Transactions of Materials and Heat Treatment

Title：Grain size control for large austenitic stainless steel forgings

Authors： Li Changyi Wang Hang Wang Aiqin Xie Jingpei Yu Xingsheng Shi Ruxing Wang Wenyan

Unit： Luoyang CITIC HIC Casting ＆ Forging Co. Ltd. CITIC Heavy Industries Co. Ltd. Henan University of Science and Technology

KeyWords： F316H austenitic stainless steel grain size dynamic recrystallization tube sheet microstructure evaluation

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(8):22-28

Abstract：

For the problems of large plastic deformation resistance and cracking, coarse grains and mixed grains easily caused by improper forging process for large forgings of F316H austenitic stainless steel, the grain coarsening test, high temperature tensile and high temperature compression tests were carried out, and the influences of material grain growth law, thermoplasticity and critical deformation amount on the dynamic recrystallization were studied. The test results show that when the deformation temperature is higher than 1050 ℃, the grain size increases with the extending of holding time, and the higher the deformation temperature is, the more obvious the trend of grain size growth is. With the increasing of deformation temperature, the tensile strength of material gradually decreases, and the plastic resistance gradually decreases. At the same deformation temperature, the degree of dynamic recrystallization increases with the increasing of deformation degree. Under the same deformation amount, with the increasing of deformation temperature, the dynamic recrystallization is more sufficient, the grain size is smaller, and the number of grains increases significantly. According to the test results, the forging process of tube sheet forgings with a diameter of Φ5800 mm was formulated, and a good effect was obtained by practical production verification.

Funds：

洛阳市重大科技专项（2101005A）

作者简介：李昌义（1981-），男，博士，正高级工程师，E-mail：18638369057@163.com；通信作者：王行（1989-），男，博士研究生，E-mail：wanghangred@163.com

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