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| A STUDY OF FRACTURE CHARACTERISTICS OF DUAL PHASE STEEL |
| by MA Mingtu; WANG Degen; WU Baorong (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 17 March; 1982) |
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Cite this article:
by MA Mingtu; WANG Degen; WU Baorong (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 17 March; 1982). A STUDY OF FRACTURE CHARACTERISTICS OF DUAL PHASE STEEL. Acta Metall Sin, 1983, 19(4): 80-150.
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Abstract The cleavage fracture stress of the dual phase steels has been evaluated with slow-bend test of blunt V-notched specimens. Their crack propagation path and fracture mode were indicated by the observations of the fracture morphology, the mieroeraek initiation and propagation of fracture surfaces under the cleavage temperature and the mierostrueture. According to the measurements of the cleavage fracture stress and the crack unit, the effective surface energy of the dual phase steels was also calculated by Griffith's equation. It was proposed that the cleavage fracture of the dual phase steels seems to be controlled by stress propagation and its regressive equation may be σ_f =0.33+19.33c~(-1/2) kgf/mm~2. Thus, the cleavage fracture stress may be increased by reducing the grain size of ferrite and martensite islands and by increasing the amount of evenly distributed lath martensite in the islands.
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Received: 18 April 1983
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