Helium bubble nucleation in Laser Powder Bed Fusion processed 304L stainless steel

JOURNAL OF NUCLEAR MATERIALS

卷:542

Article

Hou, Juan¹  Dai, Binbin¹  Li, Ying¹  Zhao, Jianguang²  Chen, Zhuoer^3,4  Pan, Dong⁵  Zhu, Yuman⁴  Zhang, Kai^1,4  Huang, Aijun⁴ 

[1] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China

[2] China Nucl Power Engn Co Ltd, Shenzhen 518124, Peoples R China

[3] Chalmers Univ Technol, Dept Ind & Mat Sci, S-41326 Gothenburg, Sweden

[4] Monash Univ, Monash Ctr Addit Mfg MCAM, Notting Hill, Vic 3168, Australia

[5] Shanxi Taigang Stainless Steel Co Ltd, Technol Ctr, Taiyuan 030003, Peoples R China

关键词: Laser Powder Bed Fusion;    Stainless steel;    Helium bubble nucleation;    Thermal stability;    Irradiation tolerance;   

DOI  :  10.1016/j.jnucmat.2020.152443

来源: Elsevier

【 摘 要 】

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 subgrains and dispersed nano-inclusions. In this work the LPBF processed 304L in as-built and solutionannealed conditions along with a conventionally rolled counterpart were implanted with 350 keV He+ ion at 300 degrees 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. (C) 2020 The Authors. Published by Elsevier B.V.

【 授权许可】

Free