Caracterização e resistência à corrosão da liga inoxidável Fe-Mn-Si-Cr-Ni com efeito memória de forma

Abstract

Alloys with shape memory effect can recover its original shape after being deformed plastically, by a specific heat treatment. It´s really worthwhile to explore this feature because it allows the fabrication of joints and pipe coupling joints without the use of welds. The alloys Fe-Mn-Si-Cr-Ni that have this property are potential candidates for this application and has attracted the attention of researchers to be an economical alternative and easy production compared to shape memory alloys with based copper or nickel-titanium. In the present study, were characterized the microstructure, microhardness and phase transformations as temperature´s function of a stainless steel Fe-Mn-Si-Cr-Ni system with memory effect in two different conditions of thermomechanical process by scrapping starting from more conventional routes to decrease value of the final product and enable production. The melting of the alloy ingot generated a high level of inclusions, porosity and precipitated secondary phases. The alloy were studied in homogenized and hot rolled conditions. The hot rolled condition presented the best results, with a refined microstructure. The homogenizing heat treatment removed some secondary phases and also increased the austenitic grain. The temperatures of phase transformations hadn´t significant variation in the diferents conditions studieds. The alloy didn´t show a good pitting corrosion resistance in chloride environments.