GH4169高温合金端面车削表面变质层的形成机理  

Formation Mechanism of Surface Metamorphic Layer on Turning End Face of GH4169 Superalloy

作　　者：姚倡锋[1] 沈雪红 张定华[1] 

机构地区：[1]西北工业大学现代设计与集成制造技术教育部重点实验室,西安710072

出　　处：《航空材料学报》2017年第6期50-58,共9页Journal of Aeronautical Materials

基　　金：973项目资助

摘　　要：利用实验和DEFORM-3D有限元分析相结合的方法,通过分析不同加工参数下切削力、温度和应变场,以及残余应力、显微硬度、微观组织的变化,研究GH4169端面车削表面变质层的形成机理。结果表明:表面变质层的形成是热力耦合作用于材料微观组织的结果;加工强度增大,切削力和切削热增大,表层金属等效应变增大,塑性变形更加显著,金相组织改变越明显,晶粒变形程度越大;在加工参数范围内,温度影响层深度为130~200μm,等效应变层深度为100~220μm,残余应力层为80~110μm,硬化层深度为50~80μm,表面变质层深度为2.5~5μm。Turning experiments and Deform-3D finite element methods were used to study the formation mechanism of surface metamorphic layer on turning GH4169 processed.The investigations were carried out by analyzing the changing of cutting force,the temperature and strain field,the residual stress,micro-hardness,microstructure,as well as the distribution of the above all along the direction of the depth under various process parameters.The results show that the surface metamorphic layer is formed due to the thermal-mechanical coupled effects on the microstructure of the material in the machining process.The cutting force,heat and strain of surface material are increased with the increase of machining intensity.Besides the higher strength of machining,the greater changes of plastic deformation,metallographic and grain deformation are acquired.In the range of processing parameters,the temperature layer is 130-200 μm,the strain layer is 100-220 μm,the residual stress layer is 80-110 μm,the depth of hardening layer is 50-80 μm,and the depth of surface metamorphic layer is 2.5-5μm.

关 键 词：切削力 温度-应变分布 残余应力 加工硬化 微观组织 

分 类 号：TG51[金属学及工艺—金属切削加工及机床] TG146.15[一般工业技术—材料科学与工程]