Nb-Ti微合金钢奥氏体晶粒尺寸及分布模型  

Austenite grain size and distribution models of Nb-Ti microalloyed steel

作　　者：李明杰 张欣悦 王斯乔 张欣瑶 周晓光[1] 刘振宇[1] LI Mingjie;ZHANG Xinyue;WANG Siqiao;ZHANG Xinyao;ZHOU Xiaoguang;LIU Zhenyu(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《钢铁研究学报》2025年第3期367-374,共8页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2022YFB3304800);兴辽英才计划资助项目(XLYC2203186);辽宁省科技专项资助项目(2022JH_(2)5/10200001)。

摘　　要：为了探究奥氏体化工艺对Nb-Ti微合金钢奥氏体晶粒长大行为的影响,通过热模拟实验研究了实验钢在奥氏体化温度(1140~1220℃)和保温时间(180~540s)范围内奥氏体晶粒长大行为,并建立了奥氏体晶粒长大及分布的数学模型。结果表明,当保温时间一定时,随着奥氏体化温度的升高,奥氏体晶粒尺寸逐渐增大其分布趋近于均匀化;当奥氏体化温度一定时,随着保温时间的延长,奥氏体晶粒增长速率减慢,晶粒尺寸分布同样趋于均匀化;建立的奥氏体平均晶粒尺寸及其分布的数学模型均与实测值拟合良好;耦合出不同奥氏体化工艺条件下实验钢的奥氏体平均晶粒尺寸和晶粒尺寸分布参数的等高线图,为确定合理的实验钢奥氏体化工艺奠定了理论基础。In order to investigate the effect of austenitizing process on the grain growth behaviors of Nb-Ti microalloyed steel,thermal simulation experiments were conducted to study the austenite grain growth behavior of the experimental steel within the range of austenitizing temperature(1140-1220℃)and holding time(180-540s).The mathematical models for austenite grain growth and its distribution were established.The results indicate that when the holding time is kept constant,the austenite grains tend to grow larger and become more uniformly distributed.When the austenitizing temperature is held constant,prolonging the holding time slows down the growth rate of austenite grains,and the size distribution of the austenite grains will also tend to become more uniform.The mathematical models for the average austenite grain size and its distribution closely match the measured values.Contour plots are generated for the average austenite grain size and grain size distribution parameter under different austenitizing process conditions,which provide a theoretical foundation for determining reasonable austenitizing processes for experimental steels.

关 键 词：NB-TI微合金钢 奥氏体化 晶粒长大 晶粒尺寸分布 数学模型 

分 类 号：TG156.1[金属学及工艺—热处理]