Transactions of Materials and Heat Treatment

Title：Deformation behavior of non-metallic inclusions of FGH96 alloy in extrusion process

Authors： ZHANG Min-cong FANG Shuang CHEN You-hong SUN Xing DONG Yun-peng WANG Shu-yun

Unit： Beijing Institute of Aeronautical Materials

KeyWords： FGH96 alloy non-metallic inclusion hot extrusion deformation behaviors

ClassificationCode：TG132.32

year,vol(issue):pagenumber：2013,38(6):132-137

Abstract：

The morphology and deformationcharac terisitics of non-metallic inclusions Al2O3 and SiO2 in the hot isostatic pressing process and the high-temperature extrusion process were analyzed by the hot extrusion deformation test of FGH96 alloy in the state of high-temperature isostatic pressing. The results show that Al2O3 has no reaction in FGH96 alloy and the transition zone between Al2O3 and FGH96 alloy is mechanical combination during the plastic deformation, whereas SiO2 reacts with aluminum and titanium in the environment of high temperature and high pressure. The reaction zone is formed in the interface between SiO2 and FGH96 alloy. In the extrusion process, the FGH96 alloy is situated in strong tri-axial pressure. The non-metallic inclusions are pulled into a discontinuous line in extrusion direction and areas of inclusions are constricted in the perpendicular of extrusion direction. In summary, the large extrusion ratio can break the non-metallic inclusions in FGH96 alloy effectively,refine the grain and improve the purity of FGH96 alloy plate.

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