17-4PH钢脉冲等离子体稀土氮碳共渗研究  

Study on Pulse Plasma RE Nitrocarburizing of Steel 17-4PH

作　　者：刘瑞良 闫牧夫[1] 候凯[2] 赵成志[2] 赵丽艳[1,3] 

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [3]大连创新齿轮箱制造有限公司,辽宁大连116314

出　　处：《热处理》2009年第1期26-30,共5页Heat Treatment

基　　金：国家自然科学基金(50471019);教育部博士点基金(20060213017);哈尔滨市科技攻关项目(2004AA5CG092)资助

摘　　要：基于XRD、OM、STM、TEM分析与显微硬度和磨损测试研究了17-4PH钢在500℃有无稀土添加时脉冲等离子体氮碳共渗动力学、渗层的组织结构和性能。结果表明，添加稀土不改变共渗层的表面相结构，但提高了渗层中γ-Fe4N相的比例，使表面氮浓度提高7％，渗层深度最大可增加55％，表层显微硬度提高100～200HV；无稀土添加共渗层在抛光研磨过程中发生了粘着磨损；此外，在渗层中观察到了位错、层错等晶体缺陷。The growth kinetics, microstructure and mechanical properties of the surface layer of steel 17-4PH subjected to pulse plasma nitrocarburizing at 500℃ with or without rare earth （RE） addition were investigated based on a series of analysis of XRD,EDS,OM,STM and SEM as well as microhardness and wear measurements. The results show that the incorporation of RE does not change the surface phase structure but, instead, increases the proportion of γ＇-Fe4N phase in modified layer and leads to the increases of 7% , 55% and 100 -200 HV in the surface nitrogen concentration, nitrocarburized layer thickness and surface microhardness, respectively. The adhesion wear ocuurs in the nitrocarburized layer without RE addition during grinding. In addition, the crystal defects such as dislocation and fault have been observed in the plasma RE nitrocarburized layer.

关 键 词：17—4PH钢 稀土 氮碳共渗 动力学 显微结构 力学性能 

分 类 号：TG156.82[金属学及工艺—热处理]