THRESHOLD FATIGUE CRACK EXTENSION CHARACTERISTICS OF A LOW-ALLOY STEEL - THE INFLUENCE OF ENVIRONMENT AND MICROSTRUCTURE

被引：1

作者：

BULLOCH, JH

机构：

[1] Electricity Supply Board, Lower Fitzwilliam Street

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 1991年 / 47卷 / 03期

关键词：

D O I：

10.1016/0308-0161(91)90034-Y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present investigation is aimed at examining the influence of environment and microstructure on the fatigue crack extension behaviour of a low alloy steel. Significant environmental effects were recorded under low R-Ratio testing but not under high R-Ratio conditions, viz., the DELTA-K(th) values recorded in salt solution were significantly larger than those for a dry air environment and a constant value of 10 MPa square-root m was recorded irrespective of microstructure (yield strength). Such effects were attributed to oxide induced closure effects. Above threshold, environmental assisted cracking behaviour in the salt solutions was the result of the appearance of transgranular cleavage facets on the fatigue surfaces. The extent of this environmentally enhanced cracking was simply related to the extent of cleavage failure.

引用

页码：317 / 331

页数：15

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