Influence of porosity to dynamic Young’s modulus of sintered iron. Bayesian approach

• Published in: Materials today : proceedings 2022, Vol.59, p.1677-1682
• Main Authors: Dimitrov, Diayn M., Mincheva, Desislava, Slavov, Stoyan D.
• Format: Article
• Language: English
• Subjects: Bayesian inference; Sintered iron; Young’s modulus
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2022.03.399

•A Bayesian approach is used for parameter fit of model equation Er=1-P1-P/Pc for compact sintered from Fe powder.•The equation with proposed parameter value fits reasonably well the Young’s modulus of Fe-Cr-Mo prealloyed compacts.•The model fails for compacts produced by powder mixtures and diffusion alloyed powders with Cu addition. In this paper Young’s modulus against porosity relation E/Eo = f(P) for sintered Fe and steel powder compacts is discussed. For the experiment beam like (5 × 10 × 50 mm3) compacts, in density range 6.6–7.0 g/cm3 (P = 0.12–0.09), prepared from Fe powder (ASC100.29) are sintered in industrial conditions. Elastic constants E, G, ν are calculated from experimentally obtained fundamental mode shape frequencies, specimen mass and dimensions, using impulse excitation technique (IET). To ensure free beam boundary conditions, supports are placed in mode shapes nodal points. Popular model equation is fitted to experimental data. A Bayesian approach is used for parameter estimation. Fitted model equation predicts reasonably well the data from our and another researchers experiments with pre-alloyed Fe-Cr-Mo powder compacts, but fails for sintered steels prepared from powder mixtures and diffusion alloyed powders with Cu additions.