| 摘要: |
| 关于奧氏体不锈钢在氯化物溶液中的应力腐蚀开裂(SCC),有人认为受阳极溶解控制,有人认为受氢脆控制。Jani等(1991)通过透射电子显微技术研究了奥氏体不锈钢在沸腾MgCl2溶液中的SCC,结果表明,氢能进入金属诱发马氏体相变,使不锈钢发生脆性断裂,提出了奥氏体不锈钢SCC的氢脆机理。乔利杰等(1987,1988)对304,321,310不锈钢在沸腾MgCl2溶液中的SCC的研究表明,在SCC过程中氢确实能进入金属,但其浓度不足以引发氢脆,发生SCC的门槛应力强度因子KISCC低于发生氢脆时的应力强度因子KIHC,虽然氢在SCC过程中不起控制作用,但却能加速不锈钢的阳极溶解过程,应力和氢对不锈钢的阳极溶解过程存在协同效应。奥氏体不锈钢在酸性氯离子溶液中发生SCC时,氢的产生是必然的,因而有必要研究氢在SCC过程中所起的作用。同时我们注意到Jani等(1991)所做的研究是在断裂后的试样断口上进行的,他们得出的实验结果是否能反映裂尖的情况,马氏体相变是否是在裂尖前沿首先发生等问题,我们认为是值得进一步深入探讨的。只有对裂尖和已经形成的裂纹表面同时进行观察研究,才能反映真实的SCC过程。本文通过氢对不锈钢阳极溶解的影响,透射电镜观察,X射线衍射等实验初步探讨了氢对奥氏体不锈钢于酸性氯离子溶液中SCC的作用,以便为应力腐蚀开裂机理研究提供证据。 |
| 关键词: 氢、奥氏体不锈钢、氯化物溶液、腐蚀开裂 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第3059号
国家自然科学基金项目，59171055号 |
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| EFFECTS OF HYDROGEN ON THE SCC OF AUSTENITIC STAINLESS STEEL IN ACIDIC CHLORIDE SOLUTION |
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Huang Yanliang1, Cao Chunan2, Lin Haichao2, Hou Baorong1
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences, State Key Laboratory of Corrosion and Protection
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| Abstract: |
| The effects of hydrogen in SCC(Stress Corrosion Cracking )by electrochemical method,transmission electron microscopy(TEM) and X-ray diffraction were studied. The results showed that hydrogen can diffuse into the metal and induces martensite phase transformation.Howewer the martensite was not formed at the crack tip but on the side wall of the crack, so the possibility of crack propagation caused by martensite breakdown is low. Although hydrogen probably did not play the main role in the SCC of stainless steel, the anodic dissolution was increased by it. |
| Key words: HYDROGEN,SCC,AUSTENITIC STAINLESS STEEL,ACIDIC CHLORIDE SOLUTION |
