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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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Cite this article:
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.
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Received: 18 March 1981
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[4] 钢铁研究院断裂韧性研究组,金属学报,13(1978) ,214．
[5] 小坂田宏造,塑性加工,9(1978) ,665．
[6] Elber, W., Fracture Toughness and Slow-Stable Cracking, Proc. 1973 National Symp. Fract. Mech., Part 1, ed. by P. C. Paris, (ASTM STP 559) , ASTM, 1974, p. 45．
[7] Sin, G. C., Handbook of Stress-Intensity Factors, Inst. of Fracture and Solid Mech., Bethlehem, Pennsylvania, 1973, p. 1． 3． 1-1;
[8] Rooke, D. P. and Cartwight, D. J., Compendium of Stress Intensity Factors, HMSO, London, 1976, p. 233．
[9] 未发表工作. |
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