Transactions of Materials and Heat Treatment

Title：Influence of solution treatment on grain growth and hardness for 316 stainless steel

Authors： Zhao Ming1 Chang Yuan2 Song Yaohui1 Li Huaying1 Zhang Mingxin3

Unit： 1. Taiyuan University of Science and Technology 2. Taiyuan Heavy Industry Co. Ltd. 3.Shanxi Aerospace Tsinghua Equipment Co. Ltd.

KeyWords： solution treatment solution temperature holding time grain size grain growth model hardness

ClassificationCode：TG113

year,vol(issue):pagenumber：2024,49(3):194-201

Abstract：

The influences of solution treatment at 1100-1175 ℃ on the microstructure, grain boundary distribution characteristics and alloy hardness of 316 stainless steel were studied by means of metallographic microscopy, EBSD and microhardness tester. At the same time, the Anelli grain growth model was established. The results show that the grain size of stainless steel gradually grows with the increasing of solution temperature and the extension of holding time, when the solution temperature exceeds 1150 ℃ and the holding time exceeds 60 min, the grain size increases rapidly. Based on the concidence site lattice theory of grain boundaries, the distribution characteristics of grain boundaries were analyzed and found. With the increasing of solution temperature and the extension of holding time, the contents of ∑3, ∑9, and ∑27 grain boundaries all decrease, especially the grain boundary content of ∑3 decreases obviously, and the hardness of sample also decreases. The effect of solution temperature on the grain size and hardness is significantly greater than that of holding time.

Funds：

山西省高等学校科技创新项目(2020L0333)；山西省科技成果引导专项项目（202204021301057）

作者简介：赵明（1997-），男，硕士研究生，E-mail：251291106@qq.com；通信作者：李华英（1981-），男，博士，硕士生导师，副教授，E-mail：2014246@tyust.edu.cn

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