representation of the control method of 65Mn steel locking plate temper brittleness fracture of the present invention.
Fig. 8 is prior art 65Mn steel locking plate tempering process graphic representation.
Embodiment
Contrast accompanying drawing below, by the description to optimum embodiment, the specific embodiment of the present invention is described in further detail.
The control method of this 65Mn steel locking plate temper brittleness fracture, is warming up to 830 ℃ by 65Mn steel locking plate, is incubated after 30 minutes oil quenchinng; Again 65Mn steel locking plate is put into tempering stove, after heating and heat preservation tempering, oil cooling is cooling; Intensification tempering temperature is 380 ℃～420 ℃, and tempering insulation time is 120 minutes.
As preferred version, intensification tempering temperature is 420 ℃.
In tempering stove furnace temperature everywhere the temperature difference be controlled at ± 10 ℃.
After the oil quenchinng of 65Mn steel locking plate, in 12 hours, pack heating and heat preservation tempering in tempering stove into.
The tempering troostite that 65Mn steel locking plate microstructure is uniform and delicate.
A detection method for 65Mn steel locking plate temper brittleness fracture, comprises the following steps:
A, sampling, adopt artificial bending mode to bend locking plate, and then, in the sampling of 65Mn steel locking plate bending incision position, height of specimen is 10～15mm;
B, sample clean, and sample is put into beaker, pour alcohol or acetone into and in Ultrasonic Cleaners, clean 10 minutes, once do not wash clean clearly and again clean 10 minutes, until clean up;
C, sample are observed, and use scanning electron microscope, and sample is according to the observation selected voltage and magnification, after focusing is clear, and the preservation of taking pictures; At electric Microscopic observation locking plate fracture, as its microscopic appearance has visible along crystalline substance, for along brilliant brittle rupture, after being described, locking plate tempering there is temper brittleness; As fracture microscopic appearance is normal dimple, after being described, locking plate tempering there is not temper brittleness.
Further, when sample cleans, pour alcohol in beaker or the amount of acetone into and exceed sample surfaces 10mm.
Further, scanning electron microscope magnification is 1600～2000.
Embodiment by multiple tempering temperature control to be to verify the experimental result of control method of this 65Mn steel locking plate temper brittleness fracture, and technological test result carried out to temper brittleness experiment and detect, and concrete data see the following form.
Table 1 is the tempering experimental result of 65Mn steel locking plate
| Embodiment | Thermal treatment process | Cripping test | Fracture apperance |
| Embodiment 1 | 830 ± 10 ℃ of oil quenching+250 ℃ tempering | More crisp | Dimple+edge is brilliant, sees accompanying drawing 1 |
| |
830 ± 10 ℃ of oil quenching+280 ℃ tempering | More crisp | Dimple+edge is brilliant |
| Embodiment 3 | 830 ± 10 ℃ of oil quenching+310 ℃ tempering | Crisp | Substantially be along brilliant |
| Embodiment 4 | 830 ± 10 ℃ of oil quenching+340 ℃ tempering | Crisp | Basic is along brilliant, sees accompanying |
| Embodiment 5 | 830 ± 10 ℃ of oil quenching+370 ℃ tempering | More crisp | Along brilliant+a small amount of dimple, see accompanying drawing 3 |
| Embodiment 6 | 830 ± 10 ℃ of oil quenching+380 ℃ tempering | Toughness is better | Basic is dimple |
| Embodiment 7 | 830 ± 10 ℃ of oil quenching+400 ℃ tempering | Toughness is better | Obviously dimple, is shown in accompanying drawing 4 |
| Embodiment 8 | 830 ± 10 ℃ of oil quenching+420 ℃ tempering | Good toughness | Obviously |
| Embodiment | |||
| 9 | ℃ tempering of ℃ tempering+280, inefficacy part+420 | Toughness is better | Obviously dimple |
By the sample fracture analysis discovery of the different backfire tests of table 1,250 ℃ is the beginning temperature that first kind temper brittleness appears in 65Mn steel.
Along with the rising of tempering temperature, in fracture apperance, dimple ratio obviously reduces, and constantly increases along brilliant ratio; 310 ℃～340 ℃ fracture apperances are substantially along brilliant feature, and now temper brittleness is the most obvious.
Along with tempering temperature further raises, toughness starts to recover, and the sample fracture of 380 ℃ of tempering is normal dimple, and obvious dimple appears in 400 ℃ of tempering; Illustrate that 380 ℃ is to control the ceiling temperature that first kind temper brittleness appears in 65Mn steel.
Last group technological test in table 1, ℃ tempering of ℃ tempering+280, inefficacy part+420, shows to carry out tempering again in temper brittleness district, does not occur reversible temper brittleness, and this has verified that locking plate fracture is that first kind temper brittleness causes.This class temper brittleness all there will be in carbon steel and steel alloy, and the cold speed of going after it and tempering is irrelevant, even if rapid cooling or reheat to tempering in this temperature range after tempering all cannot be avoided.
Occurring, after such temper brittleness, being heated higher temperature tempering, temper brittleness can be eliminated, impact toughness is raise again.If now in the temperature range of 250～400 ℃, tempering will no longer produce this temper brittleness again.
