多道网格扫描激光相变硬化的性能研究

发布时间：2019-05-15 02:33

【摘要】：采用YLS-3000型光纤激光器对40Cr钢表面进行不同间距的网格扫描激光相变硬化。研究不同网格间距对硬化层的显微组织、硬度、耐磨性和耐蚀性的影响。结果表明:激光相变硬化层横截面由表及里依次可分为相变硬化区、过渡区和基体。相变硬化区的组织为细小针状马氏体+少量残余奥氏体,过渡区的组织为马氏体+残余奥氏体+铁素体+未溶碳化物,基体的组织为铁素体+珠光体。网格扫描相变硬化层的平均硬度约为61 HRC,网格交叉点的平均硬度可达62 HRC。随着网格间距的增加,试样的相对耐磨性先增大再减小,当网格间距为12 mm时,相对耐磨性可达基体的3.25倍。同时,此间距试样的钝化区间最宽,约为1530 m V,耐蚀性最强。
[Abstract]:The grid scanning laser transformation hardening of 40Cr steel surface with different spacing was carried out by using YLS- 3000 fiber laser. The effects of different grid spacing on microstructure, hardness, wear resistance and corrosion resistance of hardened layer were studied. The results show that the cross section of laser transformation hardened layer can be divided into phase transformation hardening zone, transition zone and matrix in turn. In the transformation hardening zone, the microstructure of the transformation hardening zone is a small amount of retained Austenite, the microstructure of the transition zone is the unsoluble carbide of the martensite retained Austenite, and the microstructure of the matrix is Ferrite pearlite. The average hardness of the phase change hardened layer scanned by grid scanning is about 61 HRC,. The average hardness of the grid intersection can reach 62 HRC.. With the increase of grid spacing, the relative wear resistance of the samples increases at first and then decreases. When the grid spacing is 12 mm, the relative wear resistance can reach 3.25 times of that of the matrix. At the same time, the passivation range of the sample is the widest, about 1530 MV, and the corrosion resistance is the strongest.
【作者单位】：辽宁工业大学材料科学与工程学院;
【基金】：辽宁省教育厅一般项目(L2015238) 辽宁省科技厅博士启动项目(201601342)
【分类号】：TG665

【相似文献】