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在应力腐蚀试验中发现,由常规恒载荷应力腐蚀试验所确定的耐应力腐蚀破裂性能很好的ICr20Mn13NB不锈钢,在45%MgC1_2沸腾溶液中预浸泡一定时间后再加载就会很快断裂.对于这种效应的机理进行了研究,结果表明:后加载应力腐蚀试验的本质是使试样在含足量氢的条件下发生滑移、塑变.钢中氢与钢中错位运动的相互作用是后加载造成迅速脆断的根本原因.
In the stress corrosion test, it was found that the ICr20Mn13NB stainless steel with good stress corrosion cracking resistance determined by the conventional constant-load stress corrosion test could be quickly broken after being pre-soaked in a 45% MgCl 2 boiling solution for a certain period of time. The results show that the nature of post-loading stress corrosion test is to make the sample slide and plasticize under the condition of containing enough hydrogen.The interaction between hydrogen in steel and dislocation in steel is The root cause of rapid brittle loading.