金属学报  1986, Vol. 22 Issue (5): 53-150

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晶粒尺寸对奥氏体不锈钢疲劳裂纹低速扩展及其顶端塑性变形的影响

邓蓉英;于桂清;李禾

中国科学院力学研究所;中国科学院力学研究所;中国科学院力学研究所

EFFECT OF GRAIN SIZE ON SLOW FATIGUE CRACK PROPAGATION AND PLASTIC DEFORMATION ZONE OF CRACK TIP

DENG Rongying; YU Guiqing; LI He (Institute of Mechanics; Academia Sinica; Beijing)

邓蓉英;于桂清;李禾. 晶粒尺寸对奥氏体不锈钢疲劳裂纹低速扩展及其顶端塑性变形的影响[J]. 金属学报, 1986, 22(5): 53-150.
, , . EFFECT OF GRAIN SIZE ON SLOW FATIGUE CRACK PROPAGATION AND PLASTIC DEFORMATION ZONE OF CRACK TIP[J]. Acta Metall Sin, 1986, 22(5): 53-150.

摘要 参考文献 相关文章 Metrics 全文: PDF(1999 KB)   摘要: <正> 以往的研究结果表明,晶粒尺寸不仅影响材料的门坎值,而且也与常规机械性能特别是强度指标有一定的关系。为了解材料的门坎值、晶粒尺寸和强度之间的关系,本工作以奥氏体不锈钢为研究对象试图探索这一关系,同时用浮凸法研究晶粒尺寸对门坎值和低速扩展中裂纹顶端塑性变形的影响。 Abstract：Fatigue crack propagation threshold and slow propagation near it were studied at the constant amplitude of the cyclic load ratio, R=0.5 for three-point bend specimen of the austenite stainless steel. The effect of grain size on the plastic deformation of crack tip at the threshold and at slow propagation near it were investigated using the relief method. The results show that the threshold value of crack propagation increases linearly with the square root of grain size and the rate was slower for larger grain sized material. The proportionality factors of plastic deformation zone size of crack tip and (K_(max)/σ_z)~2 for various grain size are different at the threshold. The larger the grain size, the larger is the proportionality factor. At the same time, the distinction of the plastic deformation development is the uncontinuous and unsymmetric as da/dN is from 2×10~(-8)-10(-7)mm/cyc. A dimensionless criterion of crack starting propagation, n(△K_(th)/2σ_sd~(1/2)) which is constant for various grain size was obtained after the results of the test were put in order. Its physical significance is that fatigue crack starts to propagate when the square root of the ratio of the cyclic plastic zone size and grain size equals 0.6. The metallographic and SEM observations show that the crack propagation near the threshold of austenite stainless steel proceeds on the transgranular shear mode cyclic cleavage and plasticity tear. 收稿日期: 1986-05-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 邓蓉英 于桂清 李禾 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1986/V22/I5/53 1 郑哲敏,力学进展,12(1982) ,№ 2,133． 2 Nakai, Y.; Tanaka, K., Eng. Fract. Mech., 15 (1981) , 291． 3 Higo, Y.; Pickard, A.C.; Knott, J.F., Met. Sci., 15 (1981) , 233． 4 Robin, C.; Pluvinage, G., Mater. Struct., 3 (1980) , 287． 5 邓蓉英;李禾;于桂清,金属学报,20 (1984) ,A76． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed