载荷对测定4340钢在海水中条件门槛值△K_(th)的影响

中国腐蚀与防护学报

1989, Vol. 9

Issue (2): 144-152

研究报告

本期目录 | 过刊浏览

载荷对测定4340钢在海水中条件门槛值△K_(th)的影响

张晓春;郑文龙

上海工业大学;上海材料研究所

THE INFLUENCE OF LOADING ON CONDITIONAL ΔK_(th) MEASURED ON 4340 STEEL IN SEAWATER

Zhang Xiaochun(Shanghai University of Technology) Zheng Wenlong(Shanghai Research Institute of Materials)

全文: PDF(1200 KB)

摘要: 采用四点弯曲腐蚀疲劳试验测定4340钢在人造海水中的△Kth,研究加载条件对测定△Kth的影响,并对门槛值附近裂纹扩展的形态进行观察。用降载法测得的△Kth值比升载法所测值低;门槛值附近裂纹扩展主要受机械应力控制,裂纹扩展形态以穿晶解理为主;阴极保护电位使条件门槛值△Kth稍有提高。在升载情况下,起始载荷越大,△Kth随之越高。合理选择初始临界应力强度因子范围是较精确地测得△Kth值的关键。

Abstract：Four-point-bending corrosion fatigue tests were used to obtain conditional thresholdst ress intensity range (ΔK_(th)) of 4340 steel in artificial seawater under different initial loading conaition. The morphology of crack propagation near threshold area was examined by scanning electron microscope Results showed that the AKth measured by decrease loading method was lower than that by increase loading method, In stage I of da/dN～ΔK1 curves, the dominant driving force of transgranular crack near the threshold is mechaniealo A slightly increased ΔK_(th) was observed as a consequence of the cathodic protection potential, It is very important to choose an initial. stress intensity factor range(ΔK_(th))in order to determine ΔK_(th) accurately.

收稿日期: 1989-04-25

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引用本文:

张晓春;郑文龙. 载荷对测定4340钢在海水中条件门槛值△K_(th)的影响[J]. 中国腐蚀与防护学报, 1989, 9(2): 144-152.
. THE INFLUENCE OF LOADING ON CONDITIONAL ΔK_(th) MEASURED ON 4340 STEEL IN SEAWATER. J Chin Soc Corr Pro, 1989, 9(2): 144-152.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1989/V9/I2/144

[1] ASTM E647-78T, ASTM, 705(1979)
[2] 北川(宀夫)夫,断裂力学(二)科技文献出版社重庆分社P.84(1976)
[3] 郑文龙,第二届SCC、CF、HE学术会议论文集,163(1987)
[4] 林栋梁,第二届SCC、CF、HE学术会议论文集,242(1987)
[5] 杨正瑞,陈雅珍,上海金属,7(6) ,11(1985)
[6] 徐培元、杨正瑞,上海金属,5(4) 11(1983)
[7] 小林英男,日本机械学会志,80,492(1977)
[8] ASTM D1141标准,(1979标准年鉴)
[9] 陈篪等,《工程断裂力学》,国防工业出版社,P.129,(1977)
[10] Gao Ming; Wei, R. P., Actematall. 32(11) 2118(1984)
[11] ASM,《金属手册10》,P.345,(1980)
[12] Broberg,K.B.,《断裂力学》,科技文献出版社,P.262． (1978)
[13] 蔡泽高等,《金属磨损与断裂》,上海交大出版社,P.97,(1985)

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