Process modeling for solidification microstructure and transient thermal stresses in laser aided DMD process
type: CreativeWork
description: "Despite enormous progress in Laser Aided Direct Material Deposition (DMD) process adverse effects of process parameters on variety of properties and microstructure have been reported. De-bonding at substrate-deposition interface and cracking in deposited layers are a few that occur due to excessive stress build-up. Very high heating and cooling rates are inherent to this process. Consequently, the effects of solid state phase transformations cannot be neglected. A complete model that provides a quantitative relationship between process parameters, phase transformation kinetics, solidification parameters, thermal stresses and microstructure is highly desirable. This research deals with four key aspects of laser aided DMD. First, effect of solid state phase transformation on thermal stresses. Second, influence of high cooling rates on solidification microstructure at the scale of primary and secondary dendrite arm spacing. Third, effect of deposition patterns on both thermal stresses and solidification microstructure. And fourth, development of a fully coupled temperature-stress/strain field model"--Abstract, page iii.
abstract: "Despite enormous progress in Laser Aided Direct Material Deposition (DMD) process adverse effects of process parameters on variety of properties and microstructure have been reported. De-bonding at substrate-deposition interface and cracking in deposited layers are a few that occur due to excessive stress build-up. Very high heating and cooling rates are inherent to this process. Consequently, the effects of solid state phase transformations cannot be neglected. A complete model that provides a quantitative relationship between process parameters, phase transformation kinetics, solidification parameters, thermal stresses and microstructure is highly desirable. This research deals with four key aspects of laser aided DMD. First, effect of solid state phase transformation on thermal stresses. Second, influence of high cooling rates on solidification microstructure at the scale of primary and secondary dendrite arm spacing. Third, effect of deposition patterns on both thermal stresses and solidification microstructure. And fourth, development of a fully coupled temperature-stress/strain field model"--Abstract, page iii.
author: Ghosh, Suhash
keywords: Mechanical Engineering
date published: 2016-02-10T08:00:00Z
date modified: 2026-07-24T03:19:04Z
provider: Missouri University of Science and Technology
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Missouri--Rolla