TY - JOUR
T1 - Enhanced Resistance to Irradiation Induced Ferritic Transformation in Nanostructured Austenitic Steels
AU - Wu, Yaqiao
AU - Hoffman, Andrew
AU - Arivu, Maalavan
AU - Wen, Haiming
AU - He, Li
AU - Sridharan, Kumar
AU - Wang, Xin
AU - Xiong, Wei
AU - Liu, Xiang
AU - He, Lingfeng
N1 - Hoffman, Andrew; Arivu, Maalavan; Wen, Haiming; He, Li; Sridharan, Kumar; Wang, Xin; . . . and Wu, Yaqiao. (2020). "Enhanced Resistance to Irradiation Induced Ferritic Transformation in Nanostructured Austenitic Steels". Materialia, 13, 100806-1 - 100806-12. https://doi.org/10.1016/j.mtla.2020.100806
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Irradiation induced phase transformation of γ -austenite to α -ferrite has been observed in austenitic steels for the past several decades. This transformation can be detrimental to structural materials in a nuclear reactor environment as the increased fraction of the ferritic phase can increase corrosion and embrittlement and lead to stress corrosion cracking. This transformation is caused by both strain induced martensite transformation as well as radiation induced segregation and precipitation. In this study, two radiation tolerant nanostructured 304L austenitic steels (one ultrafine grained and one nanocrystalline) were manufactured using severe plastic deformation. These nanostructured 304L steels were compared to conventional coarse-grained 304L, after self-ion irradiation at 500°C up to a peak damage of 50 displacements per atom. Phase fraction after irradiation was analyzed using grazing incidence x-ray diffraction, precession electron diffraction, and electron backscatter diffraction. Nanostructured 304L steels showed significant resistance to irradiation induced austenite to ferrite transformation. This resistance was shown to be due to a decrease in defect formation, as well as a reduction in radiation induced segregation and precipitation.
AB - Irradiation induced phase transformation of γ -austenite to α -ferrite has been observed in austenitic steels for the past several decades. This transformation can be detrimental to structural materials in a nuclear reactor environment as the increased fraction of the ferritic phase can increase corrosion and embrittlement and lead to stress corrosion cracking. This transformation is caused by both strain induced martensite transformation as well as radiation induced segregation and precipitation. In this study, two radiation tolerant nanostructured 304L austenitic steels (one ultrafine grained and one nanocrystalline) were manufactured using severe plastic deformation. These nanostructured 304L steels were compared to conventional coarse-grained 304L, after self-ion irradiation at 500°C up to a peak damage of 50 displacements per atom. Phase fraction after irradiation was analyzed using grazing incidence x-ray diffraction, precession electron diffraction, and electron backscatter diffraction. Nanostructured 304L steels showed significant resistance to irradiation induced austenite to ferrite transformation. This resistance was shown to be due to a decrease in defect formation, as well as a reduction in radiation induced segregation and precipitation.
KW - austenitic steels
KW - irradiation induced phase transformation
KW - irradiation induced precipitation
KW - irradiation induced segregation
KW - nanostructured materials
KW - severe plastic deformation
UR - https://scholarworks.boisestate.edu/mse_facpubs/441
UR - https://doi.org/10.1016/j.mtla.2020.100806
UR - http://www.scopus.com/inward/record.url?scp=85088894329&partnerID=8YFLogxK
U2 - 10.1016/j.mtla.2020.100806
DO - 10.1016/j.mtla.2020.100806
M3 - Article
VL - 13
JO - Materialia
JF - Materialia
M1 - 100806
ER -