活性屏与工件的距离对40Cr钢活性屏离子渗氮行为的影响  

Effect of the Distance Between Screen and Sample on Active Screen Plasma Nitriding Behavior of 40Cr Steel

作　　者：郭俊文[1] 田林海[1] 林乃明[1] 唐宾[1] 

机构地区：[1]太原理工大学表面工程研究所,太原030024

出　　处：《中国表面工程》2014年第3期31-37,共7页China Surface Engineering

基　　金：中国博士后科学基金(2012M520604);山西省青年科技研究基金(2013021013-2)

摘　　要：为提高40Cr钢的抗磨及耐蚀性能,用304不锈钢冲孔板制成的活性屏对40Cr钢进行离子渗氮(ASPN)处理,研究了活性屏与工件的距离对渗层组织结构和性能的影响,并与普通直流离子渗氮(DCPN)进行了比较。用光学显微镜(OM)、X射线衍射仪(XRD)、辉光放电光谱仪(GDOES)、显微硬度计、往复摩擦磨损试验机和电化学工作站对渗层组织、相成分、硬度、耐磨及耐腐蚀性能进行分析。结果表明:经不锈钢活性屏离子渗氮处理后,试样表面得到了致密均匀的渗氮层,渗层主要由ε-Fe2-3N、γ′-Fe4N和CrN相组成,且随着试样与活性屏距离从10mm、20mm增加到30mm,对应的渗层厚度从6μm、4.7μm减小到3.5μm。经氮化处理后,40Cr钢的耐磨性和耐腐蚀性都有显著的提高,ASPN处理后试样的耐腐蚀性较DCPN有明显的提高。Active screen plasma nitriding（ASPN）treatment with a screen made of 304stainless steel punched plate was used to improve the wear and corrosion resistance of 40Cr steel.The effect of distance from the screen to the samples on the microstructure and properties of the nitriding layer was investigated.The results by ASPN were compared with that by conventional direct current plasma nitriding（DCPN）.The microstructures,phase constitutions,microhardness and the wear and corrosion resistance the wear and corrosion resistance of the nitrided layers were examined by optical microscope（OM）,X-ray diffraction（XRD）,glow discharge spectrometer（GDOES）,microhardness tester,reciprocating friction and wear tester and electrochemical station of the nitrided layer.The results showed that continuous and compact nitriding layers formed by ASPN with a stainless steel screen were consisted ofε-Fe2-3N,γ′-Fe4N and CrN phases.The thickness of the nitriding layer is reduced from 6μm,4.7μm to 3.5μm with the distance between the screen and the samples increasing from 10,20to 30mm.Both wear and corrosion resistance of 40Cr steel are significantly improved after nitriding treatment.The corrosion resistance of samples treated by ASPN was improved more significantly than the one by DCPN.

关 键 词：活性屏离子渗氮 40CR钢 渗氮层 耐磨性 耐蚀性 

分 类 号：TG161[金属学及工艺—热处理]