Transactions of Materials and Heat Treatment

Title：Influence of forging and heat treatment process on control interface of mixed crystal defect for large shaft parts

Authors： Xu Yue Liu Shuaiqi Liu Jiansheng

Unit： Taiyuan University of Science and Technology

KeyWords： ultra-supercritical medium-pressure rotor post-forging heat treatment forging mixed crystel

ClassificationCode：TG316

year,vol(issue):pagenumber：2024,49(3):8-17

Abstract：

By drawing and isothermal heat treatment experiments, the process tolerance of post-forging heat treatment process for ultra-supercritical medium-pressure rotor on the control of mixed crystal after final forging was explored, and it was found that the process tolerance between forging process and post-forging heat treatment process was 5-grade mixed crystal degree in eliminating mixed crystal defect. Then, combined with the finite element simulation and physical simulation experiments, for the purpose that the degree of grain size refinement and homogenization of medium-pressure rotor after final forging could meet the process tolerance requirements of post-forging heat treatment process on the premise that the medium-pressure rotor didnot produce cracks after final forging, the optimal forging process window for the final forging of 12%Cr rotor steel was obtained, that is, when the strain rate was 0.1 s-1, the initial forging temperature was controlled at 1140-1275 ℃ and the forging ratio was controlled at 1.157-1.582. Based on the forging process window, the forging sequence and the forging ratio of each stepped shaft during the final forging of ultra-supercritical medium-pressure rotor were deduced. The results show that the degree of grain structure refinement and homogenization for each stepped shaft of medium-pressure rotor can meet the requirements of actual forging process.

Funds：

国家自然科学基金资助项目（51775361）；山西省基础研究计划项目（202303021212230）；太原科技大学博士启动金（20222055）

作者简介：徐月（1993-），女，博士，讲师,E-mail：xuyue322520@163.com

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