热处理对模具钢组织与力学性能的影响
Effect of Heat Treatment on Microstructure and Mechanical Properties of Mould Steel
刘存平1, 郭 晟1, 陈真章2
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作者单位：(1. 宜宾职业技术学院 现代制造系, 四川 宜宾 644003; 2. 西南交通大学 材料学院, 四川 成都 610031)
中文关键字：热处理； 力学性能； 塑料模具钢
英文关键字：heat treatment; mechanical properties; plastic mould steel
中文摘要：考察3Cr2Mo型塑料模具钢经200～600 ℃回火处理后的力学性能和组织形态变化。结果表明，回火处理后，该钢粒状贝氏体组织出现大量针状碳化物和稳定化的不连续条形岛状组成物，发现其有利于提高3Cr2Mo钢的冲击韧度和屈服强度。当在350 ℃回火处理3 h，可使该钢的屈服强度提高40%，冲击韧度提高60%。
英文摘要：The mechanical properties and microstructure evolution of 3Cr2Mo steel after tempering at 200～600 ℃ were investigated. The results show that the distribution and morphology of carbide and the mounts of M/A small islands play a key role in improving impact toughness and yield strength. The optimized tempering process is 350 ℃ for 3 h and air cooling, and the tensile strength and impact toughness of processed steel could be promoted nearly by 40% and 60%, respectively.