扫描间距对激光相变硬化组织及其性能的影响  

Influence of Scanning Space on Microstructure and Propertics of Laser Transformation Hardening

作　　者：李刚[1] 邱星武[1,2] 任鑫[1] 邱玲[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,阜新123000 [2]凌源钢铁集团有限责任公司机动部,朝阳122504

出　　处：《腐蚀科学与防护技术》2010年第1期24-27,共4页Corrosion Science and Protection Technology

摘　　要：利用HL-1500横流CO2激光加工机对40Cr钢表面进行激光相变硬化处理,利用扫描电镜、X射线衍射仪、显微硬度计、恒电位仪、磨损试验机等研究了不同扫描间距对激光相变硬化层组织性能的影响.结果表明:激光相变硬化层主要由Fe、Fe3C、Fe-Cr、Cr3C2等相组成.当扫描间距为8 mm时,回火作用显著,扫描间距为16 mm时,回火作用不明显.试样的显微硬度随扫描间距的增大先升高后降低,扫描间距为12 mm时,试样的平均显微硬度最高,为794.7 MPa.随着扫描间距的增加,耐蚀性和耐磨性均增强.Laser surface hardening was carried out by HL-1500 CO2 laser machine on 40Cr steel ,and the influence of scanning space on microstructure and properties of laser transformation hardened layers were investigated by means of scanning electron microscope, X-ray diffractometer, microhardness meter, potentiostat and abrasive wear testing machine etc. The result indicated that, the laser transformation hardened layer is mainly consisted of Fe, Fe3 C, Fe-Cr and Cr3 C2. The tempering effect is obvious when scanning space is 8 mm, and when scanning space is 16 mm, the tempering effect is not obvious. The microhardness of the samples increased at first and then decreased with the increasing of the scanning space. The maximum microhardness 794. 7 MPa is obtained when scanning space is 12 mm. Both the corrosion resistance and wear resistance are enhanced with the increasing of the scanning space.

关 键 词：激光相变硬化 40CR钢 扫描间距 组织 性能 

分 类 号：TG156.99[金属学及工艺—热处理]