摘要
对热等静压态FGH96合金进行热挤压变形,分析非金属夹杂物Al2O3和SiO2在热等静压和热挤压过程中的形貌特征与变形特性。结果表明:在热等静压和热挤压过程中,Al2O3夹杂与FGH96合金基体为机械结合,两者之间没有反应过渡区,而SiO2夹杂与FGH96合金基体中的铝和钛元素在高温和高压下发生化学反应,在基体与SiO2夹杂之间形成反应过渡区;FGH96合金挤压变形过程中,材料内部为三向压应力状态,在挤压方向非金属夹杂物被拉长成不连续的线状,在垂直于挤压方向,夹杂物投影面积减小;大挤压比的热挤压变形能有效破碎合金中的非金属夹杂物缺陷,细化合金晶粒,提高FGH96合金盘件的纯净度水平。
The morphology and deformationcharac terisitics of non-metallic inclusions Al2 O3 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 Al2 Oa has no reaction in FGH96 alloy and the transition zone between Al2 O3 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 in- clusions 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.
出处
《锻压技术》
CAS
CSCD
北大核心
2013年第6期132-137,共6页
Forging & Stamping Technology
