Intragranular cellular segregation network structure strengthening 316L stainless steel prepared by selective laser melting

被引：578
作者：
Zhong, Yuan [1 ]
Liu, Leifeng [1 ]
Wikman, Stefan [2 ]
Cui, Daqing [1 ]
Shen, Zhijian [1 ]
机构：
[1] Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, S-10691 Stockholm, Sweden
[2] Fus Energy, Torres Diagonal Litoral B3,Josep Pla 2, Barcelona 08019, Spain
来源：
JOURNAL OF NUCLEAR MATERIALS | 2016年 / 470卷
关键词：
ITER; Selective laser melting; 316L stainless steel; Mechanical property; Intragranular cellular structure; MECHANICAL-PROPERTIES; TECHNOLOGY; AUSTENITE; ALLOY;
D O I：
10.1016/j.jnucmat.2015.12.034
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A feasibility study was performed to fabricate ITER In-Vessel components by Selective Laser Melting (SLM) supported by Fusion for Energy (F4E). Almost fully dense 316L stainless steel (SS316L) components were prepared from gas-atomized powder and with optimized SLM processing parameters. Tensile tests and Charpy-V tests were carried out at 22 degrees C and 250 degrees C and the results showed that SLM SS316L fulfill the RCC-MR code. Microstructure characterization reveals the presence of hierarchical macro-, micro- and nano-structures in as-built samples that were very different from SS316L microstructures prepared by other established methods. The formation of a characteristic intragranular cellular segregation network microstructure appears to contribute to the increase of yield strength without losing ductility. Silicon oxide nano-inclusions were formed during the SLM process that generated a micro-hardness fluctuation in the building direction. The combined influence of a cellular microstructure and the nano-inclusions constraints the size of ductile dimples to nano-scale. The crack propagation is hindered by a pinning effect that improves the defect-tolerance of the SLM SS316L. This work proves that it was possible to manufacture SS316L with properties suitable for ITER First Wall panels. Further studies on irradiation properties of SLM SS316L and manufacturing of larger real-size components are needed. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：170 / 178
页数：9
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