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.
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2019, Vol. 33 
