固溶温度对18Cr2Ni4W合金渗硼后组织和性能的影响

Effects of Solid Solution Temperature on Microstructure and Mechanical Property of 18Cr2Ni4W Alloy After Boriding

利用金相、XRD、硬度等方法研究不同固溶温度对18Cr2Ni4W表面渗硼后的组织和性能的影响。结果表明:不同温度的固溶处理改变硼化物的分布和硬度梯度的分布,随着温度的增加,渗硼层的厚度先增加后减小。其中,18Cr2Ni4W合金经过860℃、6 h渗硼处理,再经过760℃固溶处理15 min及560℃高温回火1 h后获得最佳性能;表面硬度可达1400 HV,心部硬度400 HV,有良好的硬度和塑韧性。

The effects of different solid solution temperatures on the microstructure and properties of 18Cr2Ni4W alloy after boriding were investigated by metallographic,XRD,hardness testing.The results show that the different temperatures solid solution treatment can change the distribution of the boride and the distribution of the hardness gradient.With the increase of temperature,the thickness of the boriding layer firstly increases and then decreases.Among them,the 860℃nitriding 6 h for 18Cr2Ni4W alloy,and then the 760℃high temperature solid solution 15 min,and 560℃high temperature tempering 1 h is used,and the best overall performance is obtained by the above technology.The surface hardness can reach 1400 HV,the hardness of the core is 400 HV and the alloy has good hardness and ductility.