CN102864292A - Heat treatment process for strengthening and toughening GCr15 knife roller - Google Patents
Heat treatment process for strengthening and toughening GCr15 knife roller Download PDFInfo
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- CN102864292A CN102864292A CN2011101868107A CN201110186810A CN102864292A CN 102864292 A CN102864292 A CN 102864292A CN 2011101868107 A CN2011101868107 A CN 2011101868107A CN 201110186810 A CN201110186810 A CN 201110186810A CN 102864292 A CN102864292 A CN 102864292A
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Abstract
The invention relates to a heat treatment process for strengthening and toughening a GCr15 knife roller, comprising the following steps: (1) solution treatment: putting a workpiece in a furnace and heating up to 690-700 DEG C, preserving the heat for 1h, then heating up to 1030-1050 DEG C, and carrying out oil cooling on the workpiece; (2) high temperature tempering: heating up the workpiece obtained by the step (1) to 680-700 DEG C, preserving the heat for 2h, and then conducting air cooling; (3) quenching: after processing, heating up the workpiece to 840-860 DEG C, preserving the heat for 1.5h, and then conducting oil cooling; and (4) low temperature tempering: heating up to 240-260 DEG C, preserving the heat for 2-3h, and then conducing air cooling; wherein preferably the workpiece in the step (3) is firstly heated up to 700 DEG C and is subject to heat preservation for 1h, and then is heated up to 840-860 DEG C. Compared with the prior art, by adopting cosuperfine processing method of carbides in the method, the material structure is improved, and the strength and toughness of the material are raised; the wear resistance of the processed knife roller is raised by 7times, the impact toughness is raised by 2 times, and the service life is prolonged by 2-4 times, thus the processed knife roller completely reaches to the level of an imported knife roller.
Description
Technical field
The present invention relates to a kind of thermal treatment process, relate in particular to GCr15 rotor highly malleablized thermal treatment process.
Background technology
Material is that the cut-out rotor of GCr15 is the important accessory of certain imported mechanical equipment, and conventional GCr15 heat treatment quenching process is: workpiece is heated to 850 ℃, is incubated the oil cooling of coming out of the stove after 0.5 hour; Carry out immediately deepfreeze after being as cold as room temperature, take out after 2 hours-70 ℃ of insulations; Workpiece is heated to 250 ℃, is incubated the air cooling of coming out of the stove after 2～3 hours.After thermal treatment process was processed routinely, the hardness of rotor reached 60～63HRC, yet often deforms and the brittle failure of ftractureing, and obdurability is not enough, and work-ing life is shorter, and heat treatment performance does not reach requirement.
Summary of the invention
Defectives such as purpose of the present invention is exactly for after overcoming conventional GCr15 heat-treatment quenching, workpiece obdurability deficiency and a kind of GCr15 rotor highly malleablized thermal treatment process is provided improve the work-ing life of rotor.
Purpose of the present invention can be achieved through the following technical solutions: a kind of GCr15 rotor highly malleablized thermal treatment process, and this technique may further comprise the steps,
(1) solid solution: workpiece advances stove and is heated to 690～700 ℃ of insulations and is warming up to 1040 ± 10 ℃ of insulations 1 hour, immediately workpiece oil cooling after 1 hour again;
(2) high tempering: the solid solution workpiece is heated to 690 ± 10 ℃ of insulations 2 hours, air cooling;
(3) quench: workpiece is warming up to 850 ± 10 ℃ after the processing, is incubated 1.5 hours, then oil cooling;
(4) low-temperaturetempering: be heated to 250 ± 10 ℃ the insulation 2～3 hours after air cooling.
Preferably, described in the described step (3) after the processing workpiece be heated to first 700 ℃ of insulations to be warming up to again 850 ± 10 ℃ in 1 hour, be incubated 1.5 hours, follow oil cooling.
Preferably, workpiece is to be heated to 700 ℃ of insulations into stove to be warming up to 1040 ± 10 ℃ of insulations 1 hour, immediately workpiece oil cooling after 1 hour again in the described step (1).
Preferably, the equipment for Heating Processing of described GCr15 rotor highly malleablized thermal treatment process employing is mult-purpose chamber furnace.
