激光淬火基体对镀铬层断裂韧性的影响  

Effect of Laser-Quenching Substrate on the Fracture Toughness of Chromium Plated Coatings

作　　者：张国祥[1] 陈光南[1] 张坤[1] 罗耕星[1] 李怀学[1] 

机构地区：[1]中国科学院力学研究所

出　　处：《金属热处理》2007年第3期52-55,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50471087;50531060)

摘　　要：为提高30CrNi2MoVA钢镀铬身管的寿命,采用YAG激光器对钢基体进行激光搭接淬火再镀铬的复合工艺。用多裂纹拉伸技术对经激光搭接处理的30CrNi2MoVA钢再镀铬后的铬层和普通铬层的断裂韧性进行比较。结果表明,激光淬火处理基体可以提高镀铬层的断裂韧性。力学模型分析表明,基体残余压应力以抵抗基体拉伸变形的方式提高了铬层的断裂韧性;化学去基体法研究铬层界面表明,激光处理基体以细化基体影响层的晶粒形式提高了铬层的强度和韧性。离子刻蚀横截面对拉伸结果作了进一步验证。In order to improve the life of Cr-plating gun bore made of 30CrNi2MoVA steel, a compound process ,firstly laser overlap-quenching by YAG and then Cr-plating, was carried out for the steel substrate. By using multi-crack tensile method, the fracture toughness of Cr-eoating produced by the compound process was comparatively analyzed with that of the ordinary Cr plated coating. The results show that the fracture toughness of Cr-eoatings is improved by laser quenching substrate. The analysis of mechanical model shows that the fracture toughness is improved by residual compressive stress of substrate surface, which resists the tensile deformation of substrate. The study of Cr-eoating interface by chemically removing substrate shows that the strength and toughness effecting layer caused by laser processing substrate. The cross-section. of the Cr-eoating is improved, due to the grain refining substrate toughness improvement is further ,verified by ion etching of the cross-section.

关 键 词：30CrNi2MoVA钢 激光淬火基体 镀铬 断裂韧性 

分 类 号：TN249[电子电信—物理电子学] TG156.99[金属学及工艺—热处理]