Mathematical Modelling of Carbonitride Precipitation during Hot Working in Nb Microalloyed Steels  

作　　者：Yunbo XU Yongmei YU Xianghua LIU Guodong WANG 

机构地区：[1]State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China

出　　处：《Journal of Materials Science & Technology》2006年第2期149-152,共4页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.50334010,50504007 and 50474086);the Ph.D.Startup Foundation of liaoning Province(2003hp1009).

摘　　要：Based on thermodynamics and kinetics, precipitation behavior of microalloyed steels was analyzed. Deformation greatly promotes isothermal carbonitride precipitation and makes C-curve shift leftwards. The position and shape of C-curve also depend on the content of Nb and N. C-curve shifts leftwards a little when N content increases and the nose temperature is raised with increasing Nb content. Deformation shortened precipitation start time during continuous cooling, raised precipitation start temperature, accelerated precipitation kinetics of carbonitrides. With decreasing the finishing temperature and coiling temperature, the precipitates volume fraction increases and strength increment is raised during hot rolling. The simulated results are in agreement with experiment results.Based on thermodynamics and kinetics, precipitation behavior of microalloyed steels was analyzed. Deformation greatly promotes isothermal carbonitride precipitation and makes C-curve shift leftwards. The position and shape of C-curve also depend on the content of Nb and N. C-curve shifts leftwards a little when N content increases and the nose temperature is raised with increasing Nb content. Deformation shortened precipitation start time during continuous cooling, raised precipitation start temperature, accelerated precipitation kinetics of carbonitrides. With decreasing the finishing temperature and coiling temperature, the precipitates volume fraction increases and strength increment is raised during hot rolling. The simulated results are in agreement with experiment results.

关 键 词：Nb microalloyed steels Precipitation kinetics Precipitation-temperature-time curve Continuous cooling precipitation Mathematical modeling 

分 类 号：TG142.33[一般工业技术—材料科学与工程]