Characterization and numerical simulation of nucleation-growth-coarsening kinetics of precipitates in G115 martensitic heat resistance steel during long-term aging  

作　　者：Yun-he Yu Zheng-dong Liu Zhen Liu Zheng-zong Chen Han-sheng Bao Chi Zhang Zhi-gang Yang 

机构地区：[1]Shagang School of Iron and Steel,Soochow University,Suzhou 215137,Jiangsu,China [2]Key Laboratory for Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]Research Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Iron and Steel Research International》2023年第6期1279-1290,共12页

基　　金：financially supported by the National Key Research and Development Program of China(Grant Nos.2020YFB0311000 and 2017YFB0305201);the Fund of Key Laboratory of Advanced Materials of Ministry of Education(ADV22-12);the Jiangsu Funding Program for Excellent Postdoctoral Talent.

摘　　要：The service performance of heat resistance steels is largely determined by the precipitation kinetics.The nucleation-growth-coarsening behaviors of precipitates in G115 martensitic heat resistance steel during long-term aging at 650℃ have been systemically investigated.The microstructural characteristics,precipitate morphology and alloying element distribution were studied by scanning electron microscopy,transmission electron microscopy and scanning transmission electron microscopy.The lognormal distribution fitting combined with the multiple regression analysis was adopted to evaluate the precipitate size distributions.Laves phase has longer incubation time,and its coarsening rate is almost one order of magnitude higher in comparison with that of M_(23)C_(6) carbide.Furthermore,the nucleation rate,number density,average radius,and volume fraction of two precipitates are simulated based on the classical nucleation theory and the modified Langer-Schwartz model.The precipitation behavior of Laves phase can be well explained with the Fe-W system as the interfacial energy takes 0.10 J/m^(2).In contrast,the simulation results of M_(23)C_(6) carbide in the Fe-Cr-C system are significantly overestimated,which results from the inhibitory effect of boron on coarsening.

关 键 词：NUCLEATION Growth COARSENING Precipitation kinetics G115 heat resistance steel Long-term aging 

分 类 号：TG142[一般工业技术—材料科学与工程]