Ti-6Al-4V合金的温轧织构演变

Texture evolution in warm rolled Ti-6Al-4V alloy

摘要:

本研究采用取向分布函数(ODF)详细分析了具有等轴组织的Ti-6Al-4V热轧退火板在450℃、600℃和750℃下经过~45%的温轧压下量后沿层厚的宏观织构演变。结果表明采用多道次温轧的方法成功获得可改善Ti-6Al-4V合金力学性能各向异性的纤维织构ND//和基面织构(0001)[2-1-10]或(0001)[1-210]。而且,轧板通体上均形成了ND//纤维织构,中心层的横向织构(-12-10)[10-10]随轧制温度而变化,表层的基面织构通过位错滑移累积剪切应变而产生,且基面织构的形成路径依赖于初始取向。

Abstract:

Through-thickness macrotexture evolution of Ti-6Al-4V hot-rolled and annealed sheet was warm rolled to about 45% reduction at temperatures of 450oC, 600oC and 750oC, and was analyzed using orientation distribution function(ODF) in the study. The results show that the ND// fiber texture and the basal texture (0001)[2-1-10] or (0001)[1-210] , which can improve the mechanical property anisotropy of Ti-6Al-4V alloy, can be obtained by multipass warm rolling successfully. Moreover, the ND// fiber texture is developed in the bulk sheet, and the transverse texture (-12-10)[10-10] in the center layer varies with rolling temperature, whereas the basal texture in the surface layer is formed by accumulated shear strain from dislocation slip and its formation depends on initial orientation.