Verify by test experience, tempering insulation time is 120 minutes, and intensification tempering temperature is in the time of 380 ℃～420 ℃, and locking plate toughness is better, does not have temper brittleness after locking plate tempering.420 ℃ time,, there is not temper brittleness in locking plate good toughness after locking plate tempering.
Be illustrated in figure 7 the new heat treatment cycle curve of 65Mn steel locking plate, 65Mn steel locking plate is according to new heat treatment cycle curve, heat-treat tempering: A, thermal treatment tempering stove are prepared, check heat treatment furnace and utility appliance, as whether power supply system, air cycle be normal with fan, whether automatic instrument(s) and thermopair on position be normal, qualified; Check under normal operation, furnace temperature everywhere the temperature difference whether in specialized range (as ± 10 ℃).B, shove charge, after quenching locking plate to test according to the rules qualified after, and in time shove charge (can not exceed 12 hours to entering heat treatment furnace after customary quenching), stacks neatly batch while controlling tempering well according to locking plate shape.C, heating and insulation in the time that power transmission heats, should be started fan and temperature control instrument simultaneously; Be heated to (as 400 ℃) after specified temperature, according to the rules time insulation (as 120 minutes); Answer correction of timing work area temperature in soaking time.D, heat-treat when operation, operator is splashed temperature and equipment for Heating Processing running condition, carries out 65Mn steel locking plate tempering source recording.
Analyze by the problem that 65Mn steel locking plate in prior art was lost efficacy, due to 320 ℃～360 ℃ of locking plate tempering heat treatment temperature, be incubated tempering in 60 minutes, the temperature of the first kind temper brittleness that this humidity province and 65Mn steel produce conventionally overlaps at 200～350 ℃.So locking plate produces first kind temper brittleness most probably, cause locking plate one side under assembling External Force Acting, to occur along brilliant temper brittleness fracture.Conventionally, after quenching, form martensitic Industrial Steels and all can produce first kind temper brittleness.65Mn steel locking plate part carries out tempering in this tempering region, because the ε-FexC type carbide in steel changes gradually θ-Fe at this temperature
3c or Fe
5c
2type carbide, these newly-generated carbide are separated out by the border of the lath along lath martensite, bundle or on martensitic twin band and crystal boundary, thereby cause the toughness of steel obviously to decline; It is 65Mn steel that inefficacy locking plate adopts material, Cr, Mn element contained in this steel have promoter action to the generation of first kind temper brittleness, and the elements such as Si, Cr will make in embrittlement temperature district to move in promoter action, these are all immanent causes that workpiece produces temper brittleness.
Because 65Mn steel inefficacy locking plate is that first kind temper brittleness causes.If can guarantee under the prerequisite of technical requirements, avoid the humidity province of 65Mn steel first kind temper brittleness generation and carry out tempering, can effectively solve locking plate assembling and occur phenomenon of rupture.Tempering temperature further improves, holding time, laminar θ-Fe
3c or Fe
5c
2type carbide becomes granular carbide by breaking, assemble, growing up, therefore temper brittleness is declined, impelling strength raises.
Be illustrated in figure 8 the former heat treatment cycle curve of 65Mn steel locking plate, 65Mn steel locking plate is produced according to former thermal treatment process, assembling occurs that the locking plate analysis of fracture is: hardness actual measurement is that 508.2HV, 510.2HV(locking plate design requirements hardness are 436～525HV), technical requirements conforms with the regulations; Microstructure is thinner tempering troostite, sees accompanying drawing 6, and microstructure is normal.Locking plate fracture to fracture detects analysis: A, sampling, samples height of specimen 10～15mm near locking plate fracture; B, sample clean, and sample is put into beaker, pour alcohol or acetone (amount of alcohol or acetone of pouring into is to exceed specimen surface 10mm) into and in Ultrasonic Cleaners, clean approximately 10 minutes, as once do not washed clean clearly and can again clean, until clean up; C, sample are observed, and carry out according to scanning electron microscope working specification, and sample is according to the observation selected suitable voltage (25KV) and magnification (1600～2000), focuses on clear, the preservation of taking pictures.There is visible along crystalline substance at electric its microscopic appearance of Microscopic observation fracture, for along brilliant brittle rupture, illustrate after locking plate tempering is according to former thermal treatment process tempering and have temper brittleness; Because locking plate itself exists temper brittleness, under assembling External Force Acting, occur along brilliant brittle rupture.
The locking plate of producing according to heat treatment cycle curve new after improving, hardness test is 469.9HV, 462.9HV, technical requirements conforms with the regulations; Microstructure is uniform and delicate tempering troostite, microstructure is normal, see Fig. 5, locking plate (thickness 1.5mm) is manually bent, detection method according to the fracture of 65Mn steel locking plate temper brittleness detects analysis to fracture, fracture is normal dimple, does not have temper brittleness after locking plate tempering is described.
65Mn steel locking plate tempering temperature is limited in to 380 ℃～420 ℃, and tempering time is limited in 120 minutes; After improved new thermal treatment process is implemented, according to on-the-spot individual and testing staff's reflection, there is not phenomenon of rupture after assembling in locking plate again, and property indices all meets service requirements, guaranteed quality product.
