摘要:
利用现有轧钢设备轧制纯钛板坯,借助光学显微镜研究轧坯的组织形貌,发现轧制钛坯材料的头部与尾部微观组织形貌变化情况相同,即心部组织为锯齿状α片群,α片间还保留少量β相,角部微观组织基本是等轴晶粒,侧边中间位置均为变形α晶粒,且晶粒大于角部、小于心部。透射电镜分析发现轧制钛坯微观组织中出现大量位错,α晶粒内有较多的析出相和孪晶组织,但未见板条状结构。X射线衍射分析表明轧制变形过程中出现了较强的变形织构。沿平行和垂直于轧制方向的取样拉伸,结果发现纯钛坯横向平均屈服强度和抗拉强度高于纵向。
Abstract:
The commercial pure titanium slabs were rolled using current rolling device,microstructure and morphology at the head and end of these slabs were studied by optical microscope,and results show that microstructure and morphology of the head are similar to ones of the end,i.e.having a little retained β phase in the serrated lamella of α phase in core microstructure,the smallest equiaxed grains in the four corners' microstructure,smaller deformed α grains in the middle part microstructure of the slab surface.TEM analyses showed that a lot of dislocations and more precipitated phases and twins microstructure,but no any lath distributing structure,occur in α phase of the rolling microstructure.It is found by XRD that stronger deformation texture occurs in rolling microstructure.Both the transverse and longitudinal tensile properties of rolled slab were tested in this paper.Transverse yield strength and tensile strength of slab are stronger than those of longitudinal direction.
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