INCIDENCE OF HEAT TREATMENT ON THE CORROSIVE BEHAVIOR OF AISI 316L AUSTENITIC STAINLESS STEEL

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING
Mariano Nicolás Inés, Graciela Analía Mansilla
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Abstract

Heat treatments of AISI 316L samples were conducted at 900°C with slow cooling in air to induce varied precipitation of chromium-rich carbide particles at grain boundaries, resulting in a microstructure susceptible to intergranular corrosion. The corrosion behavior of the material in this state was investigated in a salt spray chamber containing 5% NaCl. The temperature inside the chamber was set at 35°C, while the saturated air temperature was recorded at 47°C. Samples were periodically extracted for observation and analysis using a stereoscopic magnifying glass, optical microscope, and scanning electron microscope. The results revealed the detrimental effect of chloride ions on the corrosion behavior of these stainless steels. Metallographic examination of corroded specimens after the salt spray test confirmed that the passive layer's breakdown was responsible for the intergranular corrosion occurring along preferential paths of chromium carbides.
热处理对aisi 316l奥氏体不锈钢腐蚀行为的影响
对AISI 316L试样进行900℃空气缓慢冷却热处理,在晶界处析出不同形式的富铬碳化物颗粒,形成易发生晶间腐蚀的显微组织。在含5% NaCl的盐雾室中研究了这种状态下材料的腐蚀行为。室内温度设定为35℃,饱和空气温度记录为47℃。定期抽取样品,用立体放大镜、光学显微镜、扫描电镜观察分析。结果表明氯离子对这些不锈钢的腐蚀行为有不利影响。盐雾试验后腐蚀试样的金相检查证实,钝化层的击穿是导致沿碳化铬优先路径发生晶间腐蚀的原因。
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来源期刊
Acta Metallurgica Slovaca
Acta Metallurgica Slovaca METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
2.00
自引率
30.00%
发文量
22
审稿时长
12 weeks
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