The heat treatment process of starting rod forgings involves the heating, insulation and cooling process of materials in order to improve the mechanical properties and structural properties of materials. The following are the general steps for evaluating the heat treatment process and effect of starting rod forgings:
- Material pretreatment: Before heat treatment, it is necessary to clean the surface of the starting rod forgings to remove impurities such as oil and oxide film that may exist.
- Heating stage: Put the starting rod forging into the furnace for heating, and determine the appropriate heating temperature and holding time according to the heat treatment requirements of specific materials. The heating temperature should be controlled above the material phase transition temperature to make the grains grow completely.
- Insulation stage: After reaching the appropriate heating temperature, maintain a certain amount of insulation time, so that the internal temperature of the material is evenly distributed, resulting in the desired organizational structure.
- Cooling stage: according to the nature of the material and the required organizational structure, choose the appropriate cooling method. Common cooling methods include air cooling, water quenching and oil quenching, which are used to quickly cool the material and produce the required hardness and structure.
- Evaluation effect: Performance test and metallographic analysis of the starter bar forgings after heat treatment. Performance test includes hardness test, tensile test, impact test, etc., to evaluate the mechanical properties of materials. Metallographic analysis By observing the microstructure and phase transformation of the material with a microscope, the grain size, phase proportion and phase distribution of the material are known.
When evaluating the heat treatment effect, it is necessary to compare and analyze the experimental data obtained with the design requirements of the starter bar forging to determine whether the performance requirements are met. According to the evaluation results, the heat treatment process can be adjusted and optimized to improve the performance and quality of the starter bar forging.
