TC10合金铸造缺陷在热等静压条件下的弥合机理初探  

Discussion on Closing Mechanism of TC10 Alloy Casting Defects Under HIP

作　　者：王晓林[1] 赵志龙[2] 张延生[1] 赵芳利[1] 毛麒[1] 田伟华[1] 

机构地区：[1]宝钛集团有限公司,陕西宝鸡721014 [2]西北工业大学,陕西西安710061

出　　处：《铸造》2011年第8期731-734,共4页Foundry

摘　　要：对一处已知的TC10合金封闭的铸造缺陷进行940～950℃、120-130MPa、保温3～3．5h条件下热等静压处理，然后对原缺陷部位进行了金相分析，发现弥合界面依然存在，为断续的黑色线状区域，因此对黑色区域做了扫描电镜．能谱（SEM－EDAX）分析，通过对比该区域与铸件本体化学成分，发现这些黑色区域并非杂质元素聚集的孔洞，而是合金元素不均匀的区域。分析认为，热等静压条件下铸造缺陷的弥合是一个蠕变、扩散连接的过程，当压力高于处理温度下的金属蠕变强度时，封闭的缺陷逐步弥合，时间越长弥合效果越好。A TC10 alloy casting with defect was treated by HIP process at 940-950 ℃ and 120-130 MPa for 3-3.5 h. Microstructure of the defect was analyzed. Results show that the closing interface that is black and incontinuous line-like still remains. The black interface was observed by SEM-EDAX. Through comparing the composition between the matrix and the interface, it was revealed that the black interface was not cavities enriched in impurities, but a nonuniform interface of alloy elements. The analysis results show that the closing mechanism of casting defect in HIP is a creeping and diffusion process. When the pressure is higher than the metal creeping strength at a certain temperature, the defects are closed gradually. The longer the holding time is, the better the closing results are.

关 键 词：铸造缺陷 钛合金 热等静压 蠕变 扩散 

分 类 号：TG292[金属学及工艺—铸造]