多道次轧制TC4钛合金微观组织与力学性能研究  

Microstructure and Mechanical Properties of TC4 Titanium Alloy Subjected to Multi-pass Warm Rolled

作　　者：徐勇[1,2] 杨湘杰[1] 乐伟[2] 杜丹妮[1] 

机构地区：[1]南昌大学机电工程学院 [2]南昌航空大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2017年第7期697-700,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51164030)

摘　　要：通过多道次轧制(两向轧制+单向轧制)制备了高强度TC4钛合金板材,比较分析了多道次轧制和单向轧制的TC4钛合金的室温力学性能和微观组织。结果表明,多道次轧制显著细化了晶粒尺寸,纳米级等轴α相呈弥散分布,平行轧制方向有少量链状及丝状α相;基体β相破碎,微米级β晶粒平行于轧制方向分布,呈现出一定的方向性,亚微米级β晶粒弥散分布。多道次轧制显著提高了TC4钛合金的室温力学性能,降低了其在轧向和横向上的各向异性。High strength TC4 titanium alloy plate was produced successfully by multi-pass warm rolling （two-direction rolling＋ single direction rolling）. Mechanical properties and microstructure of as-multi- pass rolled and as-unidirection rolled TC4 titanium alloy were analyzed comparatively. The results show that the multi-pass rolling can refine significantly the grain size with dispersed distribution of nanoscale equiaxed a phase, and along the rolling direction, a small amount of the chain and filamentous a phase can be observed. Matrix ~ phase is broken, and micro-size/~ grain is parallel to the rolling direction, showing a certain degree of orientation, with dispersed distribution of the sub-micron-size fl grain. The room temperature mechanical properties of TC4 titanium alloy were improved significantly after multi- pass rolling. In addition, the anisotropy of mechanical properties is relieved, and the difference in tensile strength and elongation between the rolling direction and transverse direction is decreased greatly.

关 键 词：多道次轧制 TC4钛合金 力学性能 微观组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]