James Damon

TL;DR: In this paper, the porosity distribution and morphology of laser melted rotation bending test samples before and after shot peening were investigated by means of micro-tomography analysis, which showed that porosity shrinkage could be achieved in near-surface areas (0-500μm), but also in depths that did not seem accessible via shot-peening, leading to an overall relative porosity reduction between 15-30%.

TL;DR: In this paper, the authors investigate the correlation between build orientation characteristics, part porosity and mechanical properties of the fused filament fabrication (FFF) process to provide insight into pore formation mechanisms and to establish guidelines for optimal process configurations.

TL;DR: In this article, a detailed analysis of selective laser melting (SLM) fracture surfaces was carried out on the X3NiCoMoTi18-9-5 (or 18Ni300) maraging steel and the results revealed a highly anisotropic fatigue performance dependent on the build direction.

TL;DR: In this article, the intrinsic heat treatment during laser powder bed fusion (LPBF) was carried out using an inverse transient Hollomon-Jaffe approach to determine the low hardness found in the LPBF process of AISI 4140 and the effect of bed pre-heating on the final material tempering state was found to be negligible.

TL;DR: In this paper, a multiphysical FE-model for the whole quench-and-temper process has been developed and validated, and a good agreement with the experiments for the relevant mechanical properties hardness and residual stress could be achieved.