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Influence of microstructure and mechanical properties of dissimilar rotary friction welded inconel to stainless steel joints
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Beeravolu, Akhil Reddy, Babu, Nagumothu Kishore, Talari, Mahesh Kumar, Rehman, Ateekh Ur and Srirangam, Prakash (2023) Influence of microstructure and mechanical properties of dissimilar rotary friction welded inconel to stainless steel joints. Materials, 16 (8). 3049. doi:10.3390/ma16083049 ISSN 1996-1944.
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Official URL: https://doi.org/10.3390/ma16083049
Abstract
The present study aims to evaluate the microstructure, grain size, and mechanical properties of the dissimilar AISI 316L/Inconel 718 (IN 718) rotary friction welded joints under both the as-welded and post-weld heat treatment (PWHT) conditions. Because of reduced flow strength at elevated temperatures, the AISI 316L and IN 718 dissimilar weldments exhibited more flash formation on the AISI 316L side. At higher rotating speeds during friction welding, an intermixing zone was created at the weld joint interface due to the material softening and squeezing. The dissimilar welds exhibited distinctive regions, including the fully deformed zone (FDZ), heat-affected zone (HAZ), thermo-mechanically affected zone (TMAZ), and the base metal (BM), located on either side of the weld interface. The dissimilar friction welds, AISI 316L/IN 718 ST and AISI 316L/IN 718 STA, exhibited yield strength (YS) of 634 ± 9 MPa and 602 ± 3 MPa, ultimate tensile strength (UTS) of 728 ± 7 MPa and 697± 2 MPa, and % elongation (% El) of 14 ± 1.5 and 17 ± 0.9, respectively. Among the welded samples, PWHT samples exhibited high strength (YS = 730 ± 2 MPa, UTS = 828 ± 5 MPa, % El = 9 ± 1.2), and this may be attributed to the formation of precipitates. Dissimilar PWHT friction weld samples resulted in the highest hardness among all the conditions in the FDZ due to the formation of precipitates. On the AISI 316L side, prolonged exposure to high temperatures during PWHT resulted in grain growth and decreased hardness. During the tensile test at ambient temperature, both the as-welded and PWHT friction weld joints failed in the HAZ regions of the AISI 316L side.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TS Manufactures |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Friction welding, Welded joints, Inconel -- Mechanical properties, Inconel -- Microstructure | ||||||
| Journal or Publication Title: | Materials | ||||||
| Publisher: | MDPI | ||||||
| ISSN: | 1996-1944 | ||||||
| Official Date: | 12 April 2023 | ||||||
| Dates: |
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| Volume: | 16 | ||||||
| Number: | 8 | ||||||
| Article Number: | 3049 | ||||||
| DOI: | 10.3390/ma16083049 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 18 July 2023 | ||||||
| Date of first compliant Open Access: | 18 July 2023 | ||||||
| RIOXX Funder/Project Grant: |
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