损伤容限型钛合金的切削加工性  

Cutting Machinability for Damage-Tolerant Titanium Alloy

作　　者：孙涛[1,2] 傅玉灿[1] 何磊[1] 陈雪梅[3] 张文光[3] 陈伟[3] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]徐州工程学院机电工程学院,徐州221111 [3]中航工业成都飞机工业(集团)有限公司,成都610092

出　　处：《上海交通大学学报》2016年第7期1017-1022,共6页Journal of Shanghai Jiaotong University

基　　金：江苏省普通高校研究生科研创新计划项目(CXLX12_0139);中央高校基本科研业务费专项资金(CXLX12_0139)资助

摘　　要：为提高损伤容限型钛合金TC21的加工效率和已加工表面质量，通过切削力、切削温度和刀具磨损试验，分析了TC21的切削加工性和已加工表面完整性．结果表明：TC21较高的强度、硬度、冲击韧性和较低的断面收缩率、导热率等物理特性，与其网篮结构的金相组织共同作用，导致TC21的切削力和切削温度较高，造成TC21的切削加工性逊于TC4；在推荐切削参数下切削TC21，表面粗糙度Ra=0．4～0．87μm，表层金相组织未发现明显的晶粒变形，硬化层深度低于30μm，硬化程度小于15％．To improve efficiency and machined surface quality of damage-tolerant titanium alloy TC21, cut- ting machinability and machined surface integrity of TC21 were studied by experiments of cutting force, cutting temperature and tool wear. The research results show that the strength, hardness and impact toughness of TC21 are higher but the contraction of cross sectional area and thermal conductivity are lower than TC4. For TC21, these physical characteristics and basketweave microstructure＇ act together in conse- quence that the cutting force and temperature of TC21 are higher so that the cutting machinability of TC21 is worse than that of TC4. Finally, using recommended parameters to cut TC21, the variation of surface roughness is 0.4 to 0.87μm, the obvious grain deformation is not observed in metallographic structure of the surface layer, the hardness depth is below 30 μm, and the degree of work hardening is less than 15%.

关 键 词：损伤容限型钛合金 切削加工性 表面完整性 

分 类 号：TG506.1[金属学及工艺—金属切削加工及机床]