共查询到14条相似文献,搜索用时 156 毫秒
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用自制的恒位移加载台,在透射电镜中原位观察310奥氏体不锈钢在纯水中局部溶解前后裂尖位错组态的变化以及微裂纹的形核和扩展。结果表明,310奥氏体在室温纯水中局部阳极溶解促进位错发射,增殖和运动,在低应力下,纳米级微裂纹在无位错区中连续或不连续形核,由于介质的作用,纳米级微裂纹并不钝化成空洞或缺口,而是理解扩展。 相似文献
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用激光云纹干涉法原位测量了应力腐蚀(SCC)前后缺口前端位移场的变化并进行TEM原位观察,结果表明。阳极溶解能使块状试样缺口前端塑性区及其变形量增大。当 溶解促进的局部塑性变形发展到临界条件,就会导致SCC微裂纹在无位错区中形核。α-Ti在甲醇溶液中表面钝化膜形成和保持过程中会在内界面产生较大的拉应力,它能协助外应力促进局部塑性变开有绕进而促进SCC裂纹形核。 相似文献
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研究了黄铜在静态腐蚀表面疏松层的应力状态,通过测量自由端挠度的变化及用SEM技术测量脱Zn层的厚度,计算了在脱Zn层和基体界面处生产的拉应力,其稳定值约等于黄铜屈服强度的1/5,在SCC过程中这个附加的拉应力将协助外应力促进位错发射和运动,从而SCC裂纹形核。 相似文献
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A constant deflection device designed for use within a transmission electron microscope (TEM) was used to investigate the change in dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of type 310 austenitic stainless steel in a boiling MgCl2 solution, and the initiation of stress corrosion microcracking. Results showed that crack tip corrosion processes during SCC-enhanced dislocation emission, multiplication and motion. SCC microcracks initiated when the corrosion-enhanced dislocation emission and motion had fully develop.A passive film formed during corrosion of austenitic stainless steel in the boiling MgCl2 solution generated a tensile stress. During SCC, the additive tensile stress generated at the metal/passive film interface assists the applied stress to enhance dislocation emission and motion. 相似文献
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