Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Exploratory evaluation of the T0 reference temperature for a high strength martensitic steel using the master curve approach
Submission Author:
Vitor Scarabeli Barbosa , RJ
Co-Authors:
Vinicius Mota da Cruz Gomes, Vitor Scarabeli Barbosa, Claudio Ruggieri
Presenter: Vitor Scarabeli Barbosa
doi://10.26678/ABCM.COBEM2021.COB2021-0608
Abstract
The Master Curve approach and ASTM E1921 standard represent a significant advancement in defining a reference temperature, T0, and associated median fracture toughness values for ferritic steels with a yield strength in the range of 275 MPa - 825 MPa. The method has been successfully applied to describe the dependence of fracture toughness with temperature for the tested material in the DBT region for a wide range of pressure vessel steels, irradiated steels and several other structural steels. However, there is very limited work that supports the applicability of the methodology and, further the accuracy of T_{0} estimates for high strength martensitic steels (usually above 1000 MPa of yield stress) employed in structural and wear applications involving harsh environments working. This work addresses an experimental investigation of the brittle fracture behavior for a high strength martensitic steel using conventional 3P SE(B) specimens. The purpose of this work is to assess the applicability of the Master Curve methodology in providing a reliable estimate of the reference temperature (T0) derived from fracture toughness data sets measured in the ductile-to-brittle transition region (DBT) of a direct-quenched low alloy martensitic steel. Fracture toughness tests conducted at different temperatures in the DBT region provide the fracture toughness data in terms of the J-integral at instability point, Jc. The measured distributions of fracture toughness values showed a relatively smaller scatter compared to the theoretical scatter specified by ASTM E1921 standard and provided mean curves of fracture toughness vs. temperature that slightly deviate from the theoretical master curve. Even though the toughness-temperature behavior and scatter were shown to deviate from the ASTM E1921 predictions, the use of Master Curve in its standard formulation still provides a good description of the fracture toughness dependence with temperature for the tested material.
Keywords
master curve, reference temperature, fracture toughness, ductile-to-brittle transition temperature, direct-quenched martensitic steel
