Research Status of Texture Evolution of As-rolled Molybdenum in Preparation Process
LI Yan1, ZHOU Zenglin1,2,3, HE Xueliang1, CHEN Wenshuai1,2,3, HUI Zhilin1
1 GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China 2 State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Corporation Limited, Beijing 100088, China 3 General Research Institute for Nonferrous Metals, Beijing 100088, China
Abstract: Compared with molybdenum alloys, the improvement of application performance of pure molybdenum rolled sheet, strip and foil is more focused on improving the purity of raw materials and optimizing the microstructure. In view of this, the texture formed by the preferential distribution of grain orientation during sintering, rolling and annealing process, should be paid more attention. While recent advances in texture analysis techniques, such as X-ray diffraction and electron backscatter diffraction, have provided sufficient support for more in-depth understanding on texture,relevant research of molybdenum texture is confined to texture state in a certain status, such as hot rolling, cold rolling or annealing. The literature on texture evolution of molybdenum materials in entire rolling and heat treatment process has not yet been published. The rolling and primary-recrystallizated texture of pure molybdenum sheet present typical texture components of impurity-free body-centered cubic metals, mainly including α-fiber components, such as {001}〈110〉 and {112}〈110〉,and γ-fiber ones, such as {111}〈110〉 and {111}〈112〉. Their formation has evolved as the following sequences: the existence of 〈100〉//ND, 〈110〉//ND, 〈112〉//ND or 〈113〉//ND texture in sintered molybdenum billet; the formation and enhancement of main texture components, {001}〈110〉 or {112}〈110〉, and γ-fiber ones during rolling process; enhanced {001}〈110〉 or {112}〈110〉, unchanged {111}〈110〉 and weakened {111}〈112〉 during partial recrystallization; the change of main texture components from {112}〈110〉 to {113}〈110〉 and {001}〈110〉 through full recrystallization. Based on the comparation of XRD and EBSD, this paper depicted the texture development of molybdenum material along the processing route for summarizing the relevant research work. In addition, the texture evolution of molybdenum was also compared with that of low carbon steel, which is also one of the most deeply researched BCC metals. This paper aims to provide a better understanding of texture evolution in this category of metals.
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2022, Vol. 36 
