超高强度钢CF裂纹扩展的超载效应　Ⅱ.试验验证与分析

中国腐蚀与防护学报

1994, Vol. 14

Issue (3): 193-200

研究报告

本期目录 | 过刊浏览

超高强度钢CF裂纹扩展的超载效应　Ⅱ.试验验证与分析

路民旭;郑修麟

西北工业大学

EFFECTS OF OVERLOADING ON CORROSION FATIGUE CRACK GROWTH FOR ULTRA-HIGH STRENGTH STEEL-Ⅱ.EXPERIMENTAL VERIFICATION AND ANALYSIS

Lu Minxu; Zheng Xiulin(Northwestern Polytechnical University)

全文: PDF(2559 KB)

摘要: 对ＧＣ－４（４０ＣｒＭｎＳｉＭｏＶＡ）钢在空气与３．５％ＮａＣｌ中性溶液中腐蚀疲劳裂纹扩展（ＣＦＣＧ）的单次超载与周期超载效应进行了试验性研究．结果表明，ＣＦＣＧ超载迟滞效应由快速撕裂过程，迟滞过程和恢复过程组成．对于周期超载，当两次超载周次之间裂纹扩展长度ａｄ远小于超载塑性区尺寸ｒｐＯＬ与恒载塑性区尺寸ｒｐＣＬＡ之差，即ａｄ＜＜ｒｐＯＬ－ｒｐＣＬＡ时，ＣＦＣＧ会发生比空气疲劳时还强烈的超载迟滞效应．而当ａｄ＞ｒｐＯＬ－ｒｐＣＬＡ时，会发生超载加速效应．断口分析表明，当ａｄ＜＜ｒｐＯＬ－ｒｐＣＬＡ时，ＣＦＣＧ不会发生超载撕裂，而当ａｄ＞ｒｐＯＬ－ｒｐＣＬＡ时，会发生显著的超载撕裂．上述试验的宏观规律与断口特征均验证了前文所建立的ＣＦＣＧ超载效应的定量描述模型．

关键词 ：腐蚀疲劳裂纹扩展, 单次超载, 周期超载, 超载迟滞效应, 超载加速效应

Abstract：Experimental studies were conducted on the effects of single and periodic overloading oh corrosion fatigue crack growth (CFCG) in the two commonly used environments, air and 3.5% NaCl neutral solution,for GC-4 (40CrMnSiMoVA) steel. Test results show that the whole process of the effect of overloading on CFCG involves three phases in time sequence: the fast tearing, the retardation, and the recovery. For periodic overloading tests, if the crack length, ad, grown during the interval of two overloading cycles were far smaller than the difference between the overloading plastic region size, rpOL, and the constant plastic region size rpCLA, i.e. ad <

Key words： Corrosion fatigue crack growth simple overloading periodic overloading overloading retardation

收稿日期: 1994-06-25

基金资助:国家自然科学基金

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路民旭;郑修麟. 超高强度钢CF裂纹扩展的超载效应　Ⅱ.试验验证与分析[J]. 中国腐蚀与防护学报, 1994, 14(3): 193-200.
. EFFECTS OF OVERLOADING ON CORROSION FATIGUE CRACK GROWTH FOR ULTRA-HIGH STRENGTH STEEL-Ⅱ.EXPERIMENTAL VERIFICATION AND ANALYSIS. J Chin Soc Corr Pro, 1994, 14(3): 193-200.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1994/V14/I3/193

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