旋锻Mo-Ti-Zr合金棒材的退火行为  

Annealing behavior of rotary forging Mo-Ti-Zr alloy bars

作　　者：罗明[1] 范景莲[1] 成会朝[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2010年第5期866-871,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家杰出青年科学基金资助项目(50925416);国防军工新材料资助项目(JPPT-115-2-662)

摘　　要：采用冷等静压、高温烧结和直接高温旋锻的方法制备Mo-Ti-Zr合金棒材,研究不同退火温度对合金力学性能与显微组织的影响以及对断面收缩率为30%的旋锻Mo-Ti-Zr合金棒材的退火行为。结果表明:当退火温度低于1000℃时,随着退火温度的升高,Mo-Ti-Zr合金硬度未急剧下降,抗拉强度和伸长率逐渐提高;经900℃退火后,合金抗拉强度达到669MPa,伸长率达到3.1%,获得良好的综合力学性能;当退火温度在800～1000℃范围内时,Mo-Ti-Zr合金晶粒发生再结晶细化;旋锻态Mo-Ti-Zr合金的断口主要为穿晶解理断裂,随着退火温度的提高,出现较多细晶粒的穿晶断裂和沿晶断裂。The Mo-Ti-Zr alloy bars were prepared by cold isostatic pressing,high temperature sintering and direct rotary forging.The effects of the annealing temperature on the mechanical properties and microstructure of the alloy and the annealing behavior of this rotary forging Mo-Ti-Zr alloy bars deformed by 30% were investigated.The results show that,with increasing annealing temperature before 1 000 ℃,the hardness of the Mo-Ti-Zr alloy bars decreases slowly whereas the tensile strength and elongation increase.The tensile strength and elongation reach 669 MPa and 3.1%,respectively,at 900 ℃.The recrystallization of the Mo-Ti-Zr alloy bars occurs and the grains are refined at the annealing temperature of 800-1 000 ℃.For the rotary forging Mo-Ti-Zr alloy bars,its fracture is mainly a transcrystalline fracture type.The mixed type of transcrystalline fracture and intergranular fracture in the refined grains increases with increasing annealing temperature.

关 键 词：Mo-Ti-Zr合金 冷等静压 高温烧结 旋锻 退火 再结晶 

分 类 号：TF125.2[冶金工程—粉末冶金]