Impact Properties and Fracture Analysis of TC18 Titanium Alloy Bars and Forgings

被引：0

作者：

Liu Y. ^{[1
]}

Zhang J. ^{[1
]}

Wang M. ^{[1
]}

Li J. ^{[1
]}

机构：

[1] School of Metallurgical Engineering, Xi'an University of Architecture & Technology, Xi'an

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2019年 / 43卷 / 08期

关键词：

Fracture surface morphology; Impact toughness; TC18; alloy;

D O I：

10.13373/j.cnki.cjrm.XY18060014

中图分类号：

学科分类号：

摘要：

The impact properties of longitudinal and transverse on TC18 titanium alloy bars and forgings and the morphology of the impact fracture surface were studied. The reasons for the difference in impact properties of the alloy with different microstructure were analyzed. The results showed that the macro fracture of the bar and the forging was similar, but the residual initial crystal alpha block and strip in the bar could not coordinate with the matrix under impact work, and could be easily separated from the matrix. When the hard initial crystal was in the sample, the crack was easily produced and expanded. The impact toughness of the forgings was higher in the longitudinal direction than that of the bar in longitudinal and transverse direction at room temperature, and the average was 15.2 J•cm-2 higher than that of the bar. By forging, the partially initial cast crystalline alpha phase particles and segregation in the bar could be broken, the distribution of the particles was uniform, thus promoting the cracks' zigzag degree of the path in the process and improving the fracture toughness of the material. In order to further understand the impact factors of impact performance, on the basis of traditional prediction of impact toughness model, the relationship model of fracture area and impact toughness was rebuilt by considering the size of specimen prefabricated gap and the elongation of material, and the consistency of the new model and the experimental data was compared. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：891 / 896

页数：5

共 16 条

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