鈦合金粉末熱等靜壓近凈成形研究進展

鈦合金粉末熱等靜壓近凈成形研究進展Progress in hot isostatic pressing technology of titanium alloy powder

簡述了近年來國內外鈦合金粉末熱等靜壓近凈成形的研究現狀和應用進展情況，從典型低溫鈦合金研制、高溫鈦合金研制、鈦鋁金屬間化合物研制、粉末致密化的有限元仿真4個方面對中國科學院金屬研究所在鈦合金粉末冶金近凈成形領域的主要研究進展加以簡要介紹，并對該技術未來的發展趨勢進行了展望。

The research status and application of powder metallurgy (PM) titanium alloys in connection with near net shaping technology using hot isostatic pressing (HIP) are reviewed in this paper. A brief summary of historic developments with production of clean prealloyed powder and the use of computer simulation techniques in powder densification as important milestones is presented first. The bulk of the paper is concerned with progress made in the last 15 years, especially in the last decade, citing examples from the authors’ group. Four types of alloys are covered: A cryogenic titanium alloy, Ti-5Al-2.5Sn ELI, which is used to make impeller for hydrogen pump of rocket engine, a high temperature titanium alloy Ti55, which is intended for long term service at 550?C in engine applications, and two Ti-Al based intermetallic compounds including both gamma titanium aluminide and an orthorhombic alloy based on Ti2AlNb. Comparisons in mechanical property were made between the PM alloys and their wrought and cast versions wherever possible. Key issues influencing densification, such as powder size segregation and gas pores in large powders, variation in powder surface oxygen content with powder store time, oxygen layer on gamma titanium aluminide powder surface due to abnormally high fraction of the α2-Ti3Al phase as a result of rapid solidification of the powder, were discussed. The final section is dedicated to finite element modelling of powder densification, taking into account such factors as tooling design and stress shielding effect during HIPing. Future research directions are suggested in the summary section.

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