Microstructure and Mechanical Properties of Inconel 617/AISI 310 Electron Beam Welds
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INTRODUCTION
NI-BASED superalloys like Inconel 617 have a good combination of high-temperature strength and oxidation resistance, due to possessing strengthening elements such as Co and Mo.[1,2] These materials have been widely used in various applications in power plants and chemical plants.[3] In most cases, Inconel 617 has been used in high temperature applications, while austenitic stainless steels have also been applied in moderately high temperature environments.[4] It has been reported that the dissimilar welding between the Inconel alloys and austenitic stainless steels is widely used in power planets, oil-refinery converters and furnace components; therefore, optimization of dissimilar welding between the Inconel superalloys and the austenitic stainless steel is important.[4–6]
MORTEZA SHAMANIAN, JALAL KANGAZIAN, and MOHAMMAD AMIR DERAKHSHI are with the Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran. Contact e-mail: [email protected]; [email protected] JERZY A. SZPUNAR is with the Department of Mechanical Engineering, University of Saskatchewan, Saskatoon SK S7N 5A9, Canada. Manuscript submitted November 29, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
Many researchers have studied the microstructure, weldability and mechanical properties of the welds in superalloys/stainless steels. Naffakh et al.[6] have, for instance, examined the weldability of the Inconel 657/ AISI 310 austenitic stainless steel using Varestraint testing techniques on dissimilar welds. The researchers employed gas tungsten arc welding (GTAW) and shielding metal arc welding (SMAW). The filler metals including Inconel 82, Inconel 617, Inconel A and 310 stainless steel were also used. They concluded that Inconel A improved the weldability of the joint due to the presence of a narrow solidification range and a small amount of secondary phases. In another work, Hosseini et al.[7] evaluated the microstructure and the mechanical properties of Inconel 617/AISI 310 dissimilar weldments. These researchers used GTAW methods and three types of filler metals including Inconel 82, Inconel 617, and 310 stainless steel. The results, which were obtained using Varestraint weldability tests indicated that the optimum mechanical properties could be achieved by applying the Inconel 617 filler metal. Mithilesh et al.[8] also reported the good weldability of the Inconel 625/AISI 304 stainless steel when using ERNiCrMo-3 filler metal and the GTAW process. Further, Mortezaie and Shamanian[9] recommended the use of the Inconel 82 filler metal to obtain the optimum mechanical properties of Inconel 718/AISI 310 dissimilar welds.
Recent advances in the applications of laser and electron beams have significantly increased their application to the welding of engineering alloys. Researchers have reported that employing a high power density heat input concentrated in a small area could result in an increase in the quality and strength of the weldments.[10,11] Ramkumar et al.[12] also investigated the
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