Multi-phase field simulation of multi-grain peritectic transition in multiple phase transformation  

作　　者：Li Feng Jun-he Zhong Chang-sheng Zhu Jun Wang Guo-sheng An Rong-zhen Xiao 

机构地区：[1]College of Materials and Engineering,Lanzhou University of Technology,Lanzhou 730050,China [2]State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China

出　　处：《China Foundry》2020年第5期357-363,共7页中国铸造（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.:11504149,51661020);Natural Science Foundation of Gansu Province of China(Grant No.:18JR3RA147).

摘　　要：Taking Fe-C binary alloy as an example,based on the multi-phase field model,the nucleation and growth ofδphase,peritectic reaction,peritectic transformation,and the growth of subsequent austenite are simulated.Effects of the nucleation site of austenite on the peritectic reaction rate and the starting time of the peritectic transformation were studied.The simulation results show that theγphase,as a shell,surrounds theδphase and grows rapidly when the peritectic reaction occurs between the dendriticδgrains,and a layer ofγphase shell is formed aroundδphase after the peritectic reaction.After theδphase is surrounded byγphase completely,the membrane shell separates the L phase from theδphase,so that the phase transfers from peritectic reaction to peritectic transformation.During the peritectic transformation,since the solute diffusion coefficient of the liquid phase is much greater than that of the solid phase,the average growth rate of austenite in the liquid phase is visibly higher than that of theδphase.The peritectic reaction rate is related to the curvature of the nucleation site of theγphase on theδphase grains.The peritectic reaction rate at the large curvatures is faster than that at small curvatures.

关 键 词：phase field Fe-C binary alloy peritectic transformation microstructure numerical simulation 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]