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Thermodynamics analysis and rapid solidification of laser polished Inconel 718 by selective laser melting

机译：Inconel 718激光抛光的热力学分析和通过选择性激光熔化的快速凝固

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摘要

This paper presents thermodynamics analysis and rapid solidification of laser polishing technology for selective laser melting (SLM) Inconel 718 superalloy. Significant porosity reduction has been examined in the laser polished layer, where the surface porosity is reduced by 65.7% compared with that of the as-fabricated SLM surface. The results show that the temperature in the polished zone is over 1683 K, and the cooling rate is approximately up to 2.46 x 10(6) K/s. Besides, the polished layer consists of equiaxed grain and columnar grain with average grain size of 10 +/- 2.4 mu m and 5 +/- 1.2 mu m, respectively, and tiny cell grains with average size of 3.5 mu m in the heat-affected zone (HAZ). Moreover, the transmission electron microscope (TEM) results show that the orientation relationship (OR) between the gamma matrix and Laves phase is found to be Burgers OR [0 1 1](gamma) parallel to [0 1 (1) over bar 2](Laves) on the as-received layer and [(1) over bar 1 1](gamma) parallel to [1 (2) over bar 1 (3) over bar](Laves) son the polished layer.
机译：本文介绍了用于选择性激光熔化（SLM）Inconel 718高温合金的激光抛光技术的热力学分析和快速固化。在激光抛光层中已经检查出显着的孔隙率降低，与加工后的SLM表面相比，表面孔隙率降低了65.7％。结果表明，抛光区的温度超过1683 K，冷却速率大约为2.46 x 10（6）K / s。此外，抛光层由等轴晶粒和圆柱状晶粒组成，平均晶粒尺寸分别为10 +/- 2.4微米和5 +/- 1.2微米，在加热过程中平均晶粒尺寸为3.5微米。受影响的区域（HAZ）。此外，透射电子显微镜（TEM）结果表明，γ矩阵与Laves相之间的取向关系（OR）为Burgers OR [0 1 1]γ与bar 2上的[0 1（1）平行接收层上的[]（Laves），并在抛光层上与[（1）在条1 1上的] [γ]平行于[1（2）在条1（3）上的条]（Laves）。

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  • 来源
    《Applied Surface Science》 |2020年第1期|145423.1-145423.7|共7页
  • 作者

    Li Yuhang; Zhang Zhen; Guan Yingchun;

  • 作者单位

    Beihang Univ Sch Mech Engn & Automat 37 Xueyuan Rd Beijing 100083 Peoples R China;

    Tsinghua Univ State Key Lab Tribol Dept Mech Engn Beijing 100084 Peoples R China|Tsinghua Univ Inst Mfg Engn Dept Mech Engn Beijing 100084 Peoples R China|Tsinghua Univ Beijing Key Lab Precis Ultraprecis Mfg Equipments Beijing 100084 Peoples R China;

    Beihang Univ Sch Mech Engn & Automat 37 Xueyuan Rd Beijing 100083 Peoples R China|Beihang Univ Natl Engn Lab Addit Mfg Large Metall Components 37 Xueyuan Rd Beijing 100083 Peoples R China|Beihang Univ Int Res Inst Multidisciplinary Sci 37 Xueyuan Rd Beijing 100083 Peoples R China|Beihang Univ Hefei Innovat Res Inst Xinzhan Hi Tech Dist 230013 Anhui Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Laser polishing; Inconel 718 superalloy; Selective laser melting; Microstructural evolution; Crystallographic orientation;

    机译：激光抛光;Inconel 718高温合金;选择性激光熔化;微观结构演变;晶体取向;

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