TEM Study of Microcrack Nucleation and Propagation for 310 Stainless Steel

Hongqi Li, Qizhi Chen, Yizhong Huang, Yanbin Wang, Wuyang Chu

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    Cite this article as:

    Hongqi Li, Qizhi Chen, Yizhong Huang, Yanbin Wang, and Wuyang Chu, TEM Study of Microcrack Nucleation and Propagation for 310 Stainless Steel, J. Univ. Sci. Technol. Beijing , 5(1998), No. 2, pp.100-103.
    Hongqi Li, Qizhi Chen, Yizhong Huang, Yanbin Wang, and Wuyang Chu, TEM Study of Microcrack Nucleation and Propagation for 310 Stainless Steel, J. Univ. Sci. Technol. Beijing , 5(1998), No. 2, pp.100-103.
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    TEM Study of Microcrack Nucleation and Propagation for 310 Stainless Steel

    基金项目: 

    Project supported by the National Foundation of Nature Science of China

      通信作者:
    TEM in situ tensile tests of 310 stainless steel show that a dislocation free zone (DFZ) forms if the displacement keeps constant after dislocations are emitted from a crack tip. The elastic DFZ is gradually thinned and the stress in the DFZ will reach the cohesive strength, resulting in nucleation of nanocracks in it and their bluntness into voids. If continuously tensioning, the inhomogeneously thinning ahead of the crack tip, initiating and connecting of microcracks or microvoids will be observed rather than a DFZ, nanocracks' initiation and bluntness into voids. The inverse pile-up ahead of a loaded crack tip can move back to the crack tip when unloading.

     

    Materials

    TEM Study of Microcrack Nucleation and Propagation for 310 Stainless Steel

    Author Affilications
    • Funds: 

      Project supported by the National Foundation of Nature Science of China

    • Received: 09 September 1997;
    TEM in situ tensile tests of 310 stainless steel show that a dislocation free zone (DFZ) forms if the displacement keeps constant after dislocations are emitted from a crack tip. The elastic DFZ is gradually thinned and the stress in the DFZ will reach the cohesive strength, resulting in nucleation of nanocracks in it and their bluntness into voids. If continuously tensioning, the inhomogeneously thinning ahead of the crack tip, initiating and connecting of microcracks or microvoids will be observed rather than a DFZ, nanocracks' initiation and bluntness into voids. The inverse pile-up ahead of a loaded crack tip can move back to the crack tip when unloading.

     

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