Transactions of Materials and Heat Treatment

Title：Static recrystallization behavior on thermal deformation austenite for C250 steel

Authors： Dai Yanzhang Han Shun Li Yong Wang Chunxu Shang Limei Yang Chao

Unit： Institute of Special Steels Central Iron and Steel Research Institute Co. Ltd. Department of Material Technology AECC Commercial Aircraft Engine Co. Ltd.

KeyWords： C250 steel austenite static recrystallization grain size kinetic model

ClassificationCode：TG142.2

year,vol(issue):pagenumber：2022,47(11):231-238

Abstract：

The static recrystallization softening behavior of C250 maraging steel in thermalforming was studied by a two-pass thermal compression test method on thermo-simulation machine Gleeble 1500. Then, the influences of different process parameters, such as deformation temperature, strain rate, deformation amount and inital austenite grain size, on the static recrystallization behavior were analyzed, and the size changes of static recrystallization grains under different deformation conditions were observed. Based on the test data, the kinetic model of static recrystallization for C250 steel was constructed, and the activation energy of static recrystallization for C250 steel was obtained as 146900.1 J·mol-1. The test results show that the volume fraction of static recrystallization for C250 steel can be improved with the increasing of deformation temperature, strain rate, deformation amount and interval time between passes. Among them, the deformation amount has the greatest influence on the volume fraction of static recrystallization, while the grain size of inital austenite has little effect on it. The significant static recrystallization phenomenon in the metallographic structure of specimen in different deformation conditions is observed, and the influence trend is the same as that obtained by calculation. Based on two-pass thermal compression test data, the predicted results of the static recrystallization kinetic model are compared with the test results, and the two are in good agreement.

Funds：

作者简介：戴彦璋（1998-），男，硕士研究生，E-mail：798273335@qq.com；通信作者：韩顺（1987-），男，博士，高级工程师，E-mail：hanshunfa@126.com

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