Fe-3%Si单晶氢致解理断裂研究

中国腐蚀与防护学报

1987, Vol. 7

Issue (2): 103-111

研究报告

本期目录 | 过刊浏览

Fe-3%Si单晶氢致解理断裂研究

王燕斌;褚武扬;肖纪美

北京钢铁学院金属物理教研室;北京钢铁学院金属物理教研室;北京钢铁学院金属物理教研室

HYDROGEN INDUCED CRACKING IN Fe-Si SINGLE CRYSTAL

Wang Yanbin Chu Wuyang Hsiao Chimei (Beijing Univ. of Iron and Steel Technology)

全文: PDF(2486 KB)

摘要: 用Fe-3％Si单晶试样对氢致解理断裂进行了研究。结果表明,Fe-3％Si单晶缺口试样在空气中拉伸时一般不发生解理,但在动态充氢条件下,即使室温慢加载也能产生解理断裂。对于Ⅰ+Ⅱ复合型试样,氢致裂纹并不沿断裂力学预示的开裂角扩展,而是沿解理面扩展,即氢促进了解理断裂。无论Ⅰ型还是复合型,氢致解理裂纹的da/dt—KⅠ曲线都由三个阶段组成,但Ⅰ型试样da/dt的平台值明显地比复合型的高。用各向异性断裂力学计算了作用在裂纹前各滑移系上的分切应立力,并配合断口观察确定了解理裂纹形核机理。研究了氢的促进作用。

Abstract：Hydrogen induced cleavage fracture for Fe-3% si single crystal and polycrystals was investigated. The results showed that a cleavage fracture occurred during dynamic charging at the slow strain rate test or under constant load at room temperature, and hydrogen induced cracking under a Ⅰ+Ⅱ combined loading propagated along the(001)cleavage plane insead of the direction predicted on the basis of the fracture criterion under the combined loading. Macroscopic hydrogen intergranular fracture was a result of cleavage fracture along the (100), (010) and (001) planes in the immediate vicinity of the grain boundary. For the Fe-Si single crystal,da/dt vs K_1 curve also consisted of three parts and the plateau velocity under mode Ⅰ loading was larger than that under combined loading. Fractographic study and stress analysis indicated that a set of the<001> Sessile dislocation was just acleavage microcrack for the Fe-Si alloy. Hydrogen carried by the gliding dislocations would enter into the microcrack and the hydrogen pressure in the mierocrack could augment the external stress and promote the formation of a stable cleavage crack.

收稿日期: 1987-04-25

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引用本文:

王燕斌;褚武扬;肖纪美. Fe-3%Si单晶氢致解理断裂研究[J]. 中国腐蚀与防护学报, 1987, 7(2): 103-111.
. HYDROGEN INDUCED CRACKING IN Fe-Si SINGLE CRYSTAL. J Chin Soc Corr Pro, 1987, 7(2): 103-111.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1987/V7/I2/103

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