Transactions of Materials and Heat Treatment

Title：Study on surface defects for cold rolled TA1 titanium strip

Authors： Zhang Mingyu Yun Xinbing Fu Hongwang

Unit： Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University

KeyWords： cold rolled titanium strip surface defect cracks inclusions hardness

ClassificationCode：TG337.6

year,vol(issue):pagenumber：2022,47(6):125-131

Abstract：

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.

Funds：

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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