Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
COMPARATIVE STUDY OF RESIDUAL STRESSES IN GRINDING OF P91 STEEL BY X-RAYS DIFFRACTION AND MAGNETIC BARKHAUSEN NOISE TECHNIQUES
Submission Author:
Maria Cindra Fonseca , RJ , Brazil
Co-Authors:
Maria Cindra Fonseca, Gabriele Magalhães de Paula, Leosdan Figueredo Noris, Matheus Muntzberg, Bernardo Moniz de Aragão, Bruna Machado
Presenter: Bruna Machado
doi://10.26678/ABCM.COBEM2019.COB2019-2154
Abstract
The grinding process present a critical importance for metal-mechanic industries, once it is a finishing machining process. The Cr-Mo steel ASTM P91 is a distinguished material used in the energy production industry, specially in power plants. Although there are many studies on the mechanical behavior of these steels, their application in machining processes is still poorly studied. Since residual stresses are intrinsic to all manufacturing processes, it is important to know the nature of these stresses, in order to avoid a premature and unexpected fracture, mainly if they are tensile stresses, which are deleterious for the fatigue life of the component. On another hand, it is well established that compressive residual stresses increase the fatigue life and corrosion resistance of the material. Therefore, to find alternative measurement techniques that offer possibilities in quantification and qualification of residual stresses is crucial. In the present work analysis of residual stresses in P91 steel samples were carried out with two different techniques: X-ray diffraction and magnetic Barkhausen noise. The results show that magnetic Barkhausen noise (MBN) values are coherent with the residual stresses measured with X-ray diffraction.
Keywords
Residual stresses, P91 steel, X-ray Diffraction, magnetic Barkhausen noise technique