The present invention proposes a kind of new thermal treatment process of the 65Mn of control steel locking plate temper brittleness fracture, and propose with artificial cripping test+fracture analysis, at electric Microscopic observation fracture microscopic appearance, determine breaking property type, the qualitative temper brittleness quality problems that can't find locking plate after thermal treatment in the conventional hardness of 65Mn steel locking plate and the metallographic structure testing of materials that solved, thereby guarantee quality product, improved the security of automobile.
Obviously specific implementation of the present invention is not subject to the restrictions described above, as long as adopted the improvement of the various unsubstantialities that method design of the present invention and technical scheme carry out, all within protection scope of the present invention.
Claims (8)
- The control method of 1.65Mn steel locking plate temper brittleness fracture, is warming up to 830 ℃ by 65Mn steel locking plate, is incubated after 30 minutes oil quenchinng; Again 65Mn steel locking plate is put into tempering stove, after heating and heat preservation tempering, oil cooling is cooling; It is characterized in that: intensification tempering temperature is 380 ℃～420 ℃, and tempering insulation time is 120 minutes.
- 2. the control method of 65Mn steel locking plate temper brittleness fracture as claimed in claim 1, is characterized in that: intensification tempering temperature is 420 ℃.
- 3. the control method of 65Mn steel locking plate temper brittleness as claimed in claim 1 fracture, is characterized in that: in tempering stove furnace temperature everywhere the temperature difference be controlled at ± 10 ℃.
- 4. the control method of 65Mn steel locking plate temper brittleness fracture as claimed in claim 1, is characterized in that: after the oil quenchinng of 65Mn steel locking plate, pack heating and heat preservation tempering in tempering stove in 12 hours into.
- 5. the control method of 65Mn steel locking plate temper brittleness fracture as claimed in claim 1, is characterized in that: the tempering troostite that 65Mn steel locking plate microstructure is uniform and delicate.
- 6. a detection method for 65Mn steel locking plate temper brittleness fracture claimed in claim 1, is characterized in that:A, bending sampling, by the bending of 65Mn steel locking plate and in the sampling of bending incision position;B, sample clean, and sample is put into beaker, pour alcohol into or acetone cleans up in Ultrasonic Cleaners in beaker;C, sample are observed, and use scanning electron microscope, and sample is according to the observation selected voltage and magnification, after focusing is clear, and the preservation of taking pictures; At electric Microscopic observation locking plate fracture, as its microscopic appearance has visible along crystalline substance, for along brilliant brittle rupture, after being described, locking plate tempering there is temper brittleness; As fracture microscopic appearance is normal dimple, after being described, locking plate tempering there is not temper brittleness.
- 7. the detection method of 65Mn steel locking plate temper brittleness as claimed in claim 6 fracture, is characterized in that: when sample cleans, pour alcohol in beaker or the amount of acetone into and exceed sample surfaces 10mm.
- 8. the detection method of 65Mn steel locking plate temper brittleness fracture as claimed in claim 7, is characterized in that: scanning electron microscope magnification is 1600～2000.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369226A (en) * | 2022-08-25 | 2022-11-22 | 奇瑞汽车股份有限公司 | Method for improving quality of hair cover locking hook and hair cover locking hook manufactured by method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214370A (en) * | 1997-10-15 | 1999-04-21 | 胥立华 | Heat treatment process for cutter body for stone processing |
| CN101294240A (en) * | 2007-04-23 | 2008-10-29 | 印辉 | Thermal treatment method for mounting frame for air conditioner motor |
| CN101775473A (en) * | 2010-02-09 | 2010-07-14 | 广东工业大学 | Method for heat treatment of 65Mn steel-made electronic scale sensor elastic body |
| CN102589950A (en) * | 2012-03-02 | 2012-07-18 | 西安石油大学 | Preparation technology of sample of scanning electron microscope for observing crack growth path |
| CN103194588A (en) * | 2013-01-07 | 2013-07-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Heat treatment process for 65Mn spring washer |
-
2014
- 2014-03-27 CN CN201410123704.8A patent/CN103849721A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214370A (en) * | 1997-10-15 | 1999-04-21 | 胥立华 | Heat treatment process for cutter body for stone processing |
| CN101294240A (en) * | 2007-04-23 | 2008-10-29 | 印辉 | Thermal treatment method for mounting frame for air conditioner motor |
| CN101775473A (en) * | 2010-02-09 | 2010-07-14 | 广东工业大学 | Method for heat treatment of 65Mn steel-made electronic scale sensor elastic body |
| CN102589950A (en) * | 2012-03-02 | 2012-07-18 | 西安石油大学 | Preparation technology of sample of scanning electron microscope for observing crack growth path |
| CN103194588A (en) * | 2013-01-07 | 2013-07-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Heat treatment process for 65Mn spring washer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369226A (en) * | 2022-08-25 | 2022-11-22 | 奇瑞汽车股份有限公司 | Method for improving quality of hair cover locking hook and hair cover locking hook manufactured by method |
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Application publication date: 20140611 |