激光冲击强化对42CrMo钢耐高温腐蚀性能的影响  

Influence of laser shock processing on high temperature corrosion behavior of 42CrMo alloy steel

作　　者：李传君[1] 李凯[1] 黄婉婉[1] 陆益顺 吕东明 王志强[2] 俞婷[3] 韩彬 LI Chuanjun;LI Kai;HUANG Wanwan;LU Yishun;LV Dongming;WANG Zhiqiang;YU Ting;HAN Bin(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;China Machinery Industry Federation,Beijing 100823,China;Jingjiang College,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Mechanical Engineering,Southeast University,Nanjing,Jiangsu 210096,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]中国机械工业联合会,北京100823 [3]江苏大学京江学院,江苏镇江212013 [4]东南大学机械工程学院,江苏南京210096

出　　处：《江苏大学学报（自然科学版）》2018年第2期217-221,共5页Journal of Jiangsu University：Natural Science Edition

基　　金："十二五"国家重大科技专项(2011ZX05024-005-004)

摘　　要：采用高能量纳秒级脉冲激光,对42CrMo合金钢表面进行激光冲击强化处理,测定42CrMo钢在激光冲击强化后的残余应力、硬度及粗糙度,并对试样进行高温腐蚀试验,利用扫描电子显微镜(SEM)观察试样表面的微观形貌,研究激光冲击强化处理对42CrMo钢耐高温腐蚀性能的影响.结果表明:激光冲击强化后试样表面腐蚀形貌明显比未进行激光冲击处理试样更好.激光冲击强化后42CrMo钢耐高温腐蚀性能得到提升,主要是由于材料表面残余压应力层能够抑制材料表面氧化膜的脱落,提高其耐高温腐蚀性能.与小能量激光冲击相比,大能量冲击可以大幅度提高试样表层的残余压应力值,并提高残余压应力的影响深度.The laser shock processing(LSP)was carried out for 42CrMo alloy steel with high energy nanosecond pulse laser.Residual stress,hardness and roughness of 42CrMo alloy steel were determined after LSP.The high temperature corrosion tests of untreated and treated samples by LSP were conducted.The surface micro-topography of 42CrMo alloy steel was observed by scanning electron microscope(SEM)to investigate the high temperature corrosion resistance of 42CrMo alloy steel.The results show that the corrosion morphology of the specimen after LSP is obviously better than that without LSP.The enhancement of high temperature corrosion resistance of 42CrMo steel after LSP is mainly due to the existence of residual compressive stress layer on material surface,which can inhibit the oxide film from falling off and improve the high temperature corrosion resistance.Compared with small energy laser shock,the large energy impact can greatly increase the compressive residual stress of specimen surface and enhance the influence of residually compressive stress.

关 键 词：42CrMo合金钢 激光冲击 高温腐蚀 残余压应力 硬度 

分 类 号：TN249[电子电信—物理电子学]