激光冲击强化对中碳合金钢的组织和性能的影响  

Effects of Laser Shocking Peening on Microstructure and Properties of Medium Carbon Alloy Steel

作　　者：韩志嵘[1] 林芸[1] 鄢吉多[1] 刘洁[1] HAN Zhirong;LIN Yun;YAN Jiduo;LIU Jie(College of Mechanical Engineering,Guiyang University,Guiyang 550005,China)

机构地区：[1]贵阳学院机械工程学院,贵州贵阳550005

出　　处：《热加工工艺》2020年第18期108-110,共3页Hot Working Technology

基　　金：贵阳市财政支持贵阳学院学科建设与研究生教育项目(JX-2020);贵州省科学技术基金项目(黔科合LH字[2014]7217号);贵州省教育厅重点项目(黔教合KY字[2014]278号)。

摘　　要：通过激光冲击强化对42CrMo中碳合金钢进行了表面强化处理。采用显微组织观察、硬度测试、摩擦磨损实验研究了不同脉冲能量的激光冲击强化处理对42CrMo钢组织和性能的影响。结果表明:未经激光冲击强化的42CrMo钢组织中铁素体均匀连续,珠光体片层间铁素体较为明显。随着激光冲击强化输出能量的增加,组织中铁素体越来越分散,珠光体片层组织越来越不明显,激光冲击强化后42CrMo钢中有大量位错、亚晶出现。在32~36 J的脉冲能量范围内,激光冲击强化的该钢的表面硬度和耐磨性显著提高,并在表面形成了厚度0.75 mm的硬化层。激光冲击强化冲击能量越高,42CrMo钢硬度越高,耐磨性越好。The surface strengthening treatment of medium carbon alloy steel 42 CrMo was conducted by laser shocking peening. The effects of laser shocking peening treatment under different pulse energy on the microstructure and properties of42 Cr Mo steel were studied by microstructure observation, hardness test and friction wear test. The results show that the ferrite in 42 CrMo steel microstructure without laser shocking peening is uniform and continuous and the ferrite in the pearlite laminate is more obvious. With the increase of laser shock intensification output energy, the ferrite in the microstructure is more and more disperse, and the pearlite lamellar microstructure is less and less obvious. There are a lot of dislocations and sub-grain appearing in 42 CrMo steel after laser shocking peening. In the pulse energy range of 32-36 J, the surface hardness and wear resistance of the steel after laser shocking peening significantly improve, and the hardened layer with the thickness of 0.75 mm appears on the surface. The higher the impact energy of laser shock, the higher the hardness of 42 CrMo steel, the better the wear resistance.

关 键 词：42CRMO钢 激光冲击强化 显微硬度 耐磨性 

分 类 号：TG178.1[金属学及工艺—金属表面处理]