Study of Helium Bubbles Growth and Hardening of Selective Laser Melting 304L Stainless Steel Under He+ Irradiation
HOU Juan1,2,*, LIU Hui2, CHEN Liang1, MIN Shiling2, JIANG Menglei2
1 State Key Laboratory of Nuclear Power Safety Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, Guangdong, China 2 School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract: The as-built and solution-annealed selective laser melting 304L stainless steel (SLM 304L SS) were implanted with 350 keV He+ at 300 ℃ to fluxes of 5×1016 ions/cm2 and then annealed at 600 ℃ for 1 h. The helium bubble growth and irradiation hardening in SLM 304L SS were investigated by TEM, positron annihilation, and nanoindentation measurements. Compared those between two variants of SLM 304L SS, one in as-built condition and the other solution-annealed, the results indicates that the as-built sample of the SLM 304L SS exhibited the outstanding resistance to helium bubble growth in the post-irradiation annealed at 600 ℃. Because abundant defect sinks, including high dislocation densities and interfaces between nano-inclusions and the matrix, can effectively inhibit the helium bubble coarsening. Additionally, the hardening rate of the as-built sample is 19% whereas that of the solution-annealed sample is 51% after annealing. According to the calculation of Orowan model, the difference of helium bubble coarsening is the main reason for the different hardening rate of SLM 304L stainless steel in two states.
通讯作者:
*侯娟,上海理工大学增材制造研究院副教授、硕士研究生导师。2005年合肥工业大学本科毕业,2010年于中国科学院金属研究所获博士学位,期间(2008—2009年)在日本东北大学进行联合培养。目前主要从事金属增材制造研究,包括不锈钢、铝合金、高温合金等多种金属材料的打印工艺开发、材料性能分析、后处理制度以及相关检验标准与方法的制定。主持国家自然科学基金青年和面上项目,牵头中广核、中国商飞、商发等多项企业研究项目,在Corrosion Science、Journal of Materials Science and Technology、Journal of Nuclear Materials等国外SCI期刊以第一/通信作者发表论文30余篇。hou18217727686@163.com
引用本文:
侯娟, 刘慧, 陈亮, 闵师领, 蒋梦蕾. 选区激光熔化成形304L不锈钢氦泡长大与辐照硬化行为[J]. 材料导报, 2024, 38(2): 22050298-6.
HOU Juan, LIU Hui, CHEN Liang, MIN Shiling, JIANG Menglei. Study of Helium Bubbles Growth and Hardening of Selective Laser Melting 304L Stainless Steel Under He+ Irradiation. Materials Reports, 2024, 38(2): 22050298-6.
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2024, Vol. 38 
