About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
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Symposium
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Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
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Presentation Title |
Tensile Deformation Characteristic and SASH Modeling of Superni 625 Alloy: Synergistic Effects of Coarse-Grain Size, Phase Transformation and Deformation Micromechanisms |
Author(s) |
Sonika -, Suhrit Mula |
On-Site Speaker (Planned) |
Sonika - |
Abstract Scope |
Ni-based superalloy 625 has emerged as a promising candidate for high-temperature applications. The present study investigated the evolution of phases, tensile properties and deformation behavior of cast alloy 625 (HN) with ageing treatment. The experimental work includes the ageing treatment of cast alloy 625 at 700oC up to 1000h followed by mechanical characterization and microstructural analysis of aged samples using SEM-EDS and TEM. The results revealed γ'' precipitates as the major strengthening phase. The average precipitate size and area fraction of γʺ phase increased gradually with ageing time. Primary MC-type carbides transformed into secondary carbides through following reactions: (I)MC+γ→M23C6 and (II)MC+ γ→M23C6 + δ. The yield strength(YS) increased till 650h (610MPa) along with reduction in ductility. A non-conventional slip-to-twin transition in the shearing of γʺ phase is attributed to the lowering of YS on further ageing. |