引用本文:关宏博， 陈磊， 张修铭， 张天乐， 修世超.预应力干磨削加工40Cr工件表面微结构损伤[J].中国表面工程,2016,29(2):117~122
GUAN Hongbo, CHEN Lei, ZHANG Xiuming, ZHANG Tianle, XIU Shichao.Surface Micro-structure Damage of 40Cr Samples in Pre-stressed Dry Grinding Process[J].China Surface Engineering,2016,29(2):117~122
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预应力干磨削加工40Cr工件表面微结构损伤
关宏博， 陈磊， 张修铭， 张天乐， 修世超1,2
1.东北大学 机械工程与自动化学院;2.克莱姆森大学 机械工程系
摘要:
表面残余应力、表面烧伤、磨削裂纹等表面微结构损伤是评价零件表面质量的重要指标，直接影响零件的使用寿命，严重时造成零件失效。为研究预应力干磨削加工零件表面微结构损伤特征及规律，以40Cr材料为载体，开展预应力磨削加工试验研究，检测残余应力、硬度，并采用SEM、EDS等方法分析表面层形貌和化学成分。结果表明，试件加工表面存在淬硬现象，预应力对工件表层残余应力有较好的抑制作用，表层残余拉应力随磨削深度增大而增大，随预应力增大而减小。磨削深度对熔融涂覆及表面微裂纹损伤影响程度较大，磨削烧伤表面形成氧化膜会影响零件使用性能。预拉应力通过改变残余应力状态而对表面磨削微裂纹损伤起到抑制作用。
关键词:  预应力  干磨削  40Cr  残余应力  微损伤  表面裂纹
DOI：10.11933/j.issn.1007-9289.2016.02.017
分类号:
基金项目:
Surface Micro-structure Damage of 40Cr Samples in Pre-stressed Dry Grinding Process
GUAN Hongbo, CHEN Lei, ZHANG Xiuming, ZHANG Tianle, XIU Shichao1,2
1. School of Mechanical Engineering and Automation, Northeastern University;2. Department of Mechanical Engineering, Clemson University
Abstract:
Surface residual stress, surface burns, ground cracks and other surface microstructure damages, which affect the service life of parts directly and even cause serious component failure, are important factors to measure the surface quality of parts. A prestressed dry grinding test was performed for 40Cr steel and residual stress, hardness were also tested. The morphology and chemical composition of the surface layer were studied by adopting the analytical methods, such as SEM and EDS. The results show that the surface layer of sample is hardened, and prestress restrains residual tension stress. Residual tension stress increases with increasing of grinding depth and decreases with increasing of the prestress. The grinding depth has a significant effect on surface melting coating and microcrack damages. The oxidation film caused by grinding burn can affect the performance of sample. Prestress can reduce the grinding microcrack damages by changing the residual stress.
Key words:  prestressed  dry grinding  40Cr  residual stress  microstructure damage  surface cracks
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