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Enhanced thermal stability of the cellular structure through nano-scale oxide precipitation in 3D printed 316L stainless steel
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2021-01-05 , DOI: 10.1016/j.fusengdes.2020.112213
Xu Zhang , Haibo Cao , Xinyi Yang , Yanyun Zhao , Huijuan Wang , Xiaodong Mao , Yutao Zhai

The cellular structure is one of the reasons for the improvement of 316 L performance which fabricated by additive manufacturing technology. However, the cellular structure tends to disappear at high temperatures. In this study, oxide nanoparticles were introduced into the 316 L matrix to improve the thermal stability of the cellular structure, this material was successfully fabricated by mechanical alloying followed with laser-powder-bed-fusion (LPBF). The thermal stability of the cellular structure in 316 L was tested with isothermal heat treatment at 1073 K, 1173 K and 1273 K, respectively. The microstructural stability of the cellular was characterized with scanning electron microscopy, transmission electron microscopy (TEM), electron backscatter diffraction, X-ray diffraction measurements and Vickers microhardness testing. The cellular structure was stable at 1073 K due to the dispersed precipitates pining the dislocations at its boundary. The chemical composition of the oxide precipitates with sizes in the range of 10–200 nm was examined by TEM combined with an energy dispersive spectrometry. This work provided a method to enhance the thermal stability of the microstructure of the additively manufactured stainless steel 316 L.



中文翻译:

通过在3D打印的316L不锈钢中形成纳米级氧化物沉淀来增强蜂窝结构的热稳定性

蜂窝状结构是通过增材制造技术制造的改善316 L性能的原因之一。然而,细胞结构在高温下趋于消失。在这项研究中,将氧化物纳米颗粒引入到316 L基质中以改善细胞结构的热稳定性,该材料是通过机械合金化以及激光粉末床熔融(LPBF)成功制造的。用等温热处理分别在1073 K,1173 K和1273 K下测试了316 L中孔结构的热稳定性。用扫描电子显微镜,透射电子显微镜(TEM),电子反向散射衍射,X射线衍射测量和维氏显微硬度测试来表征细胞的微结构稳定性。由于分散的沉淀物使位错钉扎在其边界处,因此细胞结构在1073 K处稳定。透射电镜结合能量色散光谱法检查了尺寸为10-200 nm的氧化物沉淀物的化学成分。这项工作提供了一种方法,以提高增材制造的316 L不锈钢微观组织的热稳定性。

更新日期:2021-01-05
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