Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-6Al-4V-1.5Mn Fabricated by Powder Metallurgy

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JMEPEG https://doi.org/10.1007/s11665-019-04257-y

Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-6Al-4V-1.5Mn Fabricated by Powder Metallurgy Ji-yao Liu, Wen-yan Wang, Ya-bo Huang, Jing-pei Xie, Wen-jun Huang, and Shi-qin Shi (Submitted August 10, 2017; in revised form July 2, 2019) Ti-6Al-4V-1.5Mn alloy was prepared by powder metallurgy and solid solution aging treatment. Effect of composition segregation on properties of the titanium alloy was eliminated, and microstructure and the mechanical properties of the alloy were studied. Results show that the microstructure of Ti-6Al-4V-1.5Mn is composed of homogeneous a + b phase, and the optimal mechanical properties of the alloy are obtained when the solution temperature is 950 °C and the aging temperature is 460 °C. Analysis of the fracture illustrates that a small amount of dimple was found in the section and the fracture of the material was quasi-cleavage fracture. Keywords

microstructure, solid solution aging, tensile strength, Ti-6Al-4V-1.5Mn alloy

1. Introduction Titanium alloy is widely used in national defense and other industries, due to its high strength, good corrosion resistance and good creep resistance under high temperature (Ref 1-3). It has many properties: low density, high specific strength, good oxidation resistance and good high-temperature mechanical properties, which has good use of the prospects of titanium alloy (Ref 4-8). Industrial production of TC4 titanium alloy is difficult to precisely control its organization and performance. The titanium alloy needs the heat treatment process to control the organization of the material and get the required performance. For TC4 alloy, a-phase transforms to b-phase when temperature is between 890 and 1000 C. Therefore, heat treatment can improve the content of a-strengthening phase in the titanium alloy. a + b type titanium alloy possesses astable elements, as well as b-stable elements. Heat treatment enhances the content of a-phase and b-phase at the same time. In order to obtain the sufficient number of b-phase, 4-6% bstable element was added in the alloy to improve the alloyÕs forming plastic by strengthening the heat treatment. It is shown that the a + b titanium alloy improves its mechanical properties after heat treatment (Ref 9, 10).

Ji-yao Liu, Wen-yan Wang, Ya-bo Huang, Jing-pei Xie, Wenjun Huang, and Shi-qin Shi, Henan University of Science and Technology, Material Science and Engineering, Luoyang 471003, Henan, China; and Collaborative Innovation Center of Nonferrous Metals Henan Province, Luoyang 471003, Henan, China. Contact e-mail: [email protected].

Journal of Materials Engineering and Performance

Mn element can improve the tensile strength and elongation of TC4 alloy. In the previous experiment, we have got the optimal addition of Mn in TC4 alloy. In this paper, the tensile strength and elongation of Ti-6Al-4V-1.5Mn alloy were improved by solid solution aging. The effects of solution aging treatment on the microstructure and mechanical properties of Ti-6Al-4

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