粉末钛合金热等静压近净成形技术及发展现状

doi:10.11896/cldb.17120236

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Abstract As one of the ideal fabrication processes of titanium alloy components,HIP near-net shaping technology of titanium alloy powders has aroused enormous interests in the field of military industry because it is able to improve the utilization efficiency of materials, reduce the production cost and shorten production cycle of titanium alloy products. Since the emergence of this process, researchers have performed systematic studies from the preparation of raw material powders, design of canning, procedure of near-net shaping to the post-treatment of materials, aiming at revealing the mechanism of the technology and influencing factors of materials property, and further achieving products with higher performance and lower production cost.
According to previous research results, the raw material powders and canning design constitute the major influencing factors on the qualities of the powder metallurgical (P/m) products. Titanium alloy powders with high sophericity and good fluidity show favorable filling property and high apparent density, which contribute to the forming precision of the products. meanwhile, as a key factor to control the structure, voids and impurities in P/m products, high quality titanium powders are conducive to acquiring products with high performance. Nevertheless, high price of this kind of powders will raise the production cost of P/m products for the high price. Consequently, preparing titanium alloy powders with high quality and low cost is one of the most important study directions for the future development of P/m titanium alloys. Besides, appropriate materials selection and structure design of canning, one of the major components, can not only improve the forming precision but also enhance the surface quality of the P/m products. moreover, the application of the computer simulations on the canning design and forming process could further improve the forming precision and reduce the R&D costs; as a result, computer simulation has become the focus of the future development of HIP near net shaping of titanium alloy. By selecting suitable raw material powders, designing reasonable canning and controlling the forming process accurately, the P/m Ti products obtained by HIP near-net shaping technology exhibit equivalent mechanical properties compared to the forging titanium alloys, with a more than 33% cost reduction. In recent years, P/m titanium alloy products by HIP technology have been extensively applied in foreign military fields like aerospace, achieving obvious effect of weight and cost reduction. While, it owns limited application in aerospace fields at home, and its fatigue performance is still questioned by the domestic aircraft industry.
The scope of this article is to review the near-net shaping of titanium alloy powders by HIP technology, elaborating the influence factors of the formation process, densification mechanism and mechanical properties of the P/m products etc. meanwhile, the computer simulation for the HIP near net shaping process is also introduced. Finally, the application of this technology at home and abroad is summarized, and its development trend is proposed.

Key words： titanium alloys powder metallurgy hot isostatic pressing near-net shaping

Published: 10 April 2019

CLC number:

TG146

Fund:This work was financially supported by Pre-research Project of General Armament Department

About author:: Zhongwei Yin received his master's degree from Harbin Institute of Technology at July 2008. He is vice-director of Special metal materials and Technology Department, Aerospace Research Institute of materials and Processing Technology, as a senior engineer. His research has focused on advanced metal materials and forming processing technology for aerospace. He has won National Defense Science and Technology Progress Awards for two times and published more than 10 academic papers.Yanbo Sun received his Ph.D. degree in materials Science from Beihang University in 2015. He is currently working in Special metal materials and Technology Department, Aerospace Research Institute of materials and Processing Technology, as an engineer. His research interests are in powder metallurgy of titanium alloys and refractory metal, as well as spin forming technology of refractory metals.Xuhu Zhang received his Ph.D. degree in material processing from Northwestern Polytechnical University. He is director of Special metal materials and Technology Department, Aerospace Research Institute of materials and Processing Technology, as a research fellow and assistant chief engineer. His research interests include advanced lightweight and high strength metals such as aluminum, magnesium and titanium alloys, as well as their processing technology. meanwhile, he is taking part in the research and development of multiple weapon models. He has won Na-tional Defense Science and Technology Progress Awards for four times and published academic papers more than 50.

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Cite this article:

YIN Zhongwei,SUN Yanbo,ZHANG Xuhu, et al. Near-net Shaping of Titanium Alloy Powders by HIP Technology: a Review[J]. Materials Reports, 2019, 33(7): 1099-1108.

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http://www.mater-rep.com/EN/10.11896/cldb.17120236 OR http://www.mater-rep.com/EN/Y2019/V33/I7/1099

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