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首页> 外文期刊>Materials transactions >Investigation of the Resistance to Localized Corrosion Associated with Microstructure of Tube-to-Tube Sheet Welds of UNS S32050 Super Austenitic Stainless Steel for Seawater Cooled Condenser
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Investigation of the Resistance to Localized Corrosion Associated with Microstructure of Tube-to-Tube Sheet Welds of UNS S32050 Super Austenitic Stainless Steel for Seawater Cooled Condenser

机译：海水冷却冷凝器UNS S32050超级奥氏体不锈钢管对管薄板焊缝的耐局部腐蚀性能与显微组织的关系研究

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摘要

The behaviors of localized corrosion associated with microstructure of tube-to-tube sheet welds of UNS S32050 super austenitic stainless steel for seawater cooled condenser were investigated in highly concentrated chloride environments. In the interdendritic region, Cr and Mo as α-stabilizers were enriched and N as the y-stabilizer was depleted whereas in the dendrite core, Cr and Mo were depleted and N was enriched. Based on the PREN_(ir) and PREN_(DC) values, the localized corrosion was selectively initiated at the dendrite core (DC) because the PREN value of the dendrite core was much smaller than that of the interdendritic region (IR). It was found that the resistance to localized corrosion of the UNS S32050 SASS tube-to-tube sheet welds at least as good as that of a UNS S31254 SASS base metal with PREN 47 in highly acidified chloride environments.
机译：在高浓度氯化物环境下，研究了用于海水冷却冷凝器的UNS S32050超级奥氏体不锈钢的管对板焊接的局部组织腐蚀行为。在树突间区域，作为α-稳定剂的Cr和Mo富集，作为y-稳定剂的N贫化，而在树枝状核中，Cr和Mo贫化，N富集。基于PREN_（ir）和PREN_（DC）值，由于树枝状核的PREN值远小于树突间区域（IR）的PREN值，因此在树枝状核（DC）处选择性地引发了局部腐蚀。已经发现，在高度酸化的氯化物环境中，UNS S32050 SASS管对管板焊缝的局部腐蚀耐受性至少与具有PREN 47的UNS S31254 SASS基础金属的抗腐蚀能力一样。

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