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Microstructural evolution of AISI 4340 steel during Direct Metal Deposition process
Authors:S Bhattacharya  GP DindaAK Dasgupta  J Mazumder
Affiliation:a Center for Laser Aided Intelligent Manufacturing, University of Michigan, Ann Arbor, MI 48109, USA
b Center for Advanced Technologies, Focus: HOPE, Detroit, MI 48238, USA
Abstract:In the current investigation AISI 4340 steel was laser deposited on a rolled mild steel substrate by Direct Metal Deposition (DMD) technology. The microstructural investigation of the clad was performed using optical and electron microscopes and X-ray diffraction techniques. The microstructure consisted of ferrite, martensite and cementite phases. Two types of martensite, lathe-type and plate-type, were observed in the microstructure. Decrease in microhardness values from the top layer to the alloy layer proves that the degree of tempering of the martensite phase increases in the same direction. The lattice parameters of the identified phases were found to be shorter than those reported in literature. The reported parameters in literature are from samples processed under equilibrium conditions.
Keywords:Direct Metal Deposition  Clad  Microhardness  Tempering  Lattice parameters
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