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Hardening behavior of selective laser melted 304L stainless steel under Xe irradiation
Vacuum ( IF 4 ) Pub Date : 2021-07-13 , DOI: 10.1016/j.vacuum.2021.110453
Ying Li 1, 2 , Jianjian Li 1 , Chonglong Fu 1, 3 , Juju Bai 1, 3 , Juan Hou 2 , Jun Lin 1 , Zhimin Dai 1
Affiliation  

The irradiation damage behavior was studied in the Selective laser melted (SLM) 304L stainless steel irradiated by 5 MeV Xe ions at room temperature. The changes in the hardness and microstructure were characterized to explore the irradiation resistance of the SLM 304L stainless steel with traditionally manufactured (TM) 304L stainless steel as the reference material. The nanohardness results demonstrated that both investigated alloys exhibit irradiation hardening phenomena, with a lower hardening degree for irradiated SLM 304L stainless steel. At the ion dose of 10 dpa, the hardening degrees of the SLM and TM 304L stainless steel were 37% and 76%, respectively. Further the TEM results revealed the lower density and smaller dislocation loops appeared in SLM 304L stainless steel, which was caused by the unique dislocation wall at the sub-grain boundary, nano-inclusions, and fine grain structure. The calculated result based on the dispersed barrier hardening model revealed that the dislocation loop induced by irradiation was the dominant factor for the hardening of the materials.



中文翻译:

选择性激光熔化304L不锈钢在氙辐照下的硬化行为

在室温下用 5 MeV Xe 离子辐照的选择性激光熔化 (SLM) 304L 不锈钢中研究了辐照损伤行为。以传统制造的 (TM) 304L 不锈钢为参考材料,对硬度和微观结构的变化进行表征,以探索 SLM 304L 不锈钢的耐辐照性。纳米硬度结果表明,两种研究的合金都表现出辐照硬化现象,辐照 SLM 304L 不锈钢的硬化程度较低。在离子剂量为 10 dpa 时,SLM 和 TM 304L 不锈钢的硬化度分别为 37% 和 76%。此外,TEM 结果显示 SLM 304L 不锈钢中出现较低的密度和较小的位错环,这是由亚晶界处独特的位错壁、纳米夹杂物和细晶粒结构引起的。基于分散势垒硬化模型的计算结果表明,辐照引起的位错环是材料硬化的主导因素。

更新日期:2021-07-14
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