Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si
This paper presents the microstructural characteristics and mechanical properties of linear friction-welded (LFWed) Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242) in as-welded (AWed) and stress relief-annealed (SRAed) conditions. The weld center (WC) of the AWed Ti-6242 consisted of recrystallized prior-β grain...
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| Online Access: | https://www.mdpi.com/1996-1944/14/1/30 |
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| author | Sidharth Rajan Priti Wanjara Javad Gholipour Abu Syed Kabir |
| author_facet | Sidharth Rajan Priti Wanjara Javad Gholipour Abu Syed Kabir |
| author_sort | Sidharth Rajan |
| collection | DOAJ |
| description | This paper presents the microstructural characteristics and mechanical properties of linear friction-welded (LFWed) Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242) in as-welded (AWed) and stress relief-annealed (SRAed) conditions. The weld center (WC) of the AWed Ti-6242 consisted of recrystallized prior-β grains with α’ martensite that were tempered during SRA at 800 °C for 2 h and transformed into an acicular α + β microstructure. The peak hardness values, obtained in the AWed joints at the WC, sharply decreased through the thermomechanically affected zones (TMAZs) to the heat-affected zone (HAZ) of the Ti-6242 parent metal (PM). The SRA lowered the peak hardness values at the WC slightly and fully recovered the observed softening in the HAZ. The tensile mechanical properties of the welds in the AWed and SRAed conditions surpassed the minimum requirements in the AMS specifications for the Ti-6242 alloy. Fatigue tests, performed on the SRAed welds, indicated a fatigue limit of 468 MPa at 10<sup>7</sup> cycles, just slightly higher than that of the Ti-6242 PM (434 MPa). During tensile and fatigue testing, the welds failed in the PM region, which confirms the high mechanical integrity of the joints. Both the tensile and fatigue fracture surfaces exhibited characteristic features of ductile Ti-6242 PM. |
| first_indexed | 2024-03-10T13:50:16Z |
| format | Article |
| id | doaj.art-52ae11752c9043d3a3290f52dceb660a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T13:50:16Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-52ae11752c9043d3a3290f52dceb660a2023-11-21T02:14:23ZengMDPI AGMaterials1996-19442020-12-011413010.3390/ma14010030Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1SiSidharth Rajan0Priti Wanjara1Javad Gholipour2Abu Syed Kabir3National Research Council Canada (NRC), Montréal, QC H3T 1J4, CanadaNational Research Council Canada (NRC), Montréal, QC H3T 1J4, CanadaNational Research Council Canada (NRC), Montréal, QC H3T 1J4, CanadaMechanical and Aerospace Department, Carleton University, Ottawa, ON K1S 5B6, CanadaThis paper presents the microstructural characteristics and mechanical properties of linear friction-welded (LFWed) Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242) in as-welded (AWed) and stress relief-annealed (SRAed) conditions. The weld center (WC) of the AWed Ti-6242 consisted of recrystallized prior-β grains with α’ martensite that were tempered during SRA at 800 °C for 2 h and transformed into an acicular α + β microstructure. The peak hardness values, obtained in the AWed joints at the WC, sharply decreased through the thermomechanically affected zones (TMAZs) to the heat-affected zone (HAZ) of the Ti-6242 parent metal (PM). The SRA lowered the peak hardness values at the WC slightly and fully recovered the observed softening in the HAZ. The tensile mechanical properties of the welds in the AWed and SRAed conditions surpassed the minimum requirements in the AMS specifications for the Ti-6242 alloy. Fatigue tests, performed on the SRAed welds, indicated a fatigue limit of 468 MPa at 10<sup>7</sup> cycles, just slightly higher than that of the Ti-6242 PM (434 MPa). During tensile and fatigue testing, the welds failed in the PM region, which confirms the high mechanical integrity of the joints. Both the tensile and fatigue fracture surfaces exhibited characteristic features of ductile Ti-6242 PM.https://www.mdpi.com/1996-1944/14/1/30blade-integrated disklinear friction weldingpost-weld heat treatmentstress relief annealingtitanium alloyTi-6Al-2Sn-4Zr-2Mo-0.1Si |
| spellingShingle | Sidharth Rajan Priti Wanjara Javad Gholipour Abu Syed Kabir Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si Materials blade-integrated disk linear friction welding post-weld heat treatment stress relief annealing titanium alloy Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title | Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title_full | Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title_fullStr | Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title_full_unstemmed | Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title_short | Microstructure, Tensile Properties, and Fatigue Behavior of Linear Friction-Welded Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| title_sort | microstructure tensile properties and fatigue behavior of linear friction welded ti 6al 2sn 4zr 2mo 0 1si |
| topic | blade-integrated disk linear friction welding post-weld heat treatment stress relief annealing titanium alloy Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
| url | https://www.mdpi.com/1996-1944/14/1/30 |
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