燕山大学学报2024，Vol.48Issue(4)：322-332,11.DOI:10.3969/j.issn.1007-791X.2024.04.004
退火工艺下轧制差厚板非均匀温度场研究
Study on non-uniform temperature field of tailor rolled blank under annealing process
摘要
Abstract
Under the annealing process,due to the continuous variation of the thickness of the tailor rolled blank,the temperature change paths in different thickness regions are significantly different,which affects the microstructure and mechanical properties of the tailor rolled blank,and more directly affects its subsequent forming and service performance.Therefore,in order to grasp the performance differentiation characteristics and internal causes of the tailor rolled blank under annealing process,it is necessary to systematically study the temperature distribution and law of the tailor rolled blank during heat treatment.The geometric characteristics of the tailor rolled blank are as follows:the longitudinal length of the thin zone,the transition zone and the thick zone is 50 mm;the thickness of the thin zone is 1 mm,the thickness of the thick zone is 1.5 mm,the difference thickness ratio is 1.5,and the thickness of the transition zone changes continuously without mutation.An unsteady theoretical model of temperature field considering the continuous variation characteristics of the thickness of the tailor rolled blank and the comprehensive heat transfer form was established,and the accuracy of the theoretical model was verified by experimental methods.The results show that in the heating process of the preset annealing temperature of 780℃,the time(75 s)when the thin zone reaches the critical temperature is taken as the end point of temperature measurement,and the maximum temperature of each thick zone is 779.3℃.The maximum temperature difference is 135.1℃,showing a trend of increasing first and then decreasing.The maximum heating rate is 21.9℃/s,and then the heating rate of each region gradually decreases and the heating rate of each thick region changes when the heating process reaches 37 s.In order to provide a theoretical basis and effective method for the prediction of performance difference after heat treatment of the tailor rolled blank,the temperature distribution trend and internal law of the tailor rolled blank with time are analyzed.关键词
轧制差厚钢板/非均匀温度场/厚度连续变化特性/温度分布差异Key words
tailor rolled blank/non-uniform temperature field/continuous thickness change characteristics/temperature distribution difference分类
矿业与冶金引用本文复制引用
卢日环,宋行之,王小巩,刘自权,贾方振,张思佳,胡贤磊..退火工艺下轧制差厚板非均匀温度场研究[J].燕山大学学报,2024,48(4):322-332,11.基金项目
国家自然科学基金资助项目(52005432) （52005432）
河北省自然科学基金资助项目(E2021203179,E2021209041) （E2021203179,E2021209041）
中国博士后科学基金资助项目(2020M680904) （2020M680904）
河北省人社厅博士后科研资助项目(B2020003011) （B2020003011）
