Estudio de la austenita retenida en el acero inoxidable bajo condiciones experimentales de soldadura y tratamientos térmicos.

Abstract

The main objective of this research is to carry out the study of retained austenite in stainless steel under experimental welding conditions and technical treatments. The microstructural procedure of steels has been studied: A743 CA6-NM and AISI 304L. In each case study, each metallographic and microhardness test was analyzed with the purpose of carrying out an adequate data collection to have a safe and reliable source in which the Quality Control Turbines and Parts Research and Recovery Center Industrialists have reference in future fields of repairing hydraulic elements. The results indicate that the case study that presents better effects in terms of homogenization of the microstructure, dispersion of retained austenite and microhardness in ASTM A743 CA6-NM steel is M-CE12, however, in terms of impact tests the cases of study that better results presents in terms of absorption energy is the M-CE15, having this as an excellent alternative in terms of repairs of blades and other hydraulic elements of this type of dissimilar welding. As for AISI 304L steel, it was observed that they cannot improve their mechanical properties though heat tr0eatments, presenting problems such as intergranular corrosion degrading the material. Through the impact test, it was concluded that the austenitic microstructure has better characteristics in terms of impact resistance, however, in the A743 CA6-NM steel with a very small dispersion of retained austenite occurs, this steel does not achieve a higher degree of tenacity or ductility, it is recommended to evaluate the material with several cases of repair since in this research was done with a material without any type of repair.