Microstructural development and solidification cracking susceptibility of a stabilized stainless steel
作者： J.N. DuPont
DOI:
关键词: Alloy 、 Metallurgy 、 Microstructure 、 Liquidus 、 Weldability 、 Laves phase 、 Cracking 、 Fusion 、 Materials science 、 Differential thermal analysis
摘要: The solidification behavior and fusion zone cracking response of Alloy 20Cb-3 was investigated by Varestraint testing, differential thermal analysis (DTA) microstructural characterization techniques including light optical microscopy (LOM), scanning electron (SEM) probe microanalysis (EPMA). paths each composition were calculated plotted on a [gamma]-Nb-C pseudo-ternary liquidus projection as an aid to understanding the influence alloy progression reaction sequences. Both autogenous composite 20Cb-3/INCO 112 zones exhibited higher degree susceptibility than 304 stainless steel. displayed highest propensity. A recently developed model utilized calculate variation in fraction liquid with distance within crack-susceptible solid + (mushy) for composition. modeling results directly showed that presence low temperature L [r arrow] ([gamma] Laves) extended mushy crack lengths observed this sample during testing. These used understand relation between composition, resultant response.
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