A Numerical Study of a Cooling Ratio for Laser Based Prototyping Technology with a Sample of 316l Stainless Steel

Abstract

The objectives of this work are to study Laser Engineered Net Shaping (LENS TM) produced materials and identify the microstructures. Numerical method was used to examine the influence of materials' type and LENS TM process parameters on the forming of the specific microstructures from thermodynamics and fluid dynamics point of view. Samples of 316L stainless steel were examined, microstructures of samples were used to estimate the corresponding cooling rate, and the cooling rate was compared with the results of three different levels of simplified models.

Fatigue and fracture behaviour of laser powder bed fusion stainless steel 316L: Influence of processing parameters

“…According to the solidification theory, dendrite cell size is controlled by the cooling rate. In the context of this work, the Rosenthal solution and finite element results indicate that lower laser power generates higher cooling rate [52,53], and thereby finer dendrite structure. Thus, according to the Hall-Petch equation, the coarser subgrains in 1.5P0 could have contributed to the lower strength.…”