锻压技术

冷轧TA1钛带材表面缺陷研究

英文标题：Study on surface defects for cold rolled TA1 titanium strip

作者：张明玉运新兵伏洪旺

分类号：TG337.6

出版年,卷(期):页码：2022,47(6):125-131

摘要：

针对冷轧TA1钛带材的表面缺陷，通过OM、SEM、EBSD以及维氏硬度测试来研究表面缺陷的形貌、组织和性能，分析缺陷产生的原因。结果表明：缺陷宏观表现为雪花状色差，其最大宽度为542 μm，最大高度为136 μm，位于钛带材两面，无明显对称性和周期性，且垂直于轧制方向。缺陷处裂纹内部有类似夹杂物存在，主要为Fe-Ti-O、Mg-Al-Si-O-Ti及TiC等颗粒组成的3种形态分布的物相。缺陷处晶粒的取向分布相对均匀，关键取向为<0001>//ND及<10-12>//ND，占比分别达到33.7%及21.3%。缺陷位置浅表层10~30 μm范围内存在短线状裂纹缺陷。缺陷部位与非缺陷部位的金相组织一致，显微硬度平均值分别为135.5和105.5 HV。且经分析得出裂纹产生的主要原因为内部夹杂物。

For the surface defects of cold rolled TA1 titanium strips, the morphology, microstructures and properties of surface defects were studied by OM, SEM, EBSD and Vickers hardness tests, and the causes of defects were analyzed. The results show that the macroscopic performance of the defects is snowflake color difference with the maximum width of 542 μm and the maximum height of 136 μm, which is located on both sides of titanium strip without obvious symmetry and periodicity and is perpendicular to the rolling direction. There are similar inclusions in the crack at the defect position, which are mainly the phases which are distributed in three forms composing of Fe-Ti-O, Mg-Al-Si-O-Ti and TiC particles. The grain orientation distribution at the defect position is relatively uniform, and the key orientations are <0001>//ND and <10-12>//ND, accounting for 33.7% and 21.3%, respectively. There are short linear crack defects in the superficial layer of defect position within range of 10-30 μm. The metallographic organization of the defective part are the same as that of the non-defective part, and the average values of microhardness are 135.5 and 105.5 HV respectively. After analysis, it is concluded that the main reason for cracks is internal inclusions.

基金项目：

国家自然科学基金资助项目（51675074）；辽宁省教育厅资助项目（JDL2019001）

张明玉 (1989-)，男，博士研究生 E-mail：251826123@qq.com 通信作者：运新兵 (1969-)，男，博士，教授 E-mail：yunxb@djtu.edu.cn

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