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首页> 美国卫生研究院文献>Materials >The Intergranular Corrosion Susceptibility of Metastable Austenitic Cr–Mn–Ni–N–Cu High-Strength Stainless Steel under Various Heat Treatments
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The Intergranular Corrosion Susceptibility of Metastable Austenitic Cr–Mn–Ni–N–Cu High-Strength Stainless Steel under Various Heat Treatments

机译：不同热处理条件下亚稳奥氏体Cr-Mn-Ni-N-Cu高强度不锈钢的晶间腐蚀敏感性

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摘要

The intergranular corrosion (IGC) behavior of a new metastable austenitic Cr–Mn–Ni–N–Cu high-strength stainless steel under various heat treatments was studied. The samples were solution treated at 1050 °C for 30 min and then aged at 600 to 900 °C for 10 to 300 min, respectively. The IGC susceptibility of aged samples was investigated using a double-loop electrochemical potentiokinetic reactivation (DL-EPR) test in a solution of 0.1 M H2SO4 and 0.002 M KSCN and the 10% oxalic acid etch. The surface morphologies of samples were characterized using optical microscopy and the scanning electron microscopy after electrochemical tests. Two time-temperature-sensitization diagrams were plotted based on the DL-EPR test and oxalic acid etching. No IGC and precipitate were observed for samples aged at 600 °C and 900 °C. For samples aged at 650 °C to 750 °C, the IGC susceptibility and the amount of precipitate both increased with the extended aging time. For samples aged at 800 °C and 850 °C, the amount of precipitate increased as the aging time was prolonged. However, only the sample aged at 800 °C for 60 min showed slight intergranular corrosion in the DL-EPR test. The IGC of the Cr–Mn–Ni–N–Cu austenitic stainless steel originated from the precipitation of Cr23C6 and Cr2N at the grain boundaries. The chromium-depleted zones near grain boundaries stood as the corrosion nucleation sites, but the dissolution of the weak area followed a consistent crystallographic orientation along each grain boundary.
机译：研究了新型亚稳奥氏体Cr-Mn-Ni-N-Cu高强度不锈钢在各种热处理条件下的晶间腐蚀（IGC）行为。将样品在1050°C下固溶处理30分钟，然后分别在600至900°C下老化10至300分钟。在0.1 M H2SO4和0.002 M KSCN溶液以及10％草酸蚀刻液中，使用双回路电化学电位动力学活化（DL-EPR）测试研究了老化样品的IGC敏感性。电化学测试后，使用光学显微镜和扫描电子显微镜表征样品的表面形态。根据DL-EPR测试和草酸蚀刻绘制了两个时间-温度-敏化图。在600°C和900°C下老化的样品均未观察到IGC和沉淀。对于在650°C至750°C下老化的样品，IGC敏感性和沉淀物量均随老化时间的延长而增加。对于在800°C和850°C下老化的样品，随着老化时间的延长，沉淀物的数量会增加。但是，只有在800°C下老化60分钟的样品在DL-EPR测试中显示出轻微的晶间腐蚀。 Cr-Mn-Ni-N-Cu奥氏体不锈钢的IGC源自晶界处Cr23C6和Cr2N的析出。靠近晶界的贫铬区域为腐蚀成核点，但薄弱区域的溶解沿每个晶界遵循一致的晶体学取向。

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