Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Mechanical Properties in Function of Strain Rate of AISI 304 Austenitic Stainless Steels: A Comparative Study at Room and Cryogenic Temperatures
Submission Author:
Maxwell Azevedo , PR
Co-Authors:
Maxwell Azevedo, Marcel Tadashi Izumi, Maicon Crivoi, Ricardo Sanson Namur, Osvaldo Cintho
Presenter: Maxwell Azevedo
doi://10.26678/ABCM.COBEM2017.COB17-1381
Abstract
:Remarkable mechanical behaviors are observed in austenitic stainless steel AISI 304 when subject to deformation at cryogenic temperatures (CT approx. -180 ºC) compared to room temperature (RT approx. 25 ºC). In this research, specimens of AISI 304 austenitic stainless steel were subjected to tensile test at RT and CT, at different strain rates of 1.2×10-3 s-1; 2.4×10-4 s-1; 6×10-5 s-1 in order to identify the provable combination between strain rate and temperature to improve ultimate tensile strength (UTS) and elongation. It is known that higher strain rates and lower temperatures induce a decrease of Stacking Fault Energy (SFE) and a suppression of dynamic recovery. This effect induces the change of deformation mechanisms, which can be twinning over slip. In addition, the microstructure and fracture surfaces were analyzed by optical microscopy and scanning electron microscopy with Field Emission Gun (SEM-FEG). The fractographic analysis showed several morphology, which can help to explain the microstructural evolution. It was investigated the connection between strain rate with mechanical properties and fracture morphology, at RT and CT.
Keywords
Cryogenic deformation, austenitic stainless steel, Strain rate, Martensitic transformation, Fractography
