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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation of microstructure and electrochemical corrosion behavior of austenitic 316 stainless steel weld metals with varying chemical compositions
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Evaluation of microstructure and electrochemical corrosion behavior of austenitic 316 stainless steel weld metals with varying chemical compositions

机译：不同化学成分的奥氏体316不锈钢焊接金属的显微组织和电化学腐蚀行为的评估

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摘要

Austenitic stainless steel weld metals have, in general, inferior corrosion resistance compared with the base metals. This is due to the fact that the weld metal has an inhomogeneous and dendritic microstructure with microsegregation of major elements (i.e., Cr, Mo, and Ni) as well as minor elements (i.e., S and P) at the δ-γ interface boundaries. The nonuniform alloying element concentration around ferrite particles plays a major role in determining the electrochemical corrosion behavior of such weld metals. Although the presence of ferrite is considered to be detrimental as far as the localized corrosion is considered, its exact role in uniform corrosion is still not clear. The uniform corrosion behavior of an alloy is determined by the fundamental electrochemical parameters of the major alloying elements. In this study, an attempt has been made to correlate the microstructure and uniform corrosion behavior of type 316 stainless steel weld metals with varying concentrations of Cr and Mo, and different ferrite contents. From the empirical equations obtained during the analysis of the electrochemical corrosion data, an attempt has been made to understand the role of Cr, Mo, and ferrite in altering the electrochemical corrosion parameters of the weld metal. Based on the extensive microstructural characterization, a dissolution model for the weld metal in the moderately oxidizing medium has been proposed.
机译：与基础金属相比，奥氏体不锈钢焊接金属的耐腐蚀性一般较差。这是由于这样的事实：焊缝金属具有不均匀的枝晶组织，并且在δ-γ界面边界处主要元素（即Cr，Mo和Ni）以及次要元素（例如S和P）的微观偏析。 。铁素体颗粒周围不均匀的合金元素浓度在确定此类焊接金属的电化学腐蚀行为中起着重要作用。尽管就局部腐蚀而言，铁素体的存在被认为是有害的，但其在均匀腐蚀中的确切作用仍不清楚。合金的均匀腐蚀行为取决于主要合金元素的基本电化学参数。在这项研究中，已尝试将Cr和Mo浓度不同以及铁素体含量不同的316不锈钢焊接金属的显微组织和均匀腐蚀行为联系起来。根据在电化学腐蚀数据分析过程中获得的经验方程式，已尝试了解Cr，Mo和铁素体在改变焊接金属的电化学腐蚀参数中的作用。基于广泛的微观结构特征，提出了在中等氧化介质中焊缝金属的溶解模型。

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