Discussion on closing mechanism of TC10 alloy casting defects under HIP

作者：Wang X L^*; Zhao Z L; Zhang Y S; Zhao F L; Mao Q; Tian W H

来源：Foundry, 2011, 60(8): 731-734.

• Casting imperfection
• Creeping
• Diffusion
• HIP
• TC10 alloy

A TC10 alloy casting with defect was treated by HIP process at 940-950°C 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.

• 出版日期2011
• 单位西北工业大学