将预产生点蚀的1Cr18Ni9Ti疲劳试样进行长期(N>1×10~6cyc.)疲劳试验。其中一些在6％FeCl_3水溶液中进行,另一些在空气中进行。用定量金相方法逐个测量点蚀坑的直径和深度。发现点蚀坑的深径比和深度都与裂纹萌生有关,且在不锈钢点蚀坑的裂纹萌生过程中力学因素起主导作用而与碳钢完全不同。通过蚀坑底部的扫描电镜观察,分别确定了不锈钢和碳钢点蚀坑中裂纹萌生的初始位置,并依此讨论了腐蚀疲劳裂纹萌生机理。
Specimens of 1Cr_(18)Ni_9Ti stainless steel were pre-pitted and fatigue, some in 6%FeCl_3 solution and others in air, untill N>1×10~6 cyc. The geometric parameters, e.g. depth and diameter, of all pit were accurately measured by quantiative metallography. They were found to be effective on crack initiation. The pit-induced crack initiation is mainly due to mechanical factor for stainless steel, but quite different than carbon steel. After the specimens failed, the morphologies of pit bottoms were also examined by SEM for determining the initial sites of cracking. Thus, the mechanisms for pit-induced corrosion fatigue crack of these two typical steels were discussed.
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