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首页> 外文期刊>Materials Science and Engineering >Additive manufacturing of 24CrNiMo low alloy steel by selective laser melting: Influence of volumetric energy density on densification, microstructure and hardness
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Additive manufacturing of 24CrNiMo low alloy steel by selective laser melting: Influence of volumetric energy density on densification, microstructure and hardness

机译：选择性激光熔化24crnimo低合金钢的添加剂制造：体积能密度对致密化，微观结构和硬度的影响

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摘要

24CrNiMo low alloy steels were fabricated by selective laser melting (SLM), aiming at investigating the effect of volumetric energy density (η) on the densification behavior and microstructural evolution, and then establishing a rational densification-microstructure-microhardness relationship of as-built samples. The results showed that the densification level of the as-built samples was significantly improved with increasing the η, due to the inhibition of balling effects and internal pores. As-built samples mainly exhibited ix-Fe (M) and Fe_3C, and the diffraction angles of the main phase α-Fe (M) peaks slightly shifted to the left in comparison with their standard locations due to the lattice distortion. The microstructure of the as-built samples mainly composed of high-containing martensite (M) and low-containing lower bainite (LB), resulting from the rapid solidification and the heat accumulation. As the η increased, the size and number of LB gradually increased owing to the relatively decrease of cooling rate. EBSD maps depicted that the grain size of the as-built samples increased with the increase of η. The microhardness of the as-built samples exhibited an upward trend with the η increasing, implying that compared to the grain size, the internal defects played a dominant role in determining the hardness. The solid solution strengthening, dislocation strengthening and precipitate strengthening resulting from M/LB duplex microstructure resulted in the achieved high hardness, under the premise of ensuring relative density.
机译：通过选择性激光熔化（SLM）制造24crnimo低合金钢，旨在研究体积能密度（η）对致密化行为和微观结构演化的影响，然后建立原木样品的理性致密化微观结构 - 微硬度关系。结果表明，由于抑制了球形效应和内部孔，增加了η的抗置样品的致密化水平随着η增加而显着改善。由于晶格变形，所构型样品主要表现出IX-Fe（M）和Fe_3C，并且主阶段α-Fe（M）峰的衍射角略微移位到左侧。由高含马氏体（M）和低含有低贝氏体（LB）组成的竣工样品的微观结构，由快速凝固和热量积聚产生。由于η增加，由于冷却速率的相对降低，LB的尺寸和数量逐渐增加。所描绘的EBSD地图描绘了由于η的增加而增加的原木样品的粒度增加。由于η的增加，所构型样品的显微压性表现出向上趋势，暗示与晶粒尺寸相比，内部缺陷在确定硬度方面发挥了显着作用。由M / LB双工微观结构产生的固体溶液强化，脱位强化和沉淀强化导致达到高硬度，在确保相对密度的前提下。

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  • 来源
    《Materials Science and Engineering》 |2021年第30期|140957.1-140957.11|共11页
  • 作者

    X. Cui; S. Zhang; C.H. Zhang; J. Chen; J.B. Zhang; S.Y. Dong;

  • 作者单位

    School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 Liaoning PR China;

    School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 Liaoning PR China;

    School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 Liaoning PR China;

    Shenyang Dalu Laser Technology CO. LTD Shenyang 110136 Liaoning PR China;

    Shenyang Dalu Laser Technology CO. LTD Shenyang 110136 Liaoning PR China;

    National Key Laboratory for Remanufacturing Army Academy of Armored Forces Beijing 100072 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; 24CrNiMo low alloy steel; Densification; Microstructure; Hardness;

    机译：选择性激光熔化;24crnimo低合金钢;致密化;微观结构;硬度;

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