Influence of Medium Conductivity on Accuracy of Measuring Fatigue Crack Length by DCPD Method
摘 要
研究了高含量NaCl水溶液环境对直流电压降(DCPD)法测试腐蚀疲劳裂纹长度准确性的影响。结果表明:在同一裂纹长度下,随着溶液中NaCl含量的增加,DCPD法测得的电压降出现少量下降;不同NaCl含量溶液中拾取的DCPD信号变化均在±0.2%以内;溶质含量增加使得测得的裂纹长度与实际裂纹长度之间的差异增大,但是均在允许误差范围以内;与纯水相比,质量分数为0.5%的NaCl溶液加速了哈氏C-276合金的疲劳裂纹扩展速率约1.5倍,继续提高溶质含量对于促进疲劳裂纹扩展的效果不再显著。
Abstract
The effects of high content NaCl solution environment on the accuracy of measuring fatigue crack length by direct current potential drop (DCPD) method were studied. The results show that under the same crack length, the potential drop decreased slightly with the increase of NaCl content in the solution. The DCPD signal obtained in different solutions changed within ±0.2%. Higher NaCl content resulted in larger deviation between the tested crack length and the actual crack length. But all the deviations were within the allowed error range. Fatigue crack growth rate of the Hastelloy C-276 alloy in 0.5%NaCl solution increased by 1.5 times compared to that in pure water, but the crack growth rate changed slowly with the further increase of NaCl content in the solution.
中图分类号 TG174.3 TG146 DOI 10.11973/lhjy-wl201604001
所属栏目 试验与研究
基金项目 国家重点基础研究发展计划(973计划)资助项目(2014CB046701)
收稿日期 2015/6/18
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备注胡 梦(1990-),男,硕士研究生。
引用该论文: HU Meng,LI Zhi-jun,ZHANG Le-fu. Influence of Medium Conductivity on Accuracy of Measuring Fatigue Crack Length by DCPD Method[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2016, 52(4): 221~226
胡 梦,李志军,张乐福. 介质电导率对直流电压降法测试腐蚀疲劳裂纹长度准确性的影响[J]. 理化检验-物理分册, 2016, 52(4): 221~226
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【4】杜东海,陈凯,余论,等.直流电压降法测量核电结构材料在空气中的疲劳裂纹扩展速率[J].原子能科学技术,2014,48(8): 1386-1391.
【5】杜东海,余论,陈凯,等.直流电压降法应力腐蚀裂纹扩展速率在线测定试验系统[J].理化检验-物理分册,2014,50(1): 25-30.
【6】杜东海,张乐福,陈凯,等.X-750合金裂纹扩展速率的测量及 SO2-4离子对裂纹扩展速率的影响[J].核动力工程,2014,35(4): 163-167.
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【10】CHOPRA O K,RAO A S.A review of irradiation effects on LWR core internal materials-IASCC susceptibility and crack growth rates of austenitic stainless steels[J].Journal of Nuclear Materials,2011,409(3): 235-256.
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