BHW60钢的临界空穴扩张状态与相关的断裂韧性

金属学报

1993, Vol. 29

Issue (8): 44-48

论文

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BHW60钢的临界空穴扩张状态与相关的断裂韧性

周利;郑长卿;卢智先;丁富连

讲师;西安(710072);西北工业大学工程力学系;西北工业大学;西北工业大学;上海宝山钢铁公司研究所

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.

引用本文:

周利;郑长卿;卢智先;丁富连. BHW60钢的临界空穴扩张状态与相关的断裂韧性[J]. 金属学报, 1993, 29(8): 44-48.
, , , . CRITICAL VOID-GROWTH STATE AND RELATED FRACTURE TOUGHNESS IN BHW60 STEEL[J]. Acta Metall Sin, 1993, 29(8): 44-48.

全文: PDF(348 KB)

摘要: 用扫瞄电镜在拉伸试样断口心部,测量了BHW60钢在20,-60,-100和-140℃下的临界空穴扩张比R_e/R_o,研究了它与宏观断裂韧性V_GC的关系以及热处理状态的影响结果表明:(1)同一温度下R_e/R_o的测量值大致遵循正态概率分布;(2)R_e/R_o随着温度降低直线减小; (3)R_e/R_o与V_GC的关系为V_GC=Cln(R_e/R_o),其中C≈3.5,与R—T空穴扩张模型符合得较好,H与温度和热处理状态无关

关键词 ： BHW60钢, 临界空穴状态, 断裂韧性, 判据

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.

Key words： BHW60 steel critical void state fracture toughness failure criterion

收稿日期: 1993-08-18

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