TY - JOUR
T1 - Helium bubble nucleation in Laser Powder Bed Fusion processed 304L stainless steel
AU - Hou, Juan
AU - Dai, Binbin
AU - Li, Ying
AU - Zhao, Jianguang
AU - Chen, Zhuoer
AU - Pan, Dong
AU - Zhu, Yuman
AU - Zhang, Kai
AU - Huang, Aijun
PY - 2020/12/15
Y1 - 2020/12/15
N2 - The interest in application of Additive Manufacturing (AM) to nuclear industry stems not only from the benefits of design freedom and shortened lead time, but also from the possibility of enhancing the performance through microstructure control. One of the most important requirements for in-core structural material in nuclear power plants is helium resistance. The Laser Powder Bed Fusion (LPBF) processed 304L stainless steel possesses strong defect sinks such as high densities of dislocation-surrounded sub-grains and dispersed nano-inclusions. In this work the LPBF processed 304L in as-built and solution-annealed conditions along with a conventionally rolled counterpart were implanted with 350 keV He+ ion at 300 °C to 0.24 dpa (displacement per atom). Transmission Electron Microscopy (TEM) observations indicate significantly higher helium resistance of the as-built LPBF 304L compared to the other two samples. The sink strengths in the three samples are calculated based on the measurements of the microstructural features using simplified equations for the correlation between microstructural characteristics and helium tolerance. Based on the calculation, the cellular sub-grains and the dispersed nano-inclusions are the primary and secondary contributors to the helium resistance of LPBF 304L steel.
AB - The interest in application of Additive Manufacturing (AM) to nuclear industry stems not only from the benefits of design freedom and shortened lead time, but also from the possibility of enhancing the performance through microstructure control. One of the most important requirements for in-core structural material in nuclear power plants is helium resistance. The Laser Powder Bed Fusion (LPBF) processed 304L stainless steel possesses strong defect sinks such as high densities of dislocation-surrounded sub-grains and dispersed nano-inclusions. In this work the LPBF processed 304L in as-built and solution-annealed conditions along with a conventionally rolled counterpart were implanted with 350 keV He+ ion at 300 °C to 0.24 dpa (displacement per atom). Transmission Electron Microscopy (TEM) observations indicate significantly higher helium resistance of the as-built LPBF 304L compared to the other two samples. The sink strengths in the three samples are calculated based on the measurements of the microstructural features using simplified equations for the correlation between microstructural characteristics and helium tolerance. Based on the calculation, the cellular sub-grains and the dispersed nano-inclusions are the primary and secondary contributors to the helium resistance of LPBF 304L steel.
KW - Helium bubble nucleation
KW - Irradiation tolerance
KW - Laser Powder Bed Fusion
KW - Stainless steel
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85089679297&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2020.152443
DO - 10.1016/j.jnucmat.2020.152443
M3 - Article
AN - SCOPUS:85089679297
SN - 0022-3115
VL - 542
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
M1 - 152443
ER -