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Acta Metall Sin  1981, Vol. 17 Issue (3): 259-365    DOI:
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FRACTURE-MECHANICS ANALYSIS OF COLD-DRAWN Si-Cr VALVE STEEL
by Yin Jiang and Xu Jingfeng (Shanghai No. 5 Steel Works)
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by Yin Jiang and Xu Jingfeng (Shanghai No. 5 Steel Works). FRACTURE-MECHANICS ANALYSIS OF COLD-DRAWN Si-Cr VALVE STEEL. Acta Metall Sin, 1981, 17(3): 259-365.

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Abstract  A fracture-mechanics approach was used in studying the cold-drawn splitting in Si-Cr valve steel. It seems that the cold deformation fracture toughness, K_(Ic),the peak value of cold-drawn tangential residual tensile stress, σ_(tm), and the depth of surface blemish, α, are the three main factors affected the splitting. An expression to determine the growth of split in cold-drawn rod may be as follows:K_(Ic)=σ_(tm)(πα)~(1/2)(K_I/K_0)The exact value of K_(Ic) is easily given by cold-heading specimen after cold deformation. Thus, the cold-drawing process makes possible to control the blemish depth. This process allows the steel to withstand a single cold drawing reduction of 20—30% or more at room temperature without splitting or recrystallized granular fracture and to give superior performance that can ever be obtained previously by hot drawing.
Received:  18 March 1981     
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[1] #12
[2] #12
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[9] 未发表工作.
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