Effect of intra-crystalline micropores on FeO rupture in FeO/Fe based on MD
FAN Ming-yang1, ZHOU Cun-long1,2, DUAN Jing-jing1, GONG Jian-xiong1, MA Guo-cai3
1. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China; 2. Shanxi Key Laboratory of Metallurgical Equipment Design Theory and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China; 3. ESP Production Department, Rizhao Steel Holding Group Co., Ltd., Rizhao 276806, Shandong, China
Abstract：The micropores in oxide skin directly affects the cracking performance of oxide skin. Molecular dynamics simulation software Lammps was used to simulate the tensile fracture of FeO/Fe polycrystalline model with micropores. The effect of micropore size on tensile fracture of FeO/Fe polycrystalline model with different numbers of micropore was studied. The results show that the tensile strength of FeO model presents a trend of decreasing→increasing→decreasing with the increase of micropore size at the same number of micropores, indicating that micro-pore size in a certain range can improve the tensile strength of material, but the it can reduce the fracture toughness of material at the same time. CSP values show that the regions of atomic disorder degree from high to low are as follows of micropore, grain boundary, FeO/Fe interface and inside the FeO polycrystal. The results provide a new idea for the study of fracture mechanism for oxide skin.
樊铭洋, 周存龙, 段晶晶, 龚建雄, 马国财. 基于MD探究FeO/Fe中晶内微孔洞对FeO破裂的影响[J]. 中国冶金, 2022, 32(7): 67-73.
FAN Ming-yang, ZHOU Cun-long, DUAN Jing-jing, GONG Jian-xiong, MA Guo-cai. Effect of intra-crystalline micropores on FeO rupture in FeO/Fe based on MD[J]. China Metallurgy, 2022, 32(7): 67-73.
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2022, Vol. 32 
