In-situ tensile fracture mechanism of new type austenitic heat-resistant steel C-HRA-5
DU Hua-yun1,2, DAI Xin-yu1, WEI Ying-hui1,2,3, HOU Li-feng1,2, FANG Xu-dong4,5, XU Fang-hong4,5
1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China; 2. Shanxi Metal Materials Corrosion and Protection Engineering Technology Research Center, Taiyuan 030024, Shanxi, China; 3. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China; 4. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and SteelGroup Co., Ltd., Taiyuan 030003, Shanxi, China; 5. Technology Center, Shanxi Taiyuan Stainless Steel Co., Ltd., Taiyuan 030003, Shanxi, China
Abstract：Fracture mechanism is one of the main research directions of mechanical properties of materials. In order to clarify the uniaxial tensile fracture mechanism of C-HRA-5 steel,the entire tensile process was observed by in-situ SEM,and the initiation-propagation-fracture of microcracks in this heat-resistant steel was analyzed deeply.The results show that C-HRA-5 steel exhibits typical ductile fracture characteristics at room temperature and 700 ℃.The fracture of the material is mainly affected by the M23C6 phase and the MX phase,and microcracks originate from the trigeminal grain boundaries where the M23C6 phase aggregates. At room temperature,microcracks are connected to the cracks in the MX phase of the crystal,forming transgranular cracks. At high temperatures,micro-cracks form local transgranular cracks under the action of shear stress,resulting in the ultimate failure of the material.
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2020, Vol. 55 
