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Effects of shielding gases on the microstructure and localized corrosion of tube-to-tube sheet welds of super austenitic stainless steel for seawater cooled condenser |
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| Authors: | Soon-Tae Kim Seong-Yoon Kim In-Sung Lee Yong-Soo Park Min-Chul Shin Young-Sub Kim |
| Affiliation: | aDepartment of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;bMaterial Analysis Center, Korea Testing Laboratory, 222-13 Guro3-dong, Guro-gu, Seoul 152-718, Republic of Korea;cMaterial Research Division, Research Institute of Industrial Science and Technology, San 32 Hyoja-dong, Nam-gu, Pohang 790-600, Republic of Korea |
| Abstract: | The effects of shielding gas on the microstructure and localized corrosion of tube-to-tube sheet welds of SR-50A super austenitic stainless steel for seawater cooled condense were investigated in highly concentrated chloride environments. The localized corrosion resistance of the weld metal after welding with an Ar shielding gas supplemented with N2 increased due to a decrease in the pitting resistance equivalent number (PREN) difference between the PRENIR of interdendritic region and the PRENDC of dendrite core. The localized corrosion was selectively initiated at the dendrite core because the PREN of the dendrite core was smaller than that of the interdendritic region. |
| Keywords: | A Stainless steel B Polarization B EPMA C Segregation C Welding |
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