强力喷丸对4Cr5MoSiVl钢离子渗氮的影响
Influence of Powerful Shot-peening on Plasma Nitriding of 4Cr5MoSiVl Steel
汪新衡1, 李淑英2, 匡建新1
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作者单位：(1. 湖南工学院 机械工程系, 湖南 衡阳 421002; 2. 衡阳财经工业职业技术学院 机械系, 湖南 衡阳 421002)
中文关键字：强力喷丸； 4Cr5MoSiVl 钢； 离子渗氮； 物相
英文关键字：powerful shot-peening; 4Cr5MoSiVl steel; plasma nitriding; phase structure
中文摘要：对调质后的4Cr5MoSiVl钢进行强力喷丸处理，将喷丸处理后的试样在520 ℃下离子渗氮1 h。采用光学显微镜、透射电子显微镜、显微硬度仪和X射线衍射仪对比分析了喷丸和未喷丸试样亚表层的显微组织、渗层深度、硬度分布及表面物相组成。结果表明，在520 ℃离子渗氮l h的情况下，喷丸的催渗效果十分明显，喷丸后渗氮层深度从31.6 μm增至52.5 μm，表面层显微硬度从986 HV增加到1084 HV。喷丸试样的渗氮层与未喷丸试样相比，表面物相及含量都有不同。
英文摘要：Powerful shot-peening of 4Cr5MoSiVl steel after quenching and tempering was carried out. Then the 4Cr5MoSiVl steel samples with or without powerful shot-peening were plasma-nitrided at 520 ℃ for 1 h. The microstructure, thickness, hardness gradient and the phase contents of the nitride layer were compared and analyzed using optical microscope, TEM, microhardness tester and X-ray diffract-tometer. The results show that the powerful shot-peening greatly speeds up the nitriding of the 4Cr5MoSiVl steel at 520 ℃ for 1 h. The depth of shot-peening nitrided layer increases from 31.6 μm to 52.5 μm, surface microhardness increases from 986 HV to 1084 HV. Phase structure and content of the nitrided layer with or without powerful shot-peening is different.