锻压技术

18CrNiMo7-6齿轮钢动态再结晶模型和数值模拟

英文标题：Dynamic recrystallization model and numerical simulation of 18CrNiMo7-6 gear steel

作者：谢一夔1 2 王忠英1 2 付建勋1 刘辉3

单位：（1. 上海大学材料科学与工程学院上海 200444 2.钢铁研究总院华东分院江苏淮安 223007 3.安徽建筑大学材料与化学工程学院安徽合肥 230601）

关键词：18CrNiMo7-6钢动态再结晶晶粒尺寸演变单道次压缩试验 Deform-3D

分类号：TG142.1

出版年,卷(期):页码：2024,49(9):195-201

摘要：

利用Gleeble-3500热模拟机对18CrNiMo7-6齿轮钢进行单道次压缩试验，旨在探索钢材在不同变形温度和应变速率下的动态再结晶行为及晶粒尺寸演变规律。通过建立动态再结晶模型和晶粒尺寸模型，并利用Deform-3D有限元仿真软件进行模拟，揭示了试样中心区域的完全再结晶特征及其随温度变化的扩展趋势。模拟结果表明：试样中心区域完全再结晶，并随着变形温度的增大而扩大。低应变速率条件下，由于畸变能和位错积累的不足，使得不完全再结晶区域增加。晶粒尺寸随变形温度的降低而减小，但可能导致混晶。同时，低应变速率时中心和膨胀区的晶粒尺寸普遍较大，而随着变形的增加，晶粒尺寸在两端呈现出相反的变化趋势，这种混晶现象尤为显著。

The single-pass compression tests on 18CrNiMo7-6 gear steel were conducted by Gleeble-3500 thermal simulation machine to explore the dynamic recrystallization behavior and the evolution law of grain size of steel under different deformation temperatures and strain rates. Then, the dynamic recrystallization and grain size models were established and simulated by finite element software Deform-3D, and the complete recrystallization characteristics in the central region of the sample and its changing expansion trend with the temperature were revealed. The simulation results show that the central region of the specimen undergoes complete recrystallization and expands with the increasing of deformation temperature. Under low strain rate condition, the incomplete recrystallization area increases due to the lack of distortion energy and dislocation accumulation. The grain size decreases with the decreasing of deformation temperature, but it may lead to mixed crystal. At the same time, the grain sizes in the center and expansion regions are generally larger under low strain rate condition. With the increasing of deformation, the grain size shows opposite changing trends at both ends, and this mixed crystal phenomenon is particularly significant.

基金项目：

基金项目:国家重点研发计划（2020YFB2008104）

作者简介：谢一夔(1992-)，男，博士研究生 E-mail：Asher_xykch@163.com 通信作者：王忠英(1967-)，男，博士，教授级高工 E-mail：13357968558@163.com

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