阳极溶解及氢进入对裂纹尖端局部材料力学行为的作用

在腐蚀疲劳过程中裂纹尖端阳极溶解及氢产生并进入材料内部两个过程同时存在.材料的阳极溶解过程增大裂尖塑性区尺寸,氢产生并进入材料内部减小裂尖塑性区尺寸.提出如果阳极溶解增大裂尖塑性区尺寸起主导作用,则总体上表现为裂尖塑性区尺寸增大,如果氢进入减小塑性区尺寸起主导作用,则总体上表现为裂尖塑性区尺寸减小.对上述设想给予实验验证.

EFFECT OF ANODIC DISSOLUTION AND HYDROGEN ENTRANCEON MECHANICAL PROPERTIES OF MATERIAL AT CRACK TIP

Anodic dissolution (AD) and hydrogen formation occur simultaneously at corrosionfatigue (CF) crack tip. The AD of material increases the plastioc zone size at CF crack tip, whilethe entrance of hydrogen into material decreases size of the plastic zone at CF crack tip. In fact,the size of plastic zone at crack tip depends on the competition of the above two aspects, i.e., thesize of the plastic zone at the crack tip will decrease if hydrogen entrance plays a dominant role orincrease if AD plays a dominant role. It was proven by the experiment.