Helium Bubble Growth in He^(+) Ions Implanted 304L Stainless Steel Processed by Laser Powder Bed Fusion During Post-Irradiation Annealing at 600℃  

作　　者：Hui Liu Shiling Min Menglei Jiang Fuzhong Chu Ying Li Zhuoer Chen Kai Zhang Juan Hou Aijun Huang 

机构地区：[1]School of Materials Science and Chemistry,University of Shanghai for Science and Technology,Shanghai,200093,China [2]Department of Industrial and Materials Science,Chalmers University of Technology,41326,Gothenburg,Sweden [3]Monash Centre for Additive Manufacturing(MCAM),Monash University,Notting Hill,VIC,3168,Australia [4]State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Engineering Co.,Ltd.,Shenzhen,518172,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第9期1509-1518,共10页金属学报（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(Grant No.52073176)。

摘　　要：The abundancy of defect sinks in the microstructure of laser powder bed fusion(LPBF) processed austenitic stainless steels was found to be beneficial for helium resistance.In the current study,the influence of the novel microstructure in LPBF processed 304 L on the helium bubble growth behaviour was investigated using transmission electron microscopy in samples implanted with He^(+) ion and post-irradiation annealing treated at 600℃ for 1 h.Two variants of LPBF processed 304 L samples were used,one in as-built condition and the other solution-annealed.The comparison between the two samples indicated that the helium bubble growth was inhibited and remained stable in the as-built sample but coarsened significantly in the solution-annealed sample.The sub-grain boundaries and oxide nano-inclusions acted as defect sinks to trap helium atoms and inhibited the growth of helium bubble in the as-built sample under the post-irradiation annealing conditions used.

关 键 词：Laser powder bed fusion Stainless steel Helium bubble growth Irradiation tolerance Nano oxide inclusions 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TP391.73[金属学及工艺—金属材料]