Compared with prior art, beneficial effect of the present invention is: adopt the carbide superfining treatment process, improved material structure, improved the obdurability of material; Cut-out rotor wear resistance with art breading of the present invention improves 7 times, and impelling strength improves 2 times, improves 2-4 work-ing life doubly, reaches the level of import rotor fully.
Description of drawings
Fig. 1 is rotor outside view of the present invention;
Fig. 2 is thermal treatment process figure of the present invention;
Fig. 3 is heat treated carbon compound particle distribution curve figure of the present invention;
Fig. 4 is conventional heat treated carbon compound particle distribution curve figure.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
Material is the cut-out rotor of GCr15, its profile as shown in Figure 1, this rotor single-piece weight 100kg, every stove fills 8.The equipment for Heating Processing that adopts is mult-purpose chamber furnace, heating power: 120KW.Working spaces's size: 1500 * 750 * 750mm.The highly malleablized thermal treatment process of GCr15 rotor, carry out according to the following step:
(1) solid solution: workpiece advances stove and is heated to 690 ℃ of insulations and is warming up to 1030 ℃ of insulations 1 hour after 1 hour again, and all carbide all dissolve in the austenite, and make the carbide composition homogenizing, and the workpiece oil cooling obtains oversaturated martensite immediately;
(2) high tempering: the solid solution workpiece is heated to 2 hours air coolings of 680 ℃ of insulations, changes sorbite into, and carbide is spherical distribution.
(3) quench: workpiece is warming up to 840 ℃ after the processing, is incubated 1.5 hours, and structural transformation becomes austenite, and the carbide particle of some amount is retained.Then oil cooling is transformed into martensite.
(4) low-temperaturetempering: be heated to 240 ℃ the insulation 2 hours after air cooling.Quenched martensite changes tempered martensite into, and what obtain is organized as the tiny carbide particle of disperse that distributing on the fine acicular martensitic matrix.
Embodiment 2:
The present embodiment is with embodiment 1, and difference is: described in the above-mentioned steps (3) after the processing workpiece be heated to first 700 ℃ of insulations to be warming up to again 840 ℃ in 1 hour, be incubated 1.5 hours, follow oil cooling.Thermal treatment process figure as shown in Figure 2.
Embodiment 3:
The present embodiment is with embodiment 2, and difference is: workpiece advances stove and is heated to 700 ℃ of insulations and is warming up to 1040 ℃ of insulations 1 hour after 1 hour again in the step (1); The solid solution workpiece is heated to 690 ℃ in the step (2); The rear workpiece of processing is to be heated to first 700 ℃ of insulations to be warming up to 850 ℃ in 1 hour again in the step (3), is incubated 1.5 hours; Be heated in the step (4) 250 ℃ the insulation 2.5 hours after air cooling.
Embodiment 4:
The present embodiment is with embodiment 2, and difference is: workpiece advances stove and is heated to 700 ℃ of insulations and is warming up to 1050 ℃ of insulations 1 hour after 1 hour again in the step (1); The solid solution workpiece is heated to 700 ℃ in the step (2); The rear workpiece of processing is to be heated to first 700 ℃ of insulations to be warming up to 860 ℃ in 1 hour again in the step (3), is incubated 1.5 hours; Be heated in the step (4) 260 ℃ the insulation 3 hours after air cooling.
With the GCr15 steel sample after processing in above-described embodiment and the GCr15 steel sample after carrying out conventional thermal treatment carry out following contrast:
1, the contrast of the microstructure after the processing.Two groups of Quantimets on probation amplify 2500 times of inspections, all do not find residual austenite in the tissue.This may be because the higher result of tempering temperature, so after 250 ℃ of tempering, can cancel ice-cold processing, the electronic probe inspection shows, carbon content is about 0.40～0.54% in the quenched martensite, and the interior Residual Carbides amount of microstructure is between 6～8% after quenching.
The carbide particle distribution curve of these two groups of samples is seen Fig. 3 and Fig. 4; More as can be known after ultrafining treatment of the present invention, Carbide size is thin by two figure, and circularity is good, and in the same size is evenly distributed, and after measured, the carbide average particulate diameter is 0.38 μ m.
