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Coupled Thermodynamic / Kinetic Analysis of Diffusional Transformations During Laser Hardening and Laser Welding

Research Area: Laser Materials Processing Year: 2001
Type of Publication: Article Keywords: Rapid austenitization; Computational thermodynamics; Kinetics; Dissolution; Coarsening; Weld thermal cycle
Authors:
Abstract:
Severnl important industrial material processes, such as welding and surface treatments with high energy beams, incorporate rapid IhcrIllnJ cycles characteri zed by high henling/cooling rates and sh0l1 dwell limes. COmpUl:llional si mulation of the evolution of microS!illClure under these ex treme condit ions has received rather limited attention. With the advct1\ of modern computntiollal tools regarding alloy thermodynamics and kinetics, it is possible to simulate the progress of diffu siolln l phnse tmnsforrnm ions nnd thus to pred ict microstructurnl development. In the present work, moving boundary diffusion problems hnve been simulnted for two cnses, In the first C,lse the rapid austenitizalion duri ng laser tmnsformotion hordening of n hypoeuteetoid steel was examined.
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