镍基单晶高温合金DD5铣削表面完整性及亚表面微观组织  

Milling Surface and Subsurface Microstructure of Nickel-Based Single Crystal Superalloy DD5

作　　者：张唤 巩亚东[1] 梁春游 孙竟毓 何竹风 Zhang Huan;Gong Yadong;Liang Chunyou;Sun Jingyu;He Zhufeng(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819 [2]东北大学材料科学与工程学院,辽宁沈阳110819

出　　处：《稀有金属》2024年第8期1063-1072,共10页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(U1908230);中国博士后科学基金面上项目(2022M720676)资助。

摘　　要：为探究铣削加工对镍基单晶高温合金DD5表面完整性的影响,采用单因素实验方法对加工后DD5表面粗糙度、表面形貌及亚表面微观结构进行了系统分析。结果表明,高切削速度、低进给速度及低切削深度有利于加工后DD5表面质量的提高,切削液的使用显著缓解了加工表面的损伤。与传统多晶高温合金相比,DD5因其超高的强度、硬度和单晶的特征导致加工后表面粗糙度相对较差,但对后续的磨削加工和抛光不会造成不利影响。此外,铣削加工后DD5亚表面的微观结构由塑性变形层和加工硬化层组成,且其尺度不影响材料的宏观性能。研究结果将为镍基单晶高温合金的铣削加工提供研究基础,为加工质量的提高提供技术支持。Nickel-based superalloy have been widely used in the key high-temperature components of aeroengines,such as working blades,turbine disks,combustion chambers and so on,due to their excellent oxidation resistance and corrosion resistance,low thermal conductivity and good comprehensive mechanical properties in high-temperature environment.Because of the huge industrial value,nickel-based superalloy has attracted people’s extensive attention since it came out.After decades of development,nickel-based single crystal superalloy has emerged and become a key material for advanced aeroengine and gas turbine blades depend on its ultrahigh strength/hardness and high temperature stability.After more than 40 years of development,people have successively developed five generations of nickel-based single crystal superalloys,and countries all over the world pay close attention to the development of relevant industries.However,nickel-based single crystal alloy is a typical difficult to machine material,which greatly limits its extensive industrial application.At present,the research on nickel-based single crystal superalloy is mainly focused on grinding and micromachining,and some achievements have been made.But there is little research on milling of nickel-based single crystal superalloys.Compared with grinding and micro-machining,milling has the advantages of high efficiency and low cost.Based on this,in order to fill the blank in the research field of milling on nickel-based single crystal superalloys,the second generation nickel-based single crystal superalloy DD5 was selected as the research object in this work.Surface roughness(Ra),surface morphology,and subsurface microstructure of nickel-based single crystal superalloy DD5 after milling were investigated by single factor experiments using machining center,3D profilometer,3D laser confocal microscope and field-emission scanning electron microscope.The results showed that surface roughness of DD5 workpiece after milling first decreased from 2.968 to 2.170μm and then incr

关 键 词：镍基单晶高温合金DD5 铣削 表面完整性 亚表面 

分 类 号：TG146[一般工业技术—材料科学与工程]