Helium bubble nucleation in Laser Powder Bed Fusion processed 304L stainless steel
Artikel i vetenskaplig tidskrift, 2020

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.

Stainless steel

Irradiation tolerance

Laser Powder Bed Fusion

Helium bubble nucleation

Thermal stability


Juan Hou

University of Shanghai for Science and Technology

Binbin Dai

University of Shanghai for Science and Technology

Ying Li

University of Shanghai for Science and Technology

Jianguang Zhao

China Nuclear Power Engineering Co., Ltd.

Zhuoer Chen

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Dong Pan

Shanxi Taigang Stainless steel., Ltd.

Yuman Zhu

Monash University

Kai Zhang

Monash University

Aijun Huang

Monash University

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 542 152443


Oorganisk kemi


Atom- och molekylfysik och optik

Metallurgi och metalliska material






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