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激光喷丸强化对电化学充氢316L奥氏体不锈钢振动疲劳性能的影响
引用本文:黄舒,胡磊,盛杰,孟宪凯,宋云剑,鲁金忠,周建忠.激光喷丸强化对电化学充氢316L奥氏体不锈钢振动疲劳性能的影响[J].稀有金属材料与工程,2022,51(2):579-587.
作者姓名:黄舒  胡磊  盛杰  孟宪凯  宋云剑  鲁金忠  周建忠
作者单位:江苏大学,江苏大学,江苏大学,江苏大学,江苏大学,江苏大学,江苏大学
基金项目:国家自然科学基金面上项目(51775252);国家自然科学基金青年基金(52005223);中国博士后科学基金63批面上一等资助项目(2018M630526);江苏省自然科学青年基金(BK20180881);江苏省第十五批“六大人才高峰”高层次人才选拔培养资助(GDZB-050);泰州市科技支撑计划-产业关键技术研发(TG202026)
摘    要:研究了激光喷丸强化对电化学充氢316L奥氏体不锈钢振动疲劳性能的影响.测试分析了不同激光功率密度喷丸316L不锈钢充氢试样的残余应力、显微硬度和微观组织结构,并对比研究其振动疲劳寿命和断口形貌.结果 显示,激光喷丸诱导材料表层位错密度增加,并有效细化晶粒,抑制了氢原子的入侵,同时复杂晶界和高密度位错增殖结构阻碍了氢原子...

关 键 词:激光喷丸  316L不锈钢  氢脆  振动疲劳  疲劳断口形貌
收稿时间:2021/2/6 0:00:00
修稿时间:2021/4/20 0:00:00

Effect of Laser Peening on Vibration Fatigue Performance of Electrochemically Hydrogen-charged 316L Austenitic Stainless Steel
Huang Shu,Hu Lei,Sheng Jie,Meng Xiankai,Song Yunjian,Lu Jinzhong and Zhou Jianzhong.Effect of Laser Peening on Vibration Fatigue Performance of Electrochemically Hydrogen-charged 316L Austenitic Stainless Steel[J].Rare Metal Materials and Engineering,2022,51(2):579-587.
Authors:Huang Shu  Hu Lei  Sheng Jie  Meng Xiankai  Song Yunjian  Lu Jinzhong and Zhou Jianzhong
Affiliation:Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University
Abstract:The effect of laser peening on vibration fatigue performance of electrochemically hydrogenated 316L austenitic stainless steel was studied. The residual stress, microhardness and microstructure of laser peened specimens with different power densities followed by hydrogen charging were tested and analyzed, and the vibration fatigue life and fracture morphology of the corresponding specimens were compared and studied. The results show that laser peening induces an increase in dislocation density on the surface of material and effectively refine the grains, which inhibits the invasion of the hydrogen atom. At the same time, the complex grain boundary and high density dislocation multiplication structure hinder the aggregation and diffusion of hydrogen atoms, reduce the degree of the martensitic transformation of 316L austenitic stainless steel, which helps to suppress micro-crack initiation. On the other hand, the high residual compressive stress induced by laser peening not only inhibits hydrogen penetration, but also increases the fatigue crack growth threshold and slows down the crack growth rate. Vibration fatigue test results show that the fatigue life of laser peened specimens with different power densities followed by hydrogen charging has been significantly improved, and the maximum amplitude can be up to 79.36%. The fracture morphology analysis further proves that laser peening can effectively reduce the fatigue crack growth rate of hydrogen-charged specimens, increase the fracture toughness of the material, and then improve the vibration fatigue properties of materials.
Keywords:laser peening  316L stainless steel  hydrogen embrittlement  vibration fatigue  fatigue fracture morphology
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