喷丸压力对GH3535合金表面状态及疲劳性能的影响  

Effect of Shot Peening Pressure on the Surface State and Fatigue Properties of GH3535 Alloy

作　　者：吴培松 张继祥[1] 周伯谋 薛召露 陆燕玲[2] Wu Peisong;Zhang Jixiang;Zhou Bomou;Xue Zhaolu;Lu Yanling(School of Mechanotronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Research Center of Modern Surface and Interface Engineering,Anhui University of Technology,Ma'anshan 243002,China)

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074 [2]中国科学院上海应用物理研究所,上海201800 [3]安徽工业大学现代表界面工程研究中心,安徽马鞍山243002

出　　处：《稀有金属材料与工程》2022年第12期4610-4617,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52071330);上海市科委项目(19DZ2200300);中国科学院战略先导专项项目(XDA02004210);重庆市技术创新与应用发展重点专项(鲁渝科技协作计划项目)(cstc2020jscx-lyggX0007);重庆市研究生导师团队建设项目(JDDSTD2019007);重庆市研究生联合培养基地(JDLHPYJD2020032)。

摘　　要：采用喷丸压力分别为0.3、0.45和0.6 MPa对GH3535高温合金表面进行喷丸。利用SEM观察合金表面形貌、强化层组织结构,通过OM、维氏硬度计、X射线应力分析仪分析表层晶粒度、表层显微硬度、表层残余应力分布及X射线衍射峰半高宽。在室温条件下进行高周疲劳试验,并通过SEM观察分析断口形貌特征。结果表明:GH3535合金喷丸后表层形成了晶粒细化层、硬化层和残余压应力层。合金表面产生的晶粒细化层厚度、硬化层厚度以及残余压应力层厚度均随着喷丸压力的增加而提高。喷丸压力在0.3~0.6 MPa范围内,疲劳寿命受喷丸压力的影响较为敏感,且疲劳寿命随着喷丸压力的增加而提高。当喷丸压力为0.6MPa时,喷丸产生的效果最优,疲劳寿命提高了471.1%。喷丸后GH3535合金疲劳寿命的提高得益于合金表面状态的改善。The surface of GH3535 superalloy was shot peened with the shot peening pressures of 0.3, 0.45 and 0.6 MPa. The surface profile morphology of the alloy and the structure of the strengthening layer were observed by SEM. The surface grain size, surface microhardness, surface residual stress distribution and X-ray diffraction peak half-height width were analyzed by OM, Vickers hardness tester, X-ray stress analyzer. The high-cycle fatigue experiment was carried out at room temperature, and the morphological characteristics of the fracture were observed and analyzed by SEM. The results show that the grain refinement layer, hardened layer and residual compressive stress layer are formed on the surface of GH3535 alloy after shot peening. And the thickness of the grain refinement layer, the thickness of the hardened layer and the thickness of the residual compressive stress layer produced on the surface of the alloy all increase with the increase of the shot peening pressure. The shot peening pressure is in the range of 0.3 MPa to 0.6 MPa, and the fatigue life is more sensitive to the impact of shot peening pressure, and the fatigue life increases with the increase of shot peening pressure. When the shot peening pressure is 0.6 MPa, the effect of shot peening is the best, and the fatigue life is increased by 471.1%. The increase in fatigue life of GH3535 alloy after shot peening benefits from the improvement of the alloy surface condition.

关 键 词：GH3535合金 喷丸压力 显微硬度 残余应力 高周疲劳 

分 类 号：TG146.15[一般工业技术—材料科学与工程]