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Abstract:The room temperature mechanical properties of TA15 titanium alloy thin profiles which prepared by "direct hot extrusion"(DE) and "hot extrusion + pulse forging"(EF) process were studied by tensile test. The distribution regulation of tensile strength and yield strength were obtained by using the samples cut from different locations of profile. Then,the regulation of data distribution was analyzed. The results show that the values of tensile strength and yield strength distribute more scattered and the dispersion coefficient is larger than 3. 5% for DE profiles; By contrast,their distribution are more homogeneous and concentrated for EF profiles. Among different production lots,its distribution of test data is consistent and the dispersion coefficient is lower than 3%. By further analysis,the performance difference between two type profiles is related to surface states,fine grain layer and section size. Pulse forging process can uniform the thickness of fine grain layer and regulate section size,which are benefit for improving mechanical performance of the profile.
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|Zhang Mingjie;Qi Lichun;Huang Lijun;Li Xuefei;Li Huanfeng;AECC Beijing Institute of Aeronautical Materials;|