Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Calculation of Bulk and Shear Modulus by Analytical Methods of Quenched AISI 4140 Steel at Different Concentrations of PVP
Submission Author:
Eduardo da Rosa Vieira , RS
Co-Authors:
Eduardo da Rosa Vieira , Ignacio Iturrioz, Guilherme Schumacher
Presenter: Guilherme Schumacher
doi://10.26678/ABCM.COBEM2019.COB2019-1756
Abstract
Quenching is a heat treatment that aims at raising the hardness and mechanical resistance of the materials. This process transforms the austenite into martensite by a microstructural change without diffusion. For this to run, it is necessary that the material is heated above the austenitization temperature and rapidly cooled in a fluid. Currently, fluids that blend water with polymers are being used for this heat treatment. The polymer concentration in solution is critical for changing the heat removal capacity and hence the formation of martensite. The concentration of polymers in the solution is fundamental for the alteration of the heat withdrawal capacity and consequently the formation of martensite. Often, there is partial formation of martensite and the material develops one or more secondary phases, giving rise to an inhomogeneous material, which causes the properties of the materials to change. The analytical curves allow the calculation of the properties of inhomogeneous materials, from previously known characteristics of the matrix materials and second phase. In this work, samples of AISI 4140 steel were treated in different concentrations of polymer solution based on PVP. From the identification and quantification of its phases, its bulk and shear modules were calculated by five different methods. These calculations resulted in specific curves for each method, which were compared to each other.
Keywords
quenching, PVP, Bulk modulus, Shear Modulus
