热处理工艺对钼金属板材组织和性能影响的研究进展

doi:10.11896/cldb.19080169

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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.

Key words： molybdenum alloy deformation heat treatment microstructure mechanical property

Published: 19 February 2021

CLC number:

TG146

Fund:This work was financially supported by the Key Projects of the National Key R&D Plan (2017YFB0305600, 2017YFB0306000), Shaanxi University Youth Innovation Team (2019—2022), Fok Ying Tung Education Foundation (171101).

About author:: Wenjing Chen received her B.S. degree in engineering from Xi'an University of Architecture and Technology in 2016. She is currently a master's degree student in materials engineering at Xi'an University of Architecture and Technology. She conducts research in powder metallurgy and pure molybdenum heat treatment under the guidance of Professor Hu Ping.
Ping Hu, born in January 1985, Ph.D., professor and doctoral supervisor of the Department of Materials Processing, School of Metallurgical Engineering, Xi'an University of Architecture and Technology. Selected as the Shaanxi Youth Science and Technology Star, the batch of “Outstanding Talents of Young People” in Shaanxi Province, and the top talents of Shaanxi High-level Talents Special Support Program, Xi'an Univer-sity of Architecture and Technology Batch of “Excellent Young Scholars” Yanta scholars. His research interests include high-perfor-mance powder metallurgy molybdenum alloys and nano-functional materials. He has presided over 15 national research projects, including the National Key Research and Development Program Subproject, the National Natural Science Foundation, and the China Postdoctoral Science Foundation. In Nano Research, J. Alloy Comp., Mater. Sci. Eng. A, Materials Letters and other domestic and foreign academic journals published more than 50 papers; autho-rized 38 invention patents in China, authorized 2 utility model patents; won a first prize of Science and Technology Award of Shaanxi Province and 2 the first prize of China Nonferrous Metals Industry Science and Technology Award.

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	CHEN Wenjing
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	XING Hairui
	XIA Yu
	LI Shilei
	ZUO Yegai
	WANG Kuaishe
	FENG Pengfa
	CHANG Tian
	LI Laiping

Cite this article:

CHEN Wenjing,HU Ping,XING Hairui, et al. Research Progress of the Effect of Heat Treatment Process on Microstructure and Properties of Molybdenum Sheet[J]. Materials Reports, 2021, 35(3): 3141-3151.

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http://www.mater-rep.com/EN/10.11896/cldb.19080169 OR http://www.mater-rep.com/EN/Y2021/V35/I3/3141

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