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首页> 外文期刊>Materials Science and Engineering >Selective laser melting of austenitic oxide dispersion strengthened steel: Processing, microstructural evolution and strengthening mechanisms
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Selective laser melting of austenitic oxide dispersion strengthened steel: Processing, microstructural evolution and strengthening mechanisms

机译：奥氏体氧化物分散的选择性激光熔化强化钢：加工，微观结构演化和强化机制

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摘要

Oxide dispersion strengthened (ODS) alloys exhibit superior mechanical properties due to the presence of nano-sized thermally stable oxide particles. However, manufacturing of ODS alloys is very complex and composed of numerous time consuming steps such as mechanical alloying, which is one of the main barriers toward the widespread application of ODS alloys. Light mixing of 304L stainless steel powder with sub-micrometer size yttria particles was coupled with selective laser melting (SLM) to produce 304L ODS nanocomposite. The added yttria was dissolved in the matrix due to the high intensity of the laser and altered the Theological properties of the melt and caused balling effect. The SLM 304L ODS alloy presented cellular substructure with a uniform dispersion of yttrium silicate (Y-Si-O) spherical nanoparticles, range 10-80 nm. As a result, the SLM 304L ODS alloy showed a high ultimate tensile strength of -700 MPa, ductility of ～32% and microhardness of ～350 HV. The underlying mechanism for this strength and ductility improvement are identified. This study provides deep insight into an alternative method of producing ODS alloys with fewer steps and capable of manufacturing complex design geometries.
机译：增强的氧化物分散体（ODS）合金由于存在纳米尺寸的热稳定氧化物颗粒而具有优异的机械性能。然而，ODS合金的制造非常复杂，并且由许多耗时的步骤（如机械合金化）组成，这是对ODS合金广泛应用的主要障碍之一。用亚微米尺寸yttra颗粒的304L不锈钢粉末的光混合与选择性激光熔化（SLM）相结合，以产生304L次ODS纳米复合材料。由于激光的高强度，并改变了熔体的神学性质并引起了球形作用，将添加的ytTRIA溶解在基质中。 SLM 304L ODS合金具有均匀分散的硅酸盐（Y-Si-O）球形纳米颗粒，范围为10-80nm的蜂窝亚结构。结果，SLM 304L ODS合金显示出高的极限拉伸强度-700MPa，延性〜32％，微硬度为350HV。确定了这种强度和延展性改善的潜在机制。本研究提供了深入了解制备缺陷合金的替代方法，较少的步骤，能够制造复杂的设计几何形状。

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  • 来源
    《Materials Science and Engineering》 |2020年第24期|139532.1-139532.12|共12页
  • 作者

    Milad Ghayoor; Kijoon Lee; Yujuan He; Chih-hung Chang; Brian K. Paul; Somayeh Pasebani;

  • 作者单位

    School of Mechanical Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97330 USA Advanced Technology and Manufacturing Institute (ATAMI) Corvallis OK 97330 USA;

    School of Mechanical Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97330 USA Advanced Technology and Manufacturing Institute (ATAMI) Corvallis OK 97330 USA;

    School of Chemical Biological and Environmental Engineering Oregon State University Corvallis OR 97330 USA;

    School of Chemical Biological and Environmental Engineering Oregon State University Corvallis OR 97330 USA;

    School of Mechanical Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97330 USA Advanced Technology and Manufacturing Institute (ATAMI) Corvallis OK 97330 USA;

    School of Mechanical Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97330 USA Advanced Technology and Manufacturing Institute (ATAMI) Corvallis OK 97330 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Selective laser melting; Nanocomposite; Oxide dispersion strengthened alloy; 304L stainless Steel;

    机译：选择性激光熔化;纳米复合材料;氧化物分散体强化合金;304L不锈钢;

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