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Influence of filler materials on GTAW dissimilar welds: Inconel 718 and austenitic stainless steel 304L
https://orcid.org/http://orcid.org/0000-0003-3331-7293
The investigation carried out in the current study illustrates the dissimilar gas tungsten arc welding (GTAW) between Inconel 718 (IN 718) and austenitic stainless steel (ASS 304L) utilizing three different filler materials. This study utilizes Ni-based fillers (ERNiCrCoMo-1 (IN 617) and ERNiFeCr-2 (IN 718)), and austenitic filler ASS 304L and characterizes the relationship among microstructural and mechanical characteristics using identical weld parameters. The obtained dissimilar weld joint using Ni-based filler materials depicts no weld solidification cracking, whereas austenitic filler causes the weld solidification cracks. The microstructural characterizations were examined using optical and FESEM revealing the occurrence of columnar, cellular, and equiaxed dendritic structures in all three weld metals. FESEM/EDS analysis illustrates the occurrence of Mo and Cr-rich phases (M23C6 and Mo6C) in ERNiCrCoMo-1 weld metal, NbC, Mo/Ti–rich, and laves phases in ERNiFeCr- 2 weld metal and Cr- rich carbides in ASS 304L weld metals. EBSD assessment shows the improved texture of the weld metals through IPF and PF maps. The Vickers microhardness demonstrates the highest hardness value (271 HV5) for the ERNiFeCr- 2 weld metal due to the existence of the brittle intermetallic phases, and minimum in the case of ASS 304L weld metals (156 HV5). The ambient temperature tensile test exhibits the maximum (649 MPa) and minimum (404 MPa) UTS corresponding to ERNiCrCoMo-1 and ASS 304L weld metals respectively. The tensile specimens for all the weld metals experience fracture from the weld metals. The Charpy toughness values of the weld metals show lower values (ERNiCrCoMo-1 (70 J), ERNiFeCr-2 (56 J) and ASS 304L (32 J)) than the BMs (IN 718 (135 J) and ASS 304L (228 J). Residual stress analysis was conducted employing the deep hole drilling (DHD) technique, indicating that the highest residual stress occurs 2 mm below the top weld face, classified as tensile stress for all three used filler materials.
Influence of filler materials on GTAW dissimilar welds: Inconel 718 and austenitic stainless steel 304L
https://orcid.org/http://orcid.org/0000-0003-3331-7293
The investigation carried out in the current study illustrates the dissimilar gas tungsten arc welding (GTAW) between Inconel 718 (IN 718) and austenitic stainless steel (ASS 304L) utilizing three different filler materials. This study utilizes Ni-based fillers (ERNiCrCoMo-1 (IN 617) and ERNiFeCr-2 (IN 718)), and austenitic filler ASS 304L and characterizes the relationship among microstructural and mechanical characteristics using identical weld parameters. The obtained dissimilar weld joint using Ni-based filler materials depicts no weld solidification cracking, whereas austenitic filler causes the weld solidification cracks. The microstructural characterizations were examined using optical and FESEM revealing the occurrence of columnar, cellular, and equiaxed dendritic structures in all three weld metals. FESEM/EDS analysis illustrates the occurrence of Mo and Cr-rich phases (M23C6 and Mo6C) in ERNiCrCoMo-1 weld metal, NbC, Mo/Ti–rich, and laves phases in ERNiFeCr- 2 weld metal and Cr- rich carbides in ASS 304L weld metals. EBSD assessment shows the improved texture of the weld metals through IPF and PF maps. The Vickers microhardness demonstrates the highest hardness value (271 HV5) for the ERNiFeCr- 2 weld metal due to the existence of the brittle intermetallic phases, and minimum in the case of ASS 304L weld metals (156 HV5). The ambient temperature tensile test exhibits the maximum (649 MPa) and minimum (404 MPa) UTS corresponding to ERNiCrCoMo-1 and ASS 304L weld metals respectively. The tensile specimens for all the weld metals experience fracture from the weld metals. The Charpy toughness values of the weld metals show lower values (ERNiCrCoMo-1 (70 J), ERNiFeCr-2 (56 J) and ASS 304L (32 J)) than the BMs (IN 718 (135 J) and ASS 304L (228 J). Residual stress analysis was conducted employing the deep hole drilling (DHD) technique, indicating that the highest residual stress occurs 2 mm below the top weld face, classified as tensile stress for all three used filler materials.
Influence of filler materials on GTAW dissimilar welds: Inconel 718 and austenitic stainless steel 304L
https://orcid.org/http://orcid.org/0000-0003-3331-7293
The investigation carried out in the current study illustrates the dissimilar gas tungsten arc welding (GTAW) between Inconel 718 (IN 718) and austenitic stainless steel (ASS 304L) utilizing three different filler materials. This study utilizes Ni-based fillers (ERNiCrCoMo-1 (IN 617) and ERNiFeCr-2 (IN 718)), and austenitic filler ASS 304L and characterizes the relationship among microstructural and mechanical characteristics using identical weld parameters. The obtained dissimilar weld joint using Ni-based filler materials depicts no weld solidification cracking, whereas austenitic filler causes the weld solidification cracks. The microstructural characterizations were examined using optical and FESEM revealing the occurrence of columnar, cellular, and equiaxed dendritic structures in all three weld metals. FESEM/EDS analysis illustrates the occurrence of Mo and Cr-rich phases (M23C6 and Mo6C) in ERNiCrCoMo-1 weld metal, NbC, Mo/Ti–rich, and laves phases in ERNiFeCr- 2 weld metal and Cr- rich carbides in ASS 304L weld metals. EBSD assessment shows the improved texture of the weld metals through IPF and PF maps. The Vickers microhardness demonstrates the highest hardness value (271 HV5) for the ERNiFeCr- 2 weld metal due to the existence of the brittle intermetallic phases, and minimum in the case of ASS 304L weld metals (156 HV5). The ambient temperature tensile test exhibits the maximum (649 MPa) and minimum (404 MPa) UTS corresponding to ERNiCrCoMo-1 and ASS 304L weld metals respectively. The tensile specimens for all the weld metals experience fracture from the weld metals. The Charpy toughness values of the weld metals show lower values (ERNiCrCoMo-1 (70 J), ERNiFeCr-2 (56 J) and ASS 304L (32 J)) than the BMs (IN 718 (135 J) and ASS 304L (228 J). Residual stress analysis was conducted employing the deep hole drilling (DHD) technique, indicating that the highest residual stress occurs 2 mm below the top weld face, classified as tensile stress for all three used filler materials.
Influence of filler materials on GTAW dissimilar welds: Inconel 718 and austenitic stainless steel 304L
Arch. Civ. Mech. Eng.
Kumar, Niraj (author) / Kumar, Prakash (author) / Pandey, Chandan (author)
2024-09-10
Article (Journal)
Electronic Resource
English
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