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Study on 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 in depth. The results show that C-HRA-5 steel exhibits typical ductile fracture characteristics at room temperature and 700 °C. 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 τ, resulting in the ultimate failure of the material.
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Received: 10 March 2020
Published: 16 October 2020
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