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Composite heat treatment process

A composite heat treatment and process technology, applied in heat treatment equipment, manufacturing tools, quenching agent, etc., can solve problems affecting service life, easy metal residue, multi-processing stress, etc., to prolong service life, improve matrix performance, and improve stability Effect

Inactive Publication Date: 2017-10-20
JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes are connected with each other and cannot be interrupted; in the current metal heat treatment process, the number of heating and tempering is generally small, the heat treatment effect is often not as expected, and the metal tends to retain more processing stress, which directly affects the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a composite heat treatment process, which specifically includes the following steps:

[0032] (1) Primary heating: heat the workpiece to 860°C and keep it warm for 25 minutes;

[0033] (2) Air cooling: use air cooling to accelerate cooling of the workpiece to 450 °C at a cooling rate of 7 °C / s;

[0034] (3) Air cooling: cool the air-cooled workpiece to room temperature;

[0035] (iv) Primary tempering: heat the workpiece to 750°C for 35 minutes, wait for 30s to make the temperature of the workpiece uniform, and then use water cooling to accelerate cooling to 400°C at a cooling rate of 13°C / s, and then air cool to room temperature;

[0036] (5) Secondary heating: heat the workpiece to 620°C and keep it warm for 35 minutes;

[0037] (vi) Water cooling: use water cooling to cool the workpiece to room temperature at a cooling rate of 13°C / s;

[0038] (vii) Secondary tempering: heat the workpiece to 650°C and temper for 55 minutes, then air cool t...

Embodiment 2

[0047] This embodiment provides a composite heat treatment process, which specifically includes the following steps:

[0048] (1) Primary heating: heat the workpiece to 875°C and keep it warm for 30 minutes;

[0049] (2) Air cooling: use air cooling to accelerate cooling of the workpiece to 470 °C at a cooling rate of 9 °C / s;

[0050] (3) Air cooling: cool the air-cooled workpiece to room temperature;

[0051] (iv) One-time tempering: heat the workpiece to 770°C for 40 minutes, wait for 35 seconds to make the temperature of the workpiece uniform, and then use water cooling to accelerate cooling to 430°C at a cooling rate of 15°C / s, and then air cool to room temperature;

[0052] (5) Secondary heating: heat the workpiece to 625°C and keep it warm for 40 minutes;

[0053] (vi) Water cooling: use water cooling to cool the workpiece to room temperature at a cooling rate of 15°C / s;

[0054] (vii) Secondary tempering: heat the workpiece to 675°C and temper for 65 minutes, then ai...

Embodiment 3

[0063] This embodiment provides a composite heat treatment process, which specifically includes the following steps:

[0064] (1) Primary heating: heat the workpiece to 860°C and keep it warm for 28 minutes;

[0065] (2) Air cooling: use air cooling to accelerate cooling of the workpiece to 460 °C at a cooling rate of 8 °C / s;

[0066] (3) Air cooling: cool the air-cooled workpiece to room temperature;

[0067] (iv) Primary tempering: heat the workpiece to 760°C for 38 minutes, wait for 33s to make the temperature of the workpiece uniform, then use water cooling to accelerate cooling to 420°C at a cooling rate of 14°C / s, and then air cool to room temperature;

[0068] (5) Secondary heating: heat the workpiece to 623°C and keep it warm for 36 minutes;

[0069] (vi) Water cooling: use water cooling to cool the workpiece to room temperature at a cooling rate of 14°C / s;

[0070] (vii) Secondary tempering: heat the workpiece to 665°C and temper for 58 minutes, then air cool to ro...

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PUM

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Abstract

The invention relates to a composite heat treatment process, which belongs to the technical field of metal heat treatment. The composite heat treatment process includes the following steps: (1) primary heating, (2) air cooling, (3) air cooling, (4) primary tempering, (5) secondary heating, (6) water cooling, (7) secondary tempering, (8) quenching, (9) take out the workpiece for cleaning, drying, compounding The heat treatment is completed; the composite heat treatment process of the present invention adds a heating step before each tempering, which can well release the residual stress in the workpiece and prolong the service life, and the composite heat treatment process of the present invention uses mist Advanced quenching liquid cooling and water tank water cooling, through two rapid cooling methods, the quenching effect of the workpiece is improved.

Description

technical field [0001] The invention relates to a composite heat treatment process, which belongs to the technical field of metal heat treatment. Background technique [0002] Metal heat treatment is to heat a metal workpiece in a certain medium to a suitable temperature, and keep it at this temperature for a certain period of time, and then cool it in a different medium at different speeds, by changing the surface or internal microstructure of the metal material A process in which the structure is used to control its performance. Thermal treatment process generally comprises heating, insulation, three processes of cooling, has only two processes of heating and cooling sometimes. These processes are connected with each other and cannot be interrupted; in the current metal heat treatment process, the number of heating and tempering is generally small, the heat treatment effect is often not as expected, and the metal tends to retain more processing stress, which directly affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/60
CPCC21D1/18C21D1/60
Inventor 史有森袁彬
Owner JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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