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| AN IN-SITU OBSERVATION OF THE MICROPROCESS OF FAILURE BY DUCTILE FRACTURE IN STEEL |
| Xu Yongbo;Liu Minzhi;Li Hengwu;Su Huihe;Zhu Guiqiu |
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Cite this article:
Xu Yongbo;Liu Minzhi;Li Hengwu;Su Huihe;Zhu Guiqiu. AN IN-SITU OBSERVATION OF THE MICROPROCESS OF FAILURE BY DUCTILE FRACTURE IN STEEL. Acta Metall Sin, 1979, 15(3): 367-452.
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Abstract The microprocess of failure by ductile fracture under tensile stress in speci-mens of two carbon steels containing 0.15% and 0.45% C respectively and of a25Cr20Ni type stainless-steel has been examined in-situ in SEM. Cracking wasnucleated preferentially in three different ways, e.g., at the inclusion/matrix, atthe twin/matrix boundary and at the σ-phase/matrix interface. In both the firstand second cases, the cracks were formed at the inter-faces and widened in thesteel matrix along the direction of applied stress. In the third case the crackswere nucleated at the σ-phase/matrix interface and grown into σ-phase particle.As the applied stress became greater and greater, other oracks nearby appear tocoalescence along the shear direction of the steel with the result of total failure.
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Received: 18 March 1979
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