IMPACT OF FRICTION STIR PROCESSING ON THE FUSION-WELDED AISI 304 STAINLESS STEEL JOINTS: MICROSTRUCTURE, MECHANICAL AND FRACTURE BEHAVIOURS
- Authors
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Ojo, O.O
Federal University of Technology, Akure, PMB 704, Ondo State, Nigeria
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Babalola, W.O.
Federal University of Technology, Akure, PMB 704, Ondo State, Nigeria
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Mohammed, T.I
Federal University of Technology, Akure, PMB 704, Ondo State, Nigeria
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- Keywords:
- friction stir processing, AISI304 alloy, microstructure, mechanical property, fracture
- Abstract
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This work investigated the microstructure, mechanical properties, as well as fracture behaviour of the friction stir-processed fusion-welded AISI304 alloy. The AISI304 alloy plates were conventionally welded by a shielded metal arc welding (SMAW) technique in a regular butt geometry by using stainless electrode (AWS E308-16). Three rotational speeds of 710 rpm, 900 rpm, and 1120 rpm were utilised to perform the friction stir processing on the AISI304 weld zone using a cylindrical pinless tungsten carbide tool. The weld metals of the AISI304 austenitic stainless alloy plate were subjected to multiple surface FSP tool passes with lesser bulk plasticization. The results show that the non-uniform weld bead of the as-fusion-welded AISI304 joint was smoothened through the synergy of friction-induced metal shearing and plasticization effects. The inherent dendritic structures at the near-surface zones of the fusion welds were refined via tool-aided plasticization and dynamic recrystallization of the weld paths. The pinless tungsten carbide tool leaves a partially deformed zone (PDZ) and undeformed regions in the FSW-processed AISI304 joints. The increment in the tool speed (700 – 1120 rpm) improved the tensile strength of the FSW-processed AISI304 joints from 193 to 393 MPa. However, the highest tool rotational speed is better suited for the secondary processing of the hard as-fusion welded AISI304 joints due to the sufficient heat input required for plasticization.
- Author Biographies
- References
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