Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/119311
Tipus de documentArticle
Data publicació2018-01-24
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
Metastable austenitic stainless steels, and in particular the TRansformation Induced Plasticity steels, rely on a phase transformation from a ductile austenite to a slightly harder martensite. These materials under fatigue testing conditions at the macrometric length scale can induce a softening or hardening effect as a function of the underlying deformation feature activated. Thus, given the interaction of single grains in polycrystalline materials, the collective response to macroscopic fatigue testing is not trivial to interpret. Within this context, small scale tests are required to obtain a more in detail understanding of the fatigue properties at the local level of those materials. In this regard, cyclic nanoindentation tests represent a suitable technique to give insight on the local fatigue of metastable stainless steels for a certain crystallographic orientation. In this experimental work, the influence of the testing mode (loading and/or displacement control mode) on the fatigue behavior of <111> austenitic grains as a function of their micromechanical properties as well as their deformation features was investigated in detail. It was found that the experiments done under loading control mode could be compared to conventional low cycle fatigue tests. In contrast when experiments were performed under displacement control mode they may be compared to high cycle fatigue tests. Furthermore, the microstructural observation by transmission electron microscopy allowed to observe the formation of shear bands. This phenomenon preceded the apparition of martensitic laths during the cyclic indentation process.
CitacióRoa, J.J., Sapezanskaia, I., Fargas, G., Kouitat, R., Redjaïmia, A., Mateo, A. Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels. "Materials science and engineering A. Structural materials properties microstructure and processing", 24 Gener 2018, vol. 713, p. 287-293.
ISSN0921-5093
Versió de l'editorhttps://www.sciencedirect.com/science/article/pii/S0921509317316404
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
pagination_MSA_35889.pdf | 2,075Mb | Visualitza/Obre |