Distribución y evolución de tensiones residuales en materiales compuestos de matriz metálica

Abstract

The aim of this work is to achieve, from an experimental standpoint, a deeper understanding of the way in which residual stress, generated by quenching, is distributed along the material and evolves with thermo-mechanical treatments. Also, the way in which the metallic matrix of a ceramic reinforced composite material accommodates thermal and mechanical mismatches induced by the presence of a reinforcing second phase. It will be taken into account as well, how factors such as alloy type, microstructure, type of reinforcement, or even manufacturing processes, may influence the distribution of residual stress. The presence of Residual Stress plays a paramount role in current design and fabrication of engineering components. Its generation by most of processing techniques, such as shaping, machining, welding, etc., has long been known. Finite element analysis models are usually capable of predicting useful macroscopic stress maps, but stress determination by traditional experimental techniques does not support these predictions accurately enough. The picture becomes more complex when microscopic residual stress, such as those arisen from the presence of second phases are involved. This is the case of Metal Matrix Composites. The aim of this work is to achieve, from an experimental standpoint, a deeper understanding of the way in which metallic matrix accommodates thermal and mechanical mismatches induced by the presence of a second phase, and how factors such as alloy type, microstructure, type of reinforcement, or even manufacturing processes, may influence the distribution of residual stress...