Transactions of Materials and Heat Treatment

Title：Effect of holding time on microstructural evolution of ingot during plastic deformation process

Authors： Ma Qingxian1 Liu Jiamian1 Lyu Hongru1 Wang Zhuolin1 Li Haiying2 Yang Wenqing2

Unit： 1.Department of Mechanical Engineering Tsinghua University 2. Inner Mongolia North Heavy Industry Group Corp.Ltd.

KeyWords： 40CrNi4MoV steel holding time microstructure plastic deformation grain refinement

ClassificationCode：TG314.3

year,vol(issue):pagenumber：2025,50(3):14-22

Abstract：

High-strength large-diameter stepped thick-walled pipes are critical components determining the service performance of various important equipment, and clarifying their microstructural characteristics and mechanical property parameters is of great importance. The effects of holding time on grain size evolution and microstructure in 40CrNi4MoV steel of ingot material for stepped thick-walled steel pipes were comparatively analyzed using optical microscopy and electron backscatter diffraction (EBSD) techniques. The results indicate that insufficient holding time at an initial forging temperature of 1200 ℃ tends to induce the internal cracking during the upsetting process. The holding time demonstrates negligible influence on the refinement of grain structure under plastic deformation conditions, while distinct microstructural variations between grains with different grain orientations were observed through EBSD method. High-temperature plastic deformation for grain refinement remains the most effective method, and corresponding adjustments can be implemented during the subsequent production process optimization.

Funds：

国防基础科研计划（JCKY2022208A002）

作者简介：马庆贤（1964-），男，博士，教授 E-mail：maqxdme@mail.tsinghua.edu.cn

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