激光表面熔凝处理对30Cr2Ni4MoV转子钢高温水腐蚀性能的影响  

The Effects of Laser Surface Melting on Corrosion Resistance of 30cr2ni4mov Rotor Steel in High Temperature Water

作　　者：轩福贞[1] 黄小青[1] 王思玉[2] 沈红卫[2] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]上海汽轮机有限公司,上海200240

出　　处：《热力透平》2007年第4期225-228,260,共5页Thermal Turbine

基　　金：教育部重大项目培育基金项目(704020);上海高校优秀青年教师后备人选支持计划(04YQHB051)

摘　　要：进行了三种强度级别的30Cr2Ni4MoV钢的激光表面熔凝处理，用电化学极化曲线和高温应力腐蚀试验考察了其耐腐蚀性能。研究表明：激光熔凝处理后在30Cr2Ni4MoV表面形成了约10～20μm的致密马氏体硬化层和压应力状态，基材状态对激光熔凝硬化层的性能无明显影响，但激光功率增大会导致表面熔凝层硬度水平降低；激光表面熔凝处理使腐蚀电位左移，腐蚀电流密度减小，抗腐蚀性能明显增强。Laser surface melting （LSM） has been carried out on the 30Cr2Ni4MoV steels with three strength grades. Electrochemistry polarization curve and high temperature stress corrosion experiment were employed to evaluate the corrosion resistance of laser treated 30Cr2Ni4MoV steels. The results indicate that a densified martenstic layer with about 10-20μm in thickness and high hardness was formed on the surface after LSM treatment. The compressive residual stress was detected in the hardened surface layer by using the XRD. No obvious differences between the performances of laser melting layer of the three steels were observed. However, the hardness of laser melting layer decreases with increasing laser energy. It is observed that LSM has resuited the left-shifting of the corrosion potentials,decreasing of corrosion currents and increasing of corrosion resistance performance.

关 键 词：激光表面熔凝 高温水腐蚀 显微硬度 残余应力 

分 类 号：TK265[动力工程及工程热物理—动力机械及工程]