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On the Dissimilar Metal Welding of 1.4742 Ferritic to 310S Austenitic Stainless Steels Utilizing Different Filler Metals

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Abstract

In this work, the microstructural, mechanical, and physical properties of dissimilar welding between the 1.4742 ferritic and 310S austenitic stainless steels have been investigated. The welding was performed by the manual gas tungsten arc welding process utilizing ER310, ERNiCr-3, and ER446 filler metals. The weld metal microstructure of the ER310 and ERNiCr-3 filler metals was fully austenitic. The ER446 weld metal exhibited a ferritic-austenitic dual-phase microstructure. Carbide precipitates enriched with Cr, Fe, and or Nb were detected in all of the three weld metals. The unmixed zone was observed on both sides of the ERNiCr-3 weld metal, while for the ER310 and ER446 weld metals it was formed solely on one side. The ER446 weld metal displayed the maximum hardness values, 221.9 ± 5 HV, with relatively large fluctuations. The highest and lowest impact energy was achieved in the ERNiCr-3 weld metal, 40 ± 3 J, and ER446 weld metal, 25 ± 3 J, respectively. The ERNiCr-3 weld metal had a linear coefficient of thermal expansion (CTE) value about the mean value of the linear CTE of the two base metals. At last, for the dissimilar welding of these two base metals, it was concluded that the ERNiCr-3 filler metal is a better selection.

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Acknowledgements

Authors acknowledge the National Iranian South Oil Company (NIOC), Iran (Project No. 1397-DC-1271) and Shahid Chamran University of Ahvaz, Iran (Grant Nos. 97/3/02/26247 and 97/7/02/26247) for financial support.

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  1. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, 61357, Iran

    M. Amra, R. Dehmolaei & S. R. Alavi Zaree

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Amra, M., Dehmolaei, R. & Alavi Zaree, S.R. On the Dissimilar Metal Welding of 1.4742 Ferritic to 310S Austenitic Stainless Steels Utilizing Different Filler Metals. Metallogr. Microstruct. Anal. 8, 623–641 (2019). https://doi.org/10.1007/s13632-019-00574-9

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