在低碳钢/(1NNa_2CO_3+1NNaHCO_3溶液)系统中,曾经观察到光滑试样的应力腐蚀裂纹在低频交变载荷作用下出现早期扩展阻滞现象,本工作采用70/30黄铜光滑试样在1NNaNO_2水溶液中的应力腐蚀开裂对这一现象进行了研究分析。实验结果说明:该阻滞效应在细晶粒黄铜中比在粗晶粒黄铜中更为显著;前者在晶界或孪晶界形成的裂绞数目比后者的要多得多;采用预裂绞试样能够消除这一阻滞效应。用光滑试样表面多重裂绞萌生可对以上结果作出解释一多重萌生的裂纹在早期扩展阶段有效地分散了裂绞尖端的应变集中。
Smooth specimens of 70/30 brass exposed to 1N NaNO_2 aqueous solution were used to investigate the retardation of incipient stress corrosion crack growth under low frequency cyclic loading (LFCL), a phenomenon previously observed in smooth specimens of mild steel when tested in carbonate/bicarbonate solutions. It is shown that retardation was more pronounced in fine grained brass than in coarse grained brass. Additionally, a greater number of cracks formed at grain boundaries or twin boundaries in the fine grained than in the coarse grained material. The retardation effect on crack growth could be eliminated by the introduction of a pre-crack prior to testing. The results have been interpreted in terms of multiple crack initiations at smooth surfaces which effectively dispersed the strain concentration at crack tips in the incipient growth stage.
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