Transactions of Materials and Heat Treatment

Title：Influence of hot deformation on crystallographic characteristics of quenched martensite for 35CrMo steel

Authors： Wei Minggang Gong Bin Min Wu Li Wenqiang Mo Anjun Yuan Wuhua

Unit： China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd. Hunan University

KeyWords： 35CrMo steel dynamic recrystallization martensite crystallography austenite

ClassificationCode：TG113

year,vol(issue):pagenumber：2022,47(8):249-254

Abstract：

The quenched martensite structure of 35CrMo steel under different strains was obtained by hot compression test. Then, the influences of hot deformation on the crystallographic characteristics of quenched martensite for 35CrMo steel were investigated based on electron backscatter diffraction(EBSD)test technique, and the changes of austenite grain size and combination characteristics of martensitic variants under different deformation amounts were analyzed. The research results show that the occurrence of dynamic crystallization with multiple rounds results in multimodal changes of the true stress-true strain curve at high temperature, and the first round of dynamic crystallization significantly refines the austenite grains. The grain orientation of original austenite determines the type of martensitic variants after quenching, and the combination pattern of quenched martensitic variants is close-packed plane combination. In addition, the orientation difference between the quenched martensite variants under different deformation amounts is concentrated in the range of 50°-60°, and the grains can be refined by introducing large-angle grain boundaries.

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作者简介：魏明刚（1978-），男，学士，工程师，E-mail：wmg213@163.com

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