Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints
Pulsed direct current (PDC) gas tungsten arc welding (GTAW) of 12 mm thick plates of naval, marine-grade high strength low alloy steel (HSLA) using ER80S–Ni3 filler metal was investigated. The microstructural characteristics were examined by both optical microscopy and field-emission scanning electr...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422009656 |
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| author | Sameera J. Vaikar Varun Narayanan Joshy Chellathu George T.C. Kanish K. Devendranath Ramkumar |
| author_facet | Sameera J. Vaikar Varun Narayanan Joshy Chellathu George T.C. Kanish K. Devendranath Ramkumar |
| author_sort | Sameera J. Vaikar |
| collection | DOAJ |
| description | Pulsed direct current (PDC) gas tungsten arc welding (GTAW) of 12 mm thick plates of naval, marine-grade high strength low alloy steel (HSLA) using ER80S–Ni3 filler metal was investigated. The microstructural characteristics were examined by both optical microscopy and field-emission scanning electron microscopy (FE-SEM) techniques. The fusion zone is comprised of mixed microstructures of acicular ferrite (AF), polygonal ferrite (PF), grain boundary ferrite (GBF), and bainite ferrite (BF) laths in the various welding passes. The yield and tensile strengths of the PDCGTA weld joints were found to be superior to that of the base metal. A joint efficiency of 122% was observed for the weld seams while conducting the notch tensile studies (NTS). The impact toughness of the weld joints was higher than that of the base metal. The tensile and impact properties in the room temperature (RT) conditions were superior due to the formation of acicular ferrite (AF) and bainite ferrite (BF) laths in the weld seam microstructure. A higher toughness value of 173 J and ductile fracture mode was observed when the joints were impact loaded at −40 °C. On the other hand, the brittle cleavage fracture was observed for the joints subjected to impact loading at −196 °C. The impact toughness data indicated that the joints experienced a transition from a ductile to a brittle mode of fracture on lowering the temperature. |
| first_indexed | 2024-04-14T03:10:14Z |
| format | Article |
| id | doaj.art-3efa6e37ea8e4f5b8471154de8dd1f6f |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-14T03:10:14Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-3efa6e37ea8e4f5b8471154de8dd1f6f2022-12-22T02:15:36ZengElsevierJournal of Materials Research and Technology2238-78542022-07-011937243737Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld jointsSameera J. Vaikar0Varun Narayanan1Joshy Chellathu George2T.C. Kanish3K. Devendranath Ramkumar4School of Mechanical Engineering, VIT University, Vellore 632014, IndiaSchool of Mechanical Engineering, VIT University, Vellore 632014, IndiaSchool of Mechanical Engineering, VIT University, Vellore 632014, India; Technische Universität München, München, GermanySchool of Mechanical Engineering, VIT University, Vellore 632014, IndiaSchool of Mechanical Engineering, VIT University, Vellore 632014, India; Corresponding author.Pulsed direct current (PDC) gas tungsten arc welding (GTAW) of 12 mm thick plates of naval, marine-grade high strength low alloy steel (HSLA) using ER80S–Ni3 filler metal was investigated. The microstructural characteristics were examined by both optical microscopy and field-emission scanning electron microscopy (FE-SEM) techniques. The fusion zone is comprised of mixed microstructures of acicular ferrite (AF), polygonal ferrite (PF), grain boundary ferrite (GBF), and bainite ferrite (BF) laths in the various welding passes. The yield and tensile strengths of the PDCGTA weld joints were found to be superior to that of the base metal. A joint efficiency of 122% was observed for the weld seams while conducting the notch tensile studies (NTS). The impact toughness of the weld joints was higher than that of the base metal. The tensile and impact properties in the room temperature (RT) conditions were superior due to the formation of acicular ferrite (AF) and bainite ferrite (BF) laths in the weld seam microstructure. A higher toughness value of 173 J and ductile fracture mode was observed when the joints were impact loaded at −40 °C. On the other hand, the brittle cleavage fracture was observed for the joints subjected to impact loading at −196 °C. The impact toughness data indicated that the joints experienced a transition from a ductile to a brittle mode of fracture on lowering the temperature.http://www.sciencedirect.com/science/article/pii/S2238785422009656WeldingHigh strength low alloy steelMicrostructureNotch tensile strengthImpact toughness |
| spellingShingle | Sameera J. Vaikar Varun Narayanan Joshy Chellathu George T.C. Kanish K. Devendranath Ramkumar Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints Journal of Materials Research and Technology Welding High strength low alloy steel Microstructure Notch tensile strength Impact toughness |
| title | Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints |
| title_full | Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints |
| title_fullStr | Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints |
| title_full_unstemmed | Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints |
| title_short | Effect of weld microstructure on the tensile properties and impact toughness of the naval, marine-grade steel weld joints |
| title_sort | effect of weld microstructure on the tensile properties and impact toughness of the naval marine grade steel weld joints |
| topic | Welding High strength low alloy steel Microstructure Notch tensile strength Impact toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422009656 |
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