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Microstructure evolution of 24CrNiMoY alloy steel parts by high power selective laser melting

机译：高功率选择性激光熔解24CrNiMoY合金钢零件的组织演变

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摘要

24CrNiMoY alloy steel used for brake disc was prepared by high power selective laser melting (HP-SLM) in order to increase the productivity. In this work, the microstructure and mechanical properties of as-fabricated part were characterized. Effects of the location of as-fabricated 24CrNiMoY part (top, middle and bottom) and scanning speed on microstructure evolution were studied. The results of this work indicated that the as-fabricated part microstructure mainly consisted of granular bainite and lath bainite. Demonstrating that bainite was obtained by a large temperature gradient and sufficient holding time by experiment. With increasing scanning speed, the size d(B) of the bainitic ferrite lath beam spacing and the size empty set(B) of the mixed structure of polygonal ferrite and quasi-polygonal ferrite were gradually refined and larger, respectively. The HP-SLM-produced parts were dominated by high-angle ( 15 degrees) grain boundaries (HAGBs) and the contents of HAGBs decreased at first while increased (62.3%, 63.5%, 50.1%) when scanning speed varied from 5 to 9mm/s. Supersaturated solid solution, dislocation, and subgrain cell structure, which results in a high microhardness and fine strength.
机译：为了提高生产率，通过高功率选择性激光熔化（HP-SLM）制备了用于制动盘的24CrNiMoY合金钢。在这项工作中，表征了所制造零件的显微组织和力学性能。研究了加工后的24CrNiMoY零件的位置（顶部，中间和底部）和扫描速度对显微组织演变的影响。这项工作的结果表明，加工后的零件的显微组织主要由粒状贝氏体和板条贝氏体组成。通过实验证明通过大的温度梯度和足够的保持时间获得贝氏体。随着扫描速度的提高，贝氏体铁素体板条梁间距的大小d（B）和多边形铁素体与准多边形铁素体的混合结构的空洞集（B）分别逐渐变细和变大。 HP-SLM生产的零件以高角度（> 15度）晶界（HAGBs）为主，并且当扫描速度从5变为5时，HAGBs的含量先降低而后增加（62.3％，63.5％，50.1％）。 9毫米/秒过饱和固溶体，位错和亚晶胞结构，导致较高的显微硬度和优良的强度。

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  • 来源
    《Journal of Manufacturing Processes》 |2019年第8期|28-37|共10页
  • 作者

    Zuo Panfei; Chen Suiyuan; Wei Mingwei; Zhou Lin; Liang Jing; Liu Changsheng; Wang Mei;

  • 作者单位

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Key Lab Laser Applicat Technol & Equipment Liaoni, Sch Mat & Engn,Minist Educ, Shenyang 110819, Liaoning, Peoples R China;

    Shenyang Dalu Laser Technol Co Ltd, Shenyang, Liaoning, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    High power selective laser melting; 24CrNiMoYalloy steel; Microstructure evolution and mechanical properties;

    机译：高功率选择性激光熔化;24crnimoyalloy钢;微观结构演化与机械性能;

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