Impact of the additive manufacturing process on the high-temperature corrosion of 316L steel in the presence of NaCl-KCl-ZnCl2 molten solar salt

被引:15
|
作者
Abu-warda, N. [1 ]
Garcia-Rodriguez, S. [1 ]
Torres, B. [1 ]
Utrilla, M., V [1 ]
Rams, J. [1 ]
机构
[1] Univ Rey Juan Carlos, Dept Matemat Aplicada Ciencia & Ingn Mat & Tecnol, ESCET, Tulipan S-N, Madrid 28933, Spain
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 20卷
关键词
316L stainless steel; Additive manufacturing; High-temperature corrosion; Chloride molten salt; Thermal energy storage; Concentrated solar plant; THERMAL-ENERGY STORAGE; STAINLESS-STEEL; ALLOYS;
D O I
10.1016/j.jmrt.2022.08.140
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A comparative study of the high-temperature oxidation and corrosion resistance of wrought and additive manufacturing selective laser melting (SLM) 316L stainless steel was performed in presence of molten NaCl-KCl-ZnCl2 salt used for thermal energy storage in the new generation of concentrated solar plants. Isothermal tests at 650 and 700 degrees C in a dry air atmosphere were conducted to evaluate (i) the effect of the manufacturing process and (ii) the effect of molten salts on the corrosion behavior of the steel by dimensional metrology analysis, scanning electron microscopy and X-ray diffraction characterization. The manufacturing process had a significant influence on the oxidation resistance. The wrought samples had a mass gain after 48 h that was four times greater than that of SLM samples at 650 degrees C, and 50% greater at 700 degrees C. The presence of the salt primarily increased the corrosion rate of all the samples and, again, the wrought pieces suffered 13% and 6% more corrosion in terms of metal loss than the SLM ones at 650 and 700 degrees C, respectively. The presence of more pathways for Cr diffusion associated with a higher number of defects in the microstructure of the SLM sample, as dislocations and grain boundaries, facilitated the formation of Cr2O3 scales in the SLM sample, avoiding the intergranular attack shown in the wrought one. (C) 2022 The Authors. Published by Elsevier B.V.
引用
收藏
页码:3949 / 3961
页数:13
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