摘要
零件加工过程中亚表面缺陷的产生与演化直接影响其表面质量与使用寿命,一直是企业界与学术界关注的焦点。从缺陷演化和能量变化角度结合分子动力学的方法研究了氮化硅陶瓷刀具切削镍基单晶合金过程中亚表面缺陷演化机理。采用混合势函数描述切削镍基合金系统原子间的作用力。分析了各种位错,层错的形核、扩展和位错线类型的转化;深入探讨切削速度变化诱发的亚表面缺陷的种类、数量、深度与面积、体系势能、晶体结构变化等对加工表面质量的影响。研究结果表明:提高切削速度能够有效降低亚表面缺陷的数量与面积,改善加工零件的表面质量。
The generation and evolution of surface defects in the process of parts processing directly affect the surface quality and service life,which has always been the focus of attention in the business and academic fields.From the point of view of defect evolution and energy change,combining with molecular dynamics method,the evolution mechanism of subsurface defects in the cutting of nickel based single crystal Superalloy by using the silicon nitride ceramics tool was studied.The mixed potential function is used to describe the interatomic force in the cutting of nickel based single crystal Superalloy.The process of nucleation,propagation and transformation of various dislocations and stacking faults are analyzed.The influence of the type,quantity,depth and area of subsurface defects,system potential energy and crystal structure change induced by the change of cutting speed on the machined surface quality is discussed.The results show that to increase the cutting speed can effectively reduce the number and area of subsurface defects and improve the quality of machined parts.
作者
刘娴萍
郝兆朋
娄在祯
范依航
LIU Xianping;HAO Zhaopeng;LOU Zaizhen;FAN Yihang(School of Mechatronic Engineering,Changchun University of Technology,Changchun 130012,China)
出处
《机械科学与技术》
CSCD
北大核心
2022年第7期1062-1069,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金联合基金重点支持项目(U19A20104)
国家自然科学基金项目(51605043)
吉林省科技计划项目(20200201064JC)。
关键词
镍基单晶合金
亚表面质量
分子动力学
缺陷演化
位错滑移
nickel-based single crystal superalloy
subsurface quality
molecular dynamics
defect evolution
dislocation slip
作者简介
刘娴萍(1968-),本科,研究方向为机械制造及CAD/CAM技术,470704581@qq.com;通信作者:郝兆朋,副教授,博士生导师,hzp1911@163.com。
