Effect of heat input on microstructure and mechanical properties of dissimilar joints between super duplex stainless steel and high strength low alloy steel |
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| Affiliation: | 1. FMC Technologies, South America Technology Center – Technology Park, UFRJ, Cx. Postal CEP 21941-907, Rio de Janeiro, RJ, Brazil;2. Laboratório de Ensaios Não Destrutivos, Corrosão e Soldagem – LNDC, COPPE Universidade Federal do Rio de Janeiro – UFRJ, Cx. Postal 68505 CEP 21945-970, Rio de Janeiro, RJ, Brazil;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China;3. Center for Minimally Invasive Life Assessment of High Temperature Materials, Shenhua Guohua (Beijin) Electric Power Research Institute Company, Beijing 100025, China |
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| Abstract: | In the present study, microstructure and mechanical properties of UNS S32750 super duplex stainless steel (SDSS)/API X-65 high strength low alloy steel (HSLA) dissimilar joint were investigated. For this purpose, gas tungsten arc welding (GTAW) was used in two different heat inputs: 0.506 and 0.86 kJ/mm. The microstructures investigation with optical microscope, scanning electron microscope and X-ray diffraction showed that an increase in heat input led to a decrease in ferrite percentage, and that detrimental phases were not present. It also indicated that in heat affected zone of HSLA base metal in low heat input, bainite and ferrite phases were created; but in high heat input, perlite and ferrite phases were created. The results of impact tests revealed that the specimen with low heat input exhibited brittle fracture and that with high heat input had a higher strength than the base metals. |
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| Keywords: | Dissimilar welding Super duplex stainless steels High strength low alloy steel Heat input Microstructure Mechanical properties |
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