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首页> 外文期刊>Journal of Materials Engineering and Performance >Enhancement of Corrosion Resistance of Type 304 Stainless Steel Through a Novel Thermo-mechanical Surface Treatment
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Enhancement of Corrosion Resistance of Type 304 Stainless Steel Through a Novel Thermo-mechanical Surface Treatment

机译：通过新型热机械表面处理提高304型不锈钢的耐腐蚀性

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摘要

The paper describes a novel thermo-mechanical surface treatment approach, involving conventional shot blasting followed by laser surface heating, to engineer microstructural modification in type 304 austenitic stainless steel for enhancing its corrosion resistance. Thermo-mechanical surface treatment resulted in the formation of fine recrystallized grains with some strain-induced martensite on the modified surface. Surface treatment of type 304 stainless steel brought about significant improvement in its resistance against uniform as well as pitting corrosion. Electrochemical impedance spectroscopic studies showed improved polarization resistance (R_p) value for thermo-mechanically treated surface indicating formation of a more protective passive film than that formed on the untreated surface. In contrast to untreated type 304 stainless steel specimens where pits preferentially initiated at the site of Al_2O_3 inclusions, thermo-mechanically treated specimen exhibited only general dissolution with a few repassivated and shallow pits. Grain refinement and dispersion of alumina inclusions on the modified surface are considered to be the key factors responsible for improvement in uniform and pitting corrosion resistance of type 304SS.
机译：本文介绍了一种新颖的热机械表面处理方法，该方法包括先进行喷丸处理，再进行激光表面加热，以对304型奥氏体不锈钢进行微观结构改性，以增强其耐腐蚀性。热机械表面处理导致在改性表面上形成细小的重结晶晶粒，并带有一些应变诱发的马氏体。 304型不锈钢的表面处理显着提高了其抗均匀性和抗点蚀性。电化学阻抗谱研究显示，经过热机械处理的表面的极化电阻（R_p）值有所提高，这表明与未处理的表面相比，形成了更具保护性的钝化膜。与未经处理的304型不锈钢试样（在Al_2O_3夹杂物的位置优先产生凹坑）相比，经热机械处理的试样仅表现出一般的溶解性，并具有少量的钝化和浅凹坑。晶粒细化和氧化铝夹杂物在改性表面上的分散被认为是改善304SS型耐均匀性和抗点蚀性的关键因素。

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