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采用OM、SEM和硬度测试等手段,研究了热处理工艺对5Cr4Ni Mo2VCo钢和H13钢热作模具钢的组织及性能的影响。结果表明:在相同的淬火温度下,5Cr4Ni Mo2VCo钢的淬火硬度高于H13钢,随淬火温度升高,碳化物溶解较多,当淬火温度高于1030℃时,晶粒粗化速率明显增加,淬火温度应不超过1030℃;5Cr4Ni Mo2VCo钢的回火硬度均高于H13钢,两钢的二次硬化峰值温度均为510℃,5Cr4Ni Mo2VCo钢的二次硬化峰值硬度高出H13钢3.7 HRC;在高温阶段,5Cr4Ni Mo2VCo钢具有更好的回火稳定性。
The effects of heat treatment process on the microstructure and properties of 5Cr4Ni Mo2VCo steel and H13 steel hot work die steel were investigated by means of OM, SEM and hardness test. The results show that the quenching hardness of 5Cr4Ni Mo2VCo steel is higher than that of H13 steel at the same quenching temperature. With the increase of quenching temperature, the carbides dissolve more. When the quenching temperature is higher than 1030 ℃, the coarsening rate of crystal grains increases obviously, The quenching temperature should not exceed 1030 ℃. The tempering hardness of 5Cr4Ni Mo2VCo steel is higher than that of H13 steel. The secondary hardening peak temperature of both steel is 510 ℃. The secondary hardening peak hardness of 5Cr4Ni Mo2VCo steel is 3.7 HRC higher than that of H13 steel. In high temperature stage, 5Cr4Ni Mo2VCo steel has better tempering stability.