2, contact fatigue property contrast.Under different stress conditions, the contact fatigue property of GCr15 steel sees the following form:
By learning in the table: if take conventional heat treatment sample life value as 1, the super-refinement life-span then is 2-4 times.The ultrafining treatment life, be since in the microstructure Residual Carbides particle thin, circularity is good, be evenly distributed and martensite in due to the carbon content configuration suitably.
3, wear resisting property contrast.Be W18Cr4V to the mill sample material, size is identical with the sample of working, and comparing result sees the following form:
By the table in as can be known: the GCr15 steel is after different heat treatment, and hardness is all at HRC60-63, but wear resisting property differs greatly.If be decided to be 1 processed conventionally friction durability, then after the ultrafining treatment be 7.3 times, all kinds of GCr15 steel samples all are to mill with the W18Cr4V rapid steel sample of hardness HRC65.Under the same conditions, average weightless 0.00255 gram of ultrafining treatment person, average weightless 0.01800 gram of conventional processing person, W18Cr4V is 0.00284 gram.This explanation, though the GCr15 steel hardness of super-refinement between HRC60-61, and wear resisting property unexpectedly surpasses the W18Cr4V steel of HRC65.
4, impelling strength contrast.After the ultrafining treatment of the present invention, impelling strength also improves significantly, and sees the following form:
5, use result's contrast.We put into production use by the rotor after with ultrafining treatment.As a result, rotor used 41 days, 107 tons of production output, and the new rotor of import used 40-45 days, and output is the 120-135 ton, reaches import rotor level fully with the heat treated domestic cut-out rotor of novel process.
Claims (5)
1. a GCr15 rotor highly malleablized thermal treatment process is characterized in that, described GCr15 rotor highly malleablized thermal treatment process may further comprise the steps:
(1) solid solution: workpiece advances stove and is heated to 690～700 ℃ of insulations and is warming up to 1040 ± 10 ℃ of insulations 1 hour, immediately workpiece oil cooling after 1 hour again;
(2) high tempering: the solid solution workpiece is heated to 690 ± 10 ℃ of insulations 2 hours, air cooling;
(3) quench: workpiece is warming up to 850 ± 10 ℃ after the processing, is incubated 1.5 hours, then oil cooling;
(4) low-temperaturetempering: be heated to 250 ± 10 ℃ the insulation 2～3 hours after air cooling.
2. GCr15 rotor highly malleablized thermal treatment process as claimed in claim 1 is characterized in that, described in the described step (3) after the processing workpiece be heated to first 700 ℃ of insulations to be warming up to again 850 ± 10 ℃ in 1 hour, be incubated 1.5 hours, follow oil cooling.
3. GCr15 rotor highly malleablized thermal treatment process as claimed in claim 1 or 2 is characterized in that, workpiece is to be heated to 700 ℃ of insulations into stove to be warming up to 1040 ± 10 ℃ of insulations 1 hour, immediately workpiece oil cooling after 1 hour again in the described step (1).
4. GCr15 rotor highly malleablized thermal treatment process as claimed in claim 1 or 2 is characterized in that, the equipment for Heating Processing that described GCr15 rotor highly malleablized thermal treatment process adopts is mult-purpose chamber furnace.
5. GCr15 rotor highly malleablized thermal treatment process as claimed in claim 3 is characterized in that, the equipment for Heating Processing that described GCr15 rotor highly malleablized thermal treatment process adopts is mult-purpose chamber furnace.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484619A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method of GCr15 bearing steel |
Citations (1)
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| CN101381843A (en) * | 2008-10-17 | 2009-03-11 | 山西太钢不锈钢股份有限公司 | 5Cr5MoWSiV cold roller and heat treatment method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101381843A (en) * | 2008-10-17 | 2009-03-11 | 山西太钢不锈钢股份有限公司 | 5Cr5MoWSiV cold roller and heat treatment method thereof |
Non-Patent Citations (3)
| Title |
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| 弓自洁 等: "GCr15轴承钢的热处理发展动向", 《金属热处理》, 30 September 1992 (1992-09-30), pages 3 - 6 * |
| 赵宇 等: "GCr15钢碳化物细化处理工艺及对其性能的影响", 《轴承》, 28 February 2006 (2006-02-28), pages 24 - 27 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484619A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method of GCr15 bearing steel |
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Application publication date: 20130109 |