The Effect of Weld Metal Composition on Microstructural and Mechanical Properties of Dissimilar Welds Between Monel 400
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JMEPEG https://doi.org/10.1007/s11665-019-04328-0
The Effect of Weld Metal Composition on Microstructural and Mechanical Properties of Dissimilar Welds Between Monel 400 and Inconel 600 Naser Aminipour and Reza Derakhshandeh-Haghighi (Submitted April 22, 2018; in revised form April 30, 2019) The current work was carried out to characterize welding of Inconel 600 superalloy and Monel 400. In the present study, gas tungsten arc welding (GTAW) with four types of filler metals (ENiCu, ENiCu-7, ENiCr-3 and ENiCrFe-3) was utilized. The filler metals were categorized into two groups based on the presence of Cr and Nb in their chemical composition. This paper describes the selection and application of welding consumables in manufacturing dissimilar metal combinations. It was found that (Nb/Cr) ratio and Fe content can affect on the size and amount of carbides. During solidification of ENiCr-3 and ENiCrFe-3 filler metals, Nb leaves dendritic cores and is rejected to inter-dendritic regions because of its high tendency for segregation. However, No brittle Laves phase was detected in the welds. The interface between weld metal and base metal and gradual changes in alloying elements were also investigated by scanning electron microscopy. EDX analysis was also applied for different samples. Microhardness measurements and tensile test were performed on the joints. The average hardness value in the weld metal obtained from ENiCrFe-3 is higher than the other welds. ENiCu-7 weld exhibited the highest tensile strength of 540 MPa and percent elongation of 53% in contrast to ENiCrFe-3 weld with the lowest tensile strength (518 MPa) and percent elongation (39%). Keywords
dissimilar metal welding, Inconel 600, microstructural characterization, Monel 400
1. Introduction A useful nickel-copper alloy which is more corrosion resistant than stainless steel is Monel 400. Its good ductility along with its good corrosion resistance makes it very interesting for various applications such as marine equipment, chemical and hydrocarbon processing equipment, tubing of steam generators in water-cooled nuclear reactors or pressurized water reactors, valves, and heat exchangers (Ref 1). Inconel 600 as a nickel-based solid solution superalloy with a nickel-chromium matrix is widely utilized in pressurized water nuclear reactors, chemical and petrochemical industries due to its higher strength, corrosion and creep resistance at elevated temperatures. Dissimilar metal welding (DMW) is extensively used to join two different alloys in various industrial applications. Dissimilar welding of Ni-based alloys is very important for chemical industries and nuclear plants. However, because of difference in thermal expansion coefficient and chemical composition dissimilar metal welding seems to be more difficult than welding similar metals (Ref 2, 3). Liquation cracking in heat-affected zone (HAZ), solidification cracking,
Naser Aminipour, Department of Materials Science and Engineering, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran; and Reza Derakhs
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