1Cr11Ni2W2MoV钢的离子渗氮  

Plasma nitriding of 1Cr11Ni2W2MoV steel

作　　者：王琳[1] 孙枫[1] 佟小军[1] 贺瑞军[1] 程志永[1] 

机构地区：[1]中航工业北京航空材料研究院,北京100095

出　　处：《金属热处理》2015年第6期128-131,共4页Heat Treatment of Metals

摘　　要：利用脉冲直流辉光等离子技术,对1Cr11Ni2W2MoV马氏体热强不锈钢进行不同工艺参数的离子渗氮。利用光学显微镜、显微硬度计、XRD对渗氮层的显微组织及硬度进行了分析。结果表明,在所选用的离子渗氮工艺参数下,1Cr11Ni2W2MoV钢渗层只由扩散层组成,渗氮温度≤560℃时,渗层主要由固溶N原子的α相组成,并伴有少量的γ'-Fe4N和CrN析出;随着渗氮温度的升高和渗氮时间的延长,固溶N原子的α相逐渐转变成γ'-Fe4N相,当处理温度达到590℃时,渗层主要由γ'-Fe4N和Cr N组成。离子渗氮后渗层的表面硬度较未渗氮前有显著的提高,在一定范围内,渗层的表面硬度和渗层深度都随着渗氮温度和渗氮时间的增加而增加,渗层硬度梯度分布也随着渗氮时间的延长变得平缓。Using pulsed DC glow discharge plasma technology, 1Cr11Ni2W2MoV martensitic stainless steel was plasma nitrided under different conditions. Microstructure and microhardness of the nitridied layer were investigated by optical microscopy, microhardness tester and X-ray diffraction. The results show that the nitrided layers only contain the diffusion layers under the selected nitriding parameters. The nitridied layers are mainly composed of α phase with some γ′-Fe4 N phase and CrN phase when treated below 560 ℃. With the increase of the treatment temperature and time, α phase decomposes and gradually transform into γ′-Fe4 N. When the treatment temperature reaches 590 ℃, the nitridied layers are mainly composed ofγ′-Fe4 N and CrN phases. The microhardness of nitridied layers is obviously higher than that of the substrate, within a certain range, the microhardness and depth of nitrided layer all increase with the raise of the treatment temperature and time, and the nitrided layer hardness distribution comes more smooth with the treatment time prolonging.

关 键 词：1CR11NI2W2MOV钢 离子渗氮 渗氮温度 渗氮时间 渗层组织 

分 类 号：TG156.82[金属学及工艺—热处理]