TC17钛合金整体叶盘叶片缺陷形成原因分析及检验方法
Cause Analysis and Inspection Method of TC17 Titanium Alloy Integral Blisk Blade Defects
刘丽玉 1高翔宇 1刘荣 2孟庆通3
作者信息
- 1. 中国航发北京航空材料研究院, 北京 100095;航空材料检测与评价北京市重点实验室, 北京 100095;中国航空发动机集团材料检测与评价重点实验室, 北京 100095;航空工业失效分析中心, 北京 100095
- 2. 西安航空动力股份有限公司, 陕西 西安 710021
- 3. 宝钢特钢有限公司, 上海 200940
- 折叠
摘要
对TC17钛合金整体叶盘叶片低倍缺陷进行了形貌观察,对微区成分、金相组织以及硬度进行了分析,并对缺陷的来源以及其对基体产生的影响进行了研究.结果表明:整体叶盘叶片的低倍腐蚀缺陷为非正常的组织缺陷.这类组织缺陷的产生是由于钛合金叶盘在铸锭生产过程中,误用YG8刀头对铸锭进行平头,出现粘刀现象导致钨钢刀头嵌入铸锭头部平头处,引入W合金夹杂.W合金夹杂的存在导致缺陷区组织出现细晶以及隐针马氏体等异常组织,硬度急剧升高,同时与基体产生相当大的组织过渡区.由于此类W合金夹杂以颗粒状或几十微米的团聚状存在,并沿锻造流线弥散分布,无法通过X射线和超声等无损检测方法将夹杂缺陷检出,可通过常规钛合金低倍腐蚀或金相法检验.
Abstract
The morphology of the low-magnification defects of TC17 titanium alloy blisk blades was observed,the micro-zone composition,metallographic structure and hardness were analyzed,and the source of the defects and the impact on the substrate were studied.The results show that the low-magnification corrosion defects of the blisk blades are abnormal microstructure defects.Such structure defects are caused by the wrong flattening of the YG8 cutter head of the titanium alloy blisk blade during the ingot production.The sticking phenomenon causes the tungsten steel cutter head to be embedded in the flat tening head of the casting ingot,and W alloy inclusions are introduced.The presence of W alloy inclusion leads to the appearance of fine crystals and abnormal structure such as hidden needle martenite,and the hardness sharply increases,and it also has a significant transition layer with the substrate.Since such W alloy inclusions exist in the form of particles or agglomerations of tens of microns,and are dispersed along the forging streamline,they cannot be detected by non-destructive testing methods such as X-ray and ultrasonic tests,but can be detected by low magnification corrosion or metallographic method inspection for conventional titanium alloys.
关键词
TC17/钛合金/腐蚀/硬质夹杂/组织/影响层Key words
TC17 titanium alloy/corrosion/hard inclusion/microstructure/affecting layer引用本文复制引用
出版年
2024
NETL
NSTL
万方数据