热变形参数对Ti-17合金的片状α球化过程的影响  

Influence of Hot Processing Parameters on Globularization of Lamellar α in Ti-17 Alloy

作　　者：周军[1] 曾卫东[1] 舒滢[1] 周义刚[1] 

机构地区：[1]西北工业大学材料科学与工程学院

出　　处：《热加工工艺》2005年第1期16-18,41,共4页Hot Working Technology

摘　　要：通过等温热压缩试验和金相分析研究了热变形参数对Ti-17(Ti-5Al-4Mo-4Cr-2Sn-2Zr)合金片状α球化过程的影响。结果表明:合金组织由网篮组织转化为等轴α组织的球化过程引起了高温流变应力的软化;等轴化的程度随变形程度、应变速率的增加而增大,随变形温度的提高而减小;变形程度是片状球化的主要因素;在相同温度下,提高应变速率能够加快片状组织完全球化的速度。The effect of processing parameters on the globularization of lamellar α microstructure in Ti-17(Ti-5Al-4Mo-4Cr-2Sn-2Zr) alloy was studied by isothermal compression test and metallurgical analysis.The results show that the lamellar structure turns to the equiaxed α structure, the structure globularization causes flow stress softening;the globularization of lamellar α increases with increasing strain and strain rate, and decreases with increasing heating temperature; the deformation degree is the major factor of globularization and enhancing the strain rate can accelerate the speed of the globularization.

关 键 词：Ti-17钛合金 压缩试验 流动应力 球化 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG319[金属学及工艺—金属材料]