摘要
结合JmatPro热力学软件对Nb-Ti-V-Mo微合金化E460海工钢中多元复合析出相的固溶热力学计算和经典形核长大动力学理论,研究了(Nb,Ti,Mo,V)C在奥氏体和铁素体中沉淀析出规律,探讨了奥氏体形变储能和形变诱导析出量对(Nb,Ti,Mo,V)C沉淀析出动力学的影响。研究表明,(Nb,Ti,Mo,V)C在1448.6 K时开始析出。在奥氏体相区,随着温度的降低,临界形核功逐渐降低,NrT曲线和PTT曲线呈单调变化趋势。在奥氏体和铁素体两相区,(Nb,Ti,Mo,V)C的最快沉淀析出温度为1062.6 K。随着形变储能的增加,相对形核率呈增加趋势,析出孕育期缩短。随形变诱导析出量增加,PTT曲线向左移动,最大形核率温度和最快析出温度为1058.3~1063.8 K。
The precipitation thermodynamics of the multi-element composite precipitates in the Nb-Ti-V-Mo microalloy E460 off shore steel was calculated by JmatPro thermodynamics software,in combination with the classical nucleation and growth kinetic theory,were used to study precipitation law of(Nb,Ti,Mo,V)C in austenite and ferrite.The influence of austenite deformation storage and deformation-induced precipitation on(Nb,Ti,Mo,V)C precipitation and precipitation kinetics were also discussed.The results indicate that(Nb,Ti,Mo,V)C begins to precipitate at 1448.6 K.In austenite region,as the temperature decreases the critical nucleation energy gradually decreases,and the NrT curve and the PTT curve show a monotonous trend.In the two-phase region of austenite and ferrite,the fastest precipitation temperature of(Nb,Ti,Mo,V)C is 1062.6 K.Relative nucleation rate increases,and both precipitation and incubation period shorten with the increase of deformation energy storage.As the amount of precipitation induced by deformation increases,the PTT curve shifts to the left,and the maximum nucleation rate temperature and the fastest precipitation temperature are between 1058.3 K and 1063.8 K.
作者
姚娜
兴超
Yao Na;Xing Chao(Department of Metallurgy and Chemical Engineering,Jiyuan Vocational and Technical College,Jiyuan 459000,Henan,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第4期142-149,共8页
Iron Steel Vanadium Titanium
基金
河南省高等学校重点科研项目计划(19B450003)。
