Research Progress of the Effect of Heat Treatment Process on Microstructure and Properties of Molybdenum Sheet
CHEN Wenjing1,2, HU Ping1,2, XING Hairui1,2, XIA Yu1,2, LI Shilei1,2, ZUO Yegai1,2, WANG Kuaishe1,2, FENG Pengfa3, CHANG Tian4, LI Laiping4
1 School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2 National and Local Joint Engineering Research Center for Functional Materials Processing, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3 Jinduicheng Molybdenum Co., Ltd., Xi'an 710077, China; 4 Northwest Institute for Non-ferrous Mental Research, Xi'an 710016, China;
Abstract: Molybdenum is a hard and tough refractory metal with the melting point is up to 2 620 ℃. It has good corrosion resistance, creep resistance and thermal shock resistance and is widely used in the aerospace, nuclear industry and electronics industry. Molybdenum and molybdenum alloys are usually prepared by powder metallurgy, which can avoid the complicated process of traditional preparation and ensure the composition and quality of molybdenum and molybdenum alloys. Due to its body-centered cubic structure and high plastic-brittle transition temperature, molybdenum and molybdenum alloy molding and processing are severely restricted, and the economic benefit transformation from resources to molybdenum products is severely restricted. Forging and rolling are often used in the forming process, but serious work hardening can be caused. Heat treatment process can simply and effectively improve the residual stress, work hardening and other adverse effects of molybdenum metal in the process of processing, and improve the quality and performance of products. During the deformation process of molybdenum alloy, {111}<uvw> texture will be generated in unidirectional rolling. At a high deformation amount, the texture will be deflected to {112}<110>. The {100}<uvw> texture tends to be in cross rolling. After annealing treatment at 1 200 ℃, all the molybdenum alloy plates with rolling deformation of 40%—90% will complete recrystallization. When the temperature is above 1 250 ℃, the grain size will be larger, and the texture <110> will exist in both unidirectional rolling texture and texture transformation during recrystallization. At a faster heating rate (>100 K/min), the grain size of the molybdenum alloy is finer. Molybdenum doped with Ti, Zr, La and other elements will form carbides or oxides at sub-grain boundaries or grain boundaries, change the microstructure, and raise the recrystallization temperature. After heat treatment, the fracture mode changed from brittle fracture to ductile cleavage fracture, which improved the comprehensive mechanical pro-perties. In this paper, the effects of deformation and heat treatment process parameters on the microstructure and properties of pure molybdenum and molybdenum alloy sheets are studied. Through its research, it provides theoretical guidance for the process of simplifying and effectively producing high-quality molybdenum sheet, and reduces the heat treatment energy consumption, which is helpful to develop green heat treatment, and puts forward the prospect of future molybdenum sheet heat treatment research.
陈文静, 胡平, 邢海瑞, 夏雨, 李世磊, 左烨盖, 王快社, 冯鹏发, 常恬, 李来平. 热处理工艺对钼金属板材组织和性能影响的研究进展[J]. 材料导报, 2021, 35(3): 3141-3151.
CHEN Wenjing, HU Ping, XING Hairui, XIA Yu, LI Shilei, ZUO Yegai, WANG Kuaishe, FENG Pengfa, CHANG Tian, LI Laiping. Research Progress of the Effect of Heat Treatment Process on Microstructure and Properties of Molybdenum Sheet. Materials Reports, 2021, 35(3): 3141-3151.
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