18CrNiMo7-6齿轮钢动态再结晶模型和数值模拟  

Dynamic recrystallization model and numerical simulation of 18CrNiMo7-6 gear steel

作　　者：谢一夔 王忠英 付建勋 刘辉 Xie Yikui;Wang Zhongying;Fu Jianxun;Liu Hui(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;East China Branch of CISRI,Huai'an 223007,China;School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[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

出　　处：《锻压技术》2024年第9期195-201,229,共8页Forging & Stamping Technology

基　　金：国家重点研发计划(2020YFB2008104)。

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.

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[一般工业技术—材料科学与工程]