TY - JOUR
T1 - The effect of heat treatment on environment assisted cracking susceptibility of 9% Ni steel
AU - da Silva de Sa, Jonas
AU - da Silva Gama, Rafael
AU - Gomes, Jose Antonio da Cunha Ponciano
N1 - Publisher Copyright:
© 2020 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.
PY - 2021
Y1 - 2021
N2 - The influence of temper temperature on the environment assisted cracking of seamless 9% Ni steel tubes were investigated using scanning electron microscope (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), slow strain rate tensile (SSRT) tests, hydrogen permeation tests and electrochemical measurements. Mechanical and electrochemical tests were conducted in sodium thiosulphate (Na2S2O3 10−3 mol L−1) solution at open circuit potential (OCP) and at cathodic potential. Results showed that 9% Ni steel had a higher ductility loss at OCP when compared with the results obtained under cathodic potential. The lower ductility loss at cathodic potential was attributed to the inhibition of the anodic dissolution. After the tests, the specimens were examined using scanning electron microscopy to characterise the fracture morphology. The fracture surface exhibited mixed morphology, with a ductile morphology in the centre and a brittle morphology near the edges.
AB - The influence of temper temperature on the environment assisted cracking of seamless 9% Ni steel tubes were investigated using scanning electron microscope (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), slow strain rate tensile (SSRT) tests, hydrogen permeation tests and electrochemical measurements. Mechanical and electrochemical tests were conducted in sodium thiosulphate (Na2S2O3 10−3 mol L−1) solution at open circuit potential (OCP) and at cathodic potential. Results showed that 9% Ni steel had a higher ductility loss at OCP when compared with the results obtained under cathodic potential. The lower ductility loss at cathodic potential was attributed to the inhibition of the anodic dissolution. After the tests, the specimens were examined using scanning electron microscopy to characterise the fracture morphology. The fracture surface exhibited mixed morphology, with a ductile morphology in the centre and a brittle morphology near the edges.
KW - Steel
KW - hydrogen embrittlement
KW - hydrogen sulphide
KW - iron sulphide
KW - slow strain rate
UR - http://www.scopus.com/inward/record.url?scp=85094109215&partnerID=8YFLogxK
U2 - 10.1080/1478422X.2020.1836301
DO - 10.1080/1478422X.2020.1836301
M3 - Article
AN - SCOPUS:85094109215
SN - 1478-422X
VL - 56
SP - 179
EP - 188
JO - Corrosion Engineering Science and Technology
JF - Corrosion Engineering Science and Technology
IS - 2
ER -