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CRITICAL VOID-GROWTH STATE AND RELATED FRACTURE TOUGHNESS IN BHW60 STEEL |
ZHOU Li;ZHENG Changqing;LU Zhixian;DING Fulian Northwestern Polyechnical University; Xi'an Iron and Steel Research Institute; Shanghai Baoshan Steel WorksDepartment of Engineering Mechanics;Northwestern Poly technical Uni versity; Xi'an 710072. |
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Cite this article:
ZHOU Li;ZHENG Changqing;LU Zhixian;DING Fulian Northwestern Polyechnical University; Xi'an Iron and Steel Research Institute; Shanghai Baoshan Steel WorksDepartment of Engineering Mechanics;Northwestern Poly technical Uni versity; Xi'an 710072.. CRITICAL VOID-GROWTH STATE AND RELATED FRACTURE TOUGHNESS IN BHW60 STEEL. Acta Metall Sin, 1993, 29(8): 44-48.
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Abstract The critical void-grwoth ratio, R_c/ R_o, was measured quantitatively underSEM to the core of fracture surface of smooth and notched tensile specimens for BHW60steel at 20, -60, -100 and -140℃. Correlation between R_c/ R_0 and macroscopic fracturetoughness, V_(GC), as well as the effect of heat treated condition upon them were investigated.Results show that the R_c/ R_0 values are approximately obedient to normal probability dis-tribution at the same temperature, decrease linearly with the decrease of temperature and arerelated to V_(GC) as: V(GC)= Cln(R_c/ R_0), where C=3.5. This expression seems to be in goodagreement with the R-T model of void-grwoth and the coefficient C is insensitive to temper-ature and heat treated condition.
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Received: 18 August 1993
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