Nondestructive Texture Measurement of As-Received Ti Alloy Tubing via Simultaneous Shaping and Tilting Defocusing Correc
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Nondestructive Texture Measurement of As-Received Ti Alloy Tubing via Simultaneous Shaping and Tilting Defocusing Correction Lihong Yuan, Mengyao Yang, Yun Li, Wenrui Wang, Hui Zhang, and Wangfeng Zhang (Submitted January 3, 2020; in revised form August 10, 2020; published online August 20, 2020) During the traditional process of texture testing, the sample to be tested must be flat. Generally, it is quite complicated and difficult to prepare the texture sample for the x-ray diffraction examination since it usually adopts time-consuming corrosion flattening or slice sticking for tubing. In this work, a new method is proposed to measure the texture of curved tube directly by using Eulerian Cradle installed on the x-ray diffractometer. This nondestructive method is favorable for a special defocusing correction sample composed of pure Ti powders with the same curvature radius as that of the tested Ti alloy tubing, and can be used to correct the strength loss caused by the elongated x-ray spot during the tube testing. It is verified that this nondestructive testing method is valid and feasible as compared to the traditional corrosion flattening method of tubing texture measurement. Moreover, this nondestructive testing method is highly effective, more accurate, and time-saving, which can be used for the rapid texture measurement for Ti alloy tubes. Keywords
nondestructive, ODF, texture measurement, Ti alloy tubing, x-ray diffraction
1. Introduction Ti alloy and Zr alloy tubing are usually manufactured by plastic deformation processes such as rolling, drawing, and extrusion (Ref 1-3). Owing to the hcp crystal structure and the limited slip systems during the formation, grains are deformed in a synergetic mode and aligned to a preferred orientation to cause the formation of the texture (Ref 4). Due to the anisotropy of crystal structure, the crystal structure of metal materials will cause the anisotropy of macroscopic properties (Ref 5-7). For Zr alloy and Ti alloy, they present inherently anisotropic physical, mechanical, and chemical properties with the existing texture. The texture of Ti alloy tubes as well as Zr tubes is very important for the design and applications in the hydraulic system of aerospace and cladding materials of nuclear industry. For the Ti-3Al-2.5V seamless hydraulic tubing, it is generally fabricated by cold rolling. The crystals in the tubing may be oriented in a ‘‘tubing radial’’ direction opposed to the ‘‘tubing tangential’’ or ‘‘random’’ direction when the appropriate Q value (the ratio of thickness reduction to diameter reduction) is adopted during cold rolling process. Tubing with radially oriented crystals has better fatigue properties than that Lihong Yuan and Mengyao Yang have contributed equally to this work. Lihong Yuan, Mengyao Yang, Yun Li, Wenrui Wang, and Hui Zhang, Department of Materials Physics, School of Science, XiÕan Jiaotong University, XiÕan 710049 Shaanxi, PeopleÕs Republic of China; and Wangfeng Zhang, Aero Engine Corporation of China Beijing
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