崔通,贺甜甜,杜三明,李阳,李净凯,连阳,张永振.激光冲击强化对GCr15轴承钢微观组织和摩擦学行为的影响[J].表面技术,2022,51(7):353-362.
CUI Tong,HE Tian-tian,DU San-ming,LI Yang,LI Jing-kai,LIANYang,ZHANG Yong-zhen.Effect of Laser Shock Processing on Microstructure and Tribological Behavior of GCr15 Bearing Steel[J].Surface Technology,2022,51(7):353-362
激光冲击强化对GCr15轴承钢微观组织和摩擦学行为的影响
Effect of Laser Shock Processing on Microstructure and Tribological Behavior of GCr15 Bearing Steel
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.07.035
中文关键词:  GCr15轴承钢  激光冲击强化  微观组织  力学性能  摩擦磨损性能  磨损机制
英文关键词:GCr15 bearing steel  laser shock processing  microstructure  mechanical properties  friction wear  wear mechanism
基金项目:国家自然科学基金(51905153);国家重点研发计划(2018YFB2000302)
作者单位
崔通 河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室,河南 洛阳 471023 
贺甜甜 河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室,河南 洛阳 471023 
杜三明 河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室,河南 洛阳 471023 
李阳 郑州大学 机械与动力工程学院,郑州 450001 
李净凯 郑州大学 机械与动力工程学院,郑州 450001 
连阳 郑州大学 机械与动力工程学院,郑州 450001 
张永振 河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室,河南 洛阳 471023 
AuthorInstitution
CUI Tong National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang 471023, China 
HE Tian-tian National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang 471023, China 
DU San-ming National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang 471023, China 
LI Yang School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
LI Jing-kai School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
LIANYang School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
ZHANG Yong-zhen National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang 471023, China 
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中文摘要:
      目的 激光冲击强化处理后GCr15轴承钢实现表面纳米化,同时其力学性能和摩擦磨损性能得到显著改善。方法 采用激光冲击强化对GCr15轴承钢进行表面强化。使用三维形貌仪、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、显微硬度计、X射线残余应力分析仪(LXRD)以及摩擦磨损实验仪,对GCr15轴承钢经激光冲击强化处理后的微观组织、力学性能和摩擦磨损性能进行研究。结果 经过激光冲击强化处理后,GCr15轴承钢的位错密度增加,马氏体分布更加均匀且宽度下降,电子衍射花样呈连续的环状,说明有纳米晶组织生成;有效提高材料表面硬度,与原始试样相比,硬度提升了5.1%,并引入了大小为947 MPa左右、深度约为900 μm的残余压应力层;平均摩擦因数下降,磨痕宽度和深度都减小,磨损率的下降幅度为17%~21%,磨损机理以磨粒磨损为主,并伴随一定的黏着和氧化磨损,耐磨性得到提高。 结论 激光冲击强化使GCr15轴承钢的位错密度增加、马氏体碎化且碳化物数量增加、粒径下降;提高了GCr15轴承钢的硬度并在材料次表层构建了残余压应力层,残余压应力在滑动干摩擦过程中释放,马氏体晶粒细化和残余应力释放可有效提高GCr15轴承钢的耐磨性。
英文摘要:
      Observe the microstructure changes of GCr15 bearing steel and improve the mechanical properties and friction wear properties of GCr15 bearing steel after laser shock processing treatment. The surface of GCr15 bearing steel was strengthened by LSP. The microstructure and mechanical properties of GCr15 bearing steel subjected to LSP were characterized by three-dimensional surface profilometer, X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Microhardness Tester,X-ray residual stress analyzer (LXRD) and friction wear tester. The results show that the dislocation density of GCr15 bearing steel increases after LSP treatment, the distribution of martensite is more uniform and the width decreases, the electron diffraction pattern is in a continuous ring shape that shows there is nanocrystalline structure formation; effectively improve the surface hardness of the material after LSP, which is 5.1% higher than the hardness of the original sample, a residual compressive stress layer is generated on the secondary surface of GCr15 bearing steel, which strength is about 947 MPa and the depth is about 900 μm; the average friction coefficient decreases, the width and depth of the wear scars decrease, the wear rate decreases by 17%-21%, the wear mechanism is mainly abrasive wear, accompanied by a certain degree of adhesion and oxidative wear, it shows that laser shock processing improves the wear resistance of GCr15 bearing steel. Laser shock processing increases the dislocation density of GCr15 bearing steel, martensite is crushed,the number of carbides increase and particle size reduces; improve the hardness of GCr15 bearing steel and build a residual compressive stress layer; grain refinement and the residual compressive stress that is released during the sliding dry friction can effectively improve the wear resistance of GCr15 bearing steel.
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