摘要
运用正交试验法,研究H13钢气体渗氮工艺。以获得较高表面硬度和渗层厚度为依据,分析影响渗氮层结构和性能的主要工艺因素,确定出最佳工艺参数。采用光学显微镜及X射线衍射研究渗氮层的组织结构,采用显微硬度计测定化合物层的显微硬度。结果表明,影响渗氮层硬度和厚度的主要因素是渗氮温度和氨气分解率,最大渗层厚度为244.3μm,最560℃回火,氮化温度535℃,氮化时间15h,氨气分解率50%。
The gas nitriding technology of H13 steel was studied by an orthogonal test. For obtaining high surface hardness and great thickness, the main factors which affect the nitriding layer structure and properties were analyzed, and the optimized parameters were obtained. The microstructure of the nitriding layer of H13 tool steel after gas nitriding were studied by OM and X-ray, the surface hardness of samples were measured by mi- crohardness tester. The results showed that the main parameters of nitridation process which affect the surface hardness and nitrided case depth are nitriding temperature and decomposition rate of ammonia. The maximum thickness of nitride layer and microhardness are 244.3μm and 1212.6Hv respectively. The optimum technical parameters are that tempering temperature before nitriding, nitriding temperature, time, and decomposition rate of ammonia are 560℃, 535℃, 15h, 50%, respectively.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B06期405-407,共3页
Journal of Functional Materials
基金
湖南大学汽车车身先进设计制造国家重点实验室自主研究课题资助项目(60870005)
教育部长江学者与创新团队发展计划资助项目(531105050037)
湖南省杰出青年基金资助项目(09JJ1007)
国家科技支撑计划重点资助项目(2007BAE38B04)
关键词
H13钢
气体氮化
正交试验
工艺参数
H13 steel
gas nitriding
orthogonal test method
process parameters
