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Violatos, Ioannis
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Publications (7/7 displayed)
- 2024Predicting fatigue crack initiation in milled aerospace grade Ti-6Al-4V parts using CPFEM
- 2023Determination of recrystallisation phenomenon in type 316 stainless steel VIM-VAR ingots during cogging operations
- 2023Residual stress distributions in dissimilar titanium alloy diffusion bonds produced from powder using field-assisted sintering technology (FAST-DB)citations
- 2022Digital twins for high-value components
- 2021Comparison between surface and near-surface residual stress measurement techniques using a standard four-point-bend specimencitations
- 2021On the evolution of microstructure and mechanical properties of type 316 austenitic stainless steel during ingot to billet conversion processcitations
- 2019Evolution of microstructure and crystallographic texture during dissimilar friction stir welding of duplex stainless steel to low carbon-manganese structural steelcitations
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document
Determination of recrystallisation phenomenon in type 316 stainless steel VIM-VAR ingots during cogging operations
Abstract
This study is focused on understanding the effects of key process parameters on the onset of recrystallisation of coarse, elongated, and dendritic grains of the as-cast microstructure during ingot-to-billet conversion, consisting of successive cogging, upsetting, and reheating operations, in type 316 austenitic stainless steel. The microstructural characteristics of the initial as-cast ingot (e.g., size, orientation and morphology of grains), and the complex thermo-mechanical path have significant impact on recrystallisation behaviours, which make the existing material models inefficient of precise microstructure prediction. These investigations aim at exploring the recrystallisation mechanisms and their dependency on the forging process parameters. Cogging trails were conducted on VIM-VAR stainless steel ingots and microstructural observations were made to identify the recrystallisation mechanisms. Finite element simulations coupled with constitutive material models were developed in parallel, to enable microstructurally informed prediction of the cogging process. Thus, static and discontinuous dynamic recrystallisations occur in succession after reaching a threshold level of deformation during cogging. Grain growth occurred in the statically recrystallised grains during reheating. The importance of the reheating and the associated static recrystallisation on the efficiency of the billet conversion process in terms of grain refinement is thus highlighted.