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What are the purposes of heat treatment processes?
- Nov 30, 2018 -

LUOYANG SOPHIA HEAVY MACHINERY CO.,LTD https://www.lyshmac.com/

1.Annealing

 Objective: 1. Reduce hardness, improve plasticity, improve cutting and pressure processing performance; 2. Refine grain, improve mechanical properties, prepare for the next step; 3. Eliminate internal stress generated by cold and hot processing.

2. Normalizing

Objective: 1. Reduce hardness, improve plasticity, improve cutting and pressure processing performance; 2. Refine grain, improve mechanical properties, prepare for the next step; 3. Eliminate internal stress generated by cold and hot processing.

3. Quenching

Purpose: Improve wear resistance and corrosion resistance

4. tempering

1. Reduce or eliminate the internal stress after quenching, reduce the deformation and cracking of the workpiece; 2. Adjust the hardness, improve the plasticity and toughness, obtain the mechanical properties required for the work; 3. Stabilize the workpiece size.

5. Tempering

Objective: 1. Improve the cutting performance and improve the smoothness of the machined surface; 2. Reduce the deformation and cracking during quenching; 3. Obtain good comprehensive mechanical properties.

6. Timeliness

Purpose: 1. Stabilize the microstructure of the steel after quenching, reduce the deformation during storage or use; 2. Reduce the internal stress after quenching and grinding, and stabilize the shape and size.

 

7. Cooling treatment

Purpose: 1. Reducing all or most of the retained austenite in the hardened steel to martensite, thereby increasing the hardness, strength, wear resistance and fatigue limit of the steel; Stabilize the structure of the steel to stabilize the shape and size of the steel.

8. Surface hardening

Objective: To improve the surface hardness, wear resistance and fatigue strength of steel parts, and the core still maintains a tough state.

9. Carburizing, nitrogen

Objective: To improve the surface hardness, wear resistance and fatigue strength of steel parts, and maintain the toughness of the heart.