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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Solution Annealing on Susceptibility to Intercrystalline Corrosion of Stainless Steel with 20% Cr and 8% Ni
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Effect of Solution Annealing on Susceptibility to Intercrystalline Corrosion of Stainless Steel with 20% Cr and 8% Ni

机译：固溶退火对Cr含量为20％，Ni含量为8％的不锈钢的晶间腐蚀敏感性的影响

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摘要

In general, as-received (AR) austenitic stainless steels (ASSs) contain complex carbide precipitates due to manufacturing operations, subsequent annealing treatment, or due to the fabrication processes such as welding. The presence of pre-existing carbides leads to cumulative sensitization and make the steel susceptible to intercrystalline corrosion (ICC)/intergranular corrosion (IGC) which causes premature failure during service. Solution annealing (SA) is one of the ways to deal with such situations. In this present investigation, the AR (hot rolled and mill annealed) chromium-nickel (Cr-Ni) ASS is compared with SA Cr-Ni ASS. The extent of ICC/IGC was evaluated qualitatively and quantitatively by various electrochemical tests including ASTM standard A-262 Practice A and Practice E, double loop electrochemical potentiokinetic reactivation and electrochemical impedance spectroscopy. The degree of sensitization for hot rolled mill annealed AR condition is found to be substantially higher (51.55%) than that of SA condition (26.9%) for thermally aged samples (at 700℃). The chemical composition across the grain boundary was measured using electron probe micro-analyzer for both (AR and SA) conditions and confirms that the pre-sensitization effect was completely removed after SA treatment.
机译：通常，由于制造操作，随后的退火处理或由于诸如焊接的制造过程，原样（AR）的奥氏体不锈钢（ASS）包含复杂的碳化物沉淀。预先存在的碳化物的存在会导致累积的敏化作用，并使钢易受晶间腐蚀（ICC）/晶间腐蚀（IGC）的影响，这会在使用期间导致过早失效。固溶退火（SA）是处理此类情况的方法之一。在本研究中，将AR（热轧和轧制退火）铬镍（Cr-Ni）ASS与SA Cr-Ni ASS进行了比较。通过各种电化学测试（包括ASTM标准A-262惯例A和惯例E，双环电化学电位动力学再活化和电化学阻抗谱）对ICC / IGC的范围进行了定性和定量评估。对于热老化的样品（在700℃），热轧退火退火条件的敏化度显着高于SA条件（26.9％）的敏化度（51.55％）。使用电子探针微分析仪在（AR和SA）两种条件下测量了整个晶界的化学成分，并证实了SA处理后完全消除了预敏化作用。

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