Discussion on determination method of primary α phase in titanium alloy
YUAN Shaohong1,2, SONG Wencheng1,2, WANG Jun1,2, ZHONG Juan1,2, WANG Yandong1,2
1. Hang Xin Material Technology Co.,Ltd., Yantai 265700, China; 2. National Engineering Research Center of Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co.,Ltd., Yantai 265700, China
Abstract：Four methods for the testing of primary α phase content in titanium alloy are provided in Appendix E of GB/T 5168-2020, including picture comparison method, intersection method, intercept method, and image analysis method. The standard has not yet given a preferred method for use. Ti-6Al-4V titanium alloy was taken as an example. By analyzing and comparing four testing methods, the image analysis method was finally recommended as the method for the testing of primary α phase in titanium alloy. Moreover, the detailed testing steps were provided to enhance the operability. Under the magnification of 500 times, 5 fields of view were selected. AxioVision Rel.4.8 software of "single sample measurement" was selected to ensure that the contour boundary of each primary α phase was clear and complete after being painted, which could maximize the test accuracy of primary α phase content.
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