本文作者研究了不同冶炼条件和不同奥氏体化温度热处理的40CrNiMoA钢试样在蒸馏水中的应力腐蚀和腐蚀疲劳行为,测定了试样的原始奥氏体晶粒度,对晶界杂质偏聚情况进行了Auger电子能谱分析,对应力腐蚀和腐蚀疲劳断裂的初始阶段进行了扫描电镜断口观察。根据实验结果,作者认为高强度钢40CrNiMoA在蒸馏水中的应力腐蚀和腐蚀疲劳行为主要与原始奥氏体晶粒度有关。晶粒大小与裂纹前端塑性区尺寸两者的相对比较决定了断裂方式,从而决定了材料的应力腐蚀和腐蚀疲劳萌生和扩展的难易程度。
In the present work, the effect of prior austenite graiain size upon the stress corrosion cracking(SCC) and corrosion fatigue (CF)of 40CrNiMoA steel in distllied water was studied. The impurity segregations at grain boundaries of various prior austenite grain sizes resulted from different heat treatments were analysed by using Auger electron spectroscopy. The initial crack areas of fracture surfaces after either SCC or CF tests were observed under SEM. It was concluded that the behavior of both SCC and CF of 40CrNiMoA high strength steel in distilled water, in terms of its crack initiation as well as crack propagation, was mainly associated with the grain size, and the cracking modes were dependent upon the interactive relation between the grain size and the plastic zone ahead of the crack tips under tri-axial tensile stressing condition, thus determining the susceptibility to cracking.
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