回火工艺对H13模具钢渗氮层的影响  

Effects of Tempering Treatment on Nitriding Layer of H13 Die Steel

作　　者：鞠慧[1,2] 李落星[1,2] 王群[2] 周佳[1,2] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南大学材料科学与工程学院,长沙410082

出　　处：《机械工程材料》2011年第4期7-9,37,共4页Materials For Mechanical Engineering

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"十一五"科技支撑计划重点课题项目(2007BAE38B04)

摘　　要：用光学显微镜、扫描电镜及X射线衍射仪等研究了淬火+不同回火工艺处理H13模具钢再经相同气体渗氮处理后的渗层组织,用显微硬度计测试了渗层横截面的硬度,分析了回火工艺对渗氮层的影响。结果表明:经淬火+两次350℃回火的试样再渗氮后渗层较致密,硬度变化较平缓,但渗层厚度低于淬火+两次600℃回火后渗氮试样的;淬火+两次600℃回火试样渗层的化合物层下有微裂纹,硬度变化较大;而淬火态直接渗氮试样未能获得具有良好综合性能的渗层。The microstructure of the nitriding layer of H13 die steel after gas-nitriding under quenching and different tempering treatment conditions was studied by OM, SEM and XRD. The hardness of the cross section of nitricling layer was measured by microhardness tester, and the influence of tempering treatment on the layer was analyzed. The results show that the nitriding specimen after quenching and twice tempering at 350 ~C had a compact diffusion layer, and the hardness of samples changed gradually. After quenching and twice tempering at 600 ~C, the nitriding specimen had thicker nitriding layer, but tiny cracks generated beneath the compound layer and the hardness of samples showed large scale change. The nitriding specimen after quenching had not obtain the nitriding layer with good comprehensive properties.

关 键 词：H13模具钢 回火 渗氮层 

分 类 号：TG162.4[金属学及工艺—热处理] TG156.8[金属学及工艺—金属学]