Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 39A, Issue 9, Pages 2237-2245Publisher
SPRINGER
DOI: 10.1007/s11661-008-9566-6
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The thermal behavior during laser-engineered net shaping (LENS) processing was numerically simulated using the alternate direction explicit finite difference method in Part I of this work. In this article, Part II, the numerical simulation results were compared to experimental results obtained with LENS-deposited 316L stainless steel. In particular, the cooling rate that is present during LENS deposition was established on the basis of dendrite arm spacing (DAS) measurements with and without a melt pool sensor (MPS) and a Z-height control (ZHC) subsystem. The microstructure of the deposited materials was characterized and analyzed, and the corresponding microhardness was measured as a function of distance from the substrate. The influence of thermal history on microstructure evolution was analyzed and discussed based on both modeling and experimental results. The results discussed in this article suggest relatively good agreement between experiments and modeling.
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