In-situ tensile fracture mechanism of new type austenitic heat-resistant steel C-HRA-5

DU Hua-yun; DAI Xin-yu; WEI Ying-hui; HOU Li-feng; FANG Xu-dong; XU Fang-hong

doi:10.13228/j.boyuan.issn0449-749x.20200096

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Iron and Steel ›› 2020, Vol. 55 ›› Issue (11) : 118-125. DOI: 10.13228/j.boyuan.issn0449-749x.20200096

Materials

In-situ tensile fracture mechanism of new type austenitic heat-resistant steel C-HRA-5

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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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C-HRA-5 steel / in-situ tensile / fracture mechanism / M₂₃C₆phase / MX phase

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DU Hua-yun, DAI Xin-yu, WEI Ying-hui, et al. In-situ tensile fracture mechanism of new type austenitic heat-resistant steel C-HRA-5[J]. Iron and Steel, 2020, 55(11): 118-125 https://doi.org/10.13228/j.boyuan.issn0449-749x.20200096

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