ZTA7钛合金铸件荧光显示分析  

Analysis of Fluorescent Display in ZTA7 Titanium Alloy Casting

作　　者：王丽娟 侯学勤 冯新 张光 Wang Lijuan;Hou Xueqin;Feng Xin;Zhang Guang(Beijing Baimtec Material Co.,Ltd.;AECC Beijing Institute of Aeronautical Materials;Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology)

机构地区：[1]北京百慕航材高科技有限公司,北京100094 [2]中国航发北京航空材料研究院 [3]北京市先进钛合金精密成形工程技术研究中心

出　　处：《特种铸造及有色合金》2021年第5期653-657,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2018YFB1106000,SQ2020YFB170204)。

摘　　要：分析了某航空发动机用ZTA7钛合金铸件在长试考核后形成荧光显示的原因。利用扫描电镜、金相显微镜对剖切后的铸件进行组织分析,并进行了氢含量检测。结果表明,铸件裂纹处断口呈脆性解理断裂特征,无明显氧化,裂纹源区未见缩松和夹杂等冶金缺陷,微裂纹区微观组织无异常,推断铸件本体不存在铸造缺陷,排除了铸造缺陷引起微裂纹解理开裂的可能。另外,对同批次、未试车的铸件进行荧光检测,在铸件机加工面上发现裂纹,证明微裂纹由机加残余应力导致。The origination of fluorescent displays in ZTA7 titanium alloy casting after long-term trial run was analyzed.The microstructure of castings after cutting was investigated by SEM,metallographic examination and hydrogen content test was carried out.The results indicate that the microcrack fractures are characterized by brittle cleavage without obvious oxidation and common defects,such as shrinkage and inclusion,in area of microcrack sources,and no abnormality occurs in the microcrack area.It can be inferred that there is absence of defect in casting,and possibility of microcrack cleavage caused by casting defect is excluded.In addition,cracks appear on the machine surface after fluorescent detection of untested castings in same batch,proving that residual stress leads to the microcracks.

关 键 词：ZTA7钛合金铸件 荧光显示 微裂纹 断口特征 残余应力 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG249.5[金属学及工艺—金属材料]