Fracture mechanism of inclusions in thick plate center under tensile loading
作者机构：Collaborative Innovation Center for Advanced SteelsWuhan University of Science and TechnologyWuhan430081HubeiChina Department of Applied PhysicsWuhan University of Science and TechnologyWuhan430081HubeiChina Analysis and Testing CenterWuhan University of Science and TechnologyWuhan430081HubeiChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2024年第31卷第5期
页 面：1196-1209页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：the financial support to the National Natural Science Foundation of China(U20A20279) the technical support provided by Analysis and Test Center of Wuhan University of Science and Technology,China
主 题：Thick plate Inclusion Finite element simulation Critical fracture stress Fracture mechanism
摘 要：Segregation of solute atoms in the center of thick plates of the tempered steel can cause an inhomogeneous structural transformation and generate micron-sized inclusions,which leads to lamellar tearing of thick plate and decreases the plasticity and *** formation and fragmentation mechanisms of micron-sized inclusions,like MnS and(Nb,Ti)C,in the center of thick plates were investigated by using thermodynamic calculations,finite element simulations,and electron backscatter diffraction characterization *** results show that micron-sized inclusions nucleate and grow in the liquid phase,and under tensile loading,they exhibit three fragmentation *** local stress during the fragmentation of inclusions is lower than the critical fracture stress of adjacent grains,and phase boundaries can effectively impede crack propagation into the *** existence of a low proportion of high-angle grain boundaries(58.1%)and high Kernel average misorientation value(0.534°)in the segregation band promotes inclusions fragmentation and crack *** difference in crack initiation and propagation direction caused by the morphology of inclusions and physical properties,as well as different matrix arrest abilities,is the main reasons for the diversity of inclusion fragmentation.
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