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Acta Metall Sin  1985, Vol. 21 Issue (3): 54-152    DOI:
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THE SEM IN SITU OBSERVATION OF TENSILE FRACTURE PROCESSES IN PLAIN CARBON DUAL-PHASE STEELS
SHEN Xianpu;LEI Tingquan;LIU Jianzhuang Harbin Institute of Technology
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SHEN Xianpu;LEI Tingquan;LIU Jianzhuang Harbin Institute of Technology. THE SEM IN SITU OBSERVATION OF TENSILE FRACTURE PROCESSES IN PLAIN CARBON DUAL-PHASE STEELS. Acta Metall Sin, 1985, 21(3): 54-152.

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Abstract  The dynamic microprocesses of fracture in martensite-ferrite dual-phase steelswere observed by the in situ technique in SEM equipped with tensile platform.The mechanism of crack nucleation has been clarified.The conditions of crack prop-agation and affecting factors have been discussed.It is believed that the propaga-tion of the microcracks depends on the combined effect of both tensile stress andplastic shear strain.The dislocation pile-up model can be successfully used for ex-plaining the effect of the volume fraction of martensite,the carbon content in itand the low temperature tempering on crack nucleation.Furthmore,the factorsaffecting the ductility of dual-phase steels were analyzed according to the specificfeatures of fracture processes.
Received:  18 March 1985     
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