气体氧-氮碳复合处理40Cr钢硬化层的组织及耐蚀性  

Microstructure and corrosion resistance of hardened layer on 40Cr steel by gas oxy-nitrocarburization

作　　者：吴勉[1] 潘邻[1] 张良界[1] 李朋[1] 杨闽红[1] 马飞[1] 陈亚平[1] 

机构地区：[1]武汉材料保护研究所特种表面保护材料及应用技术国家重点实验室

出　　处：《金属热处理》2016年第5期156-159,共4页Heat Treatment of Metals

摘　　要：对采用自主开发的气体氧-氮碳复合处理的40Cr钢与QPQ技术处理的40Cr钢的硬化层进行组织、硬度和耐蚀性对比。结果表明,经气体氧-氮碳复合处理的40Cr钢白亮层厚度为17~22μm,后氧化层厚度为3~5μm,硬度最高达到573.0 HV0.025,有效硬化层厚度达到370μm。由自腐蚀电位和自腐蚀电流密度测量可知,气体氧-氮碳复合处理的40Cr钢与QPQ处理的几乎具有一样的耐蚀性。Microstructure, hardness and corrosion resistance of the hardened layers on 40Cr steel by gas oxy-nitrocarburiation and salt bath QPQ treatment were compared. The results show that when treated by gas oxy-nitrocarburiation, the hardened layer depth is 17-22 μm, the post-oxidation layer depth is 3-5μm, the surface hardness reaches 573.0 HV0. 025 and the effective hardened layer depth is up to 370 μm. Through measuring the self-corrosion potential and self-corrosion current density, the results show that the corrosion resistance of the hardened layer on 40Cr steel by gas oxy-nitrocarburiation is almost in the same lever of that by QPQ treatment.

关 键 词：40CR钢 QPQ 气体氧-氮碳复合处理 组织 耐蚀性 

分 类 号：TG156.82[金属学及工艺—热处理]