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首页> 外文期刊>Materials Science and Engineering >The evolution of bainite and mechanical properties of direct laser deposition 12CrNi2 alloy steel at different laser power
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The evolution of bainite and mechanical properties of direct laser deposition 12CrNi2 alloy steel at different laser power

机译：不同激光功率下直接沉积12CrNi2合金钢的贝氏体演变及力学性能

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摘要

In this paper, 12CrNi2 alloy steel samples were successfully fabricated by direct laser deposition (DLD) technology. The evolution of bainite in the DLD 12CrNi2 alloy steel process at different laser power of 1800 W, 2000 W and 2200 W and mechanical properties of as-deposited samples were investigated. The results showed that the middle-upper microstructure of the samples fabricated at different laser power transformed from lath bainite (LB) to granular bainite (GB) with increasing laser power. In addition, granular bainite was divided into blocky granular bainite (GB1) and lath-like granular bainite (GB2) according to different formation mechanisms, and the amount of GB1 increased and GB2 decreased in the range of laser power from 2000 W to 2200 W. No preferred texture was observed in the EBSD maps due to the complex heat flux direction which was resulted in the reciprocating scanning strategy. With the increase of laser power, the proportion of high-angle grain boundaries increased from 33.1% to 46.4% and that of low-angle grain boundaries decreased from 66.9% to 53.6%. The sample fabricated at 2000 W had the highest mean microhardness (331 HV0.2) and the best combination of ultimate tensile strength (757 MPa) and elongation (9.1%). However, the sample fabricated at 2200 W had the best impact toughness (a(ku) = 100.0 J/cm(2)) because it contained a large amount of GB1 with dispersive and spherical-like island structures. This study provides the theoretical and experimental basis for the design of laser power and controllability of microstructure and properties in the DLD alloy steel process.
机译：本文通过直接激光沉积（DLD）技术成功地制备了12CrNi2合金钢样品。研究了DLD 12CrNi2合金钢在1800 W，2000 W和2200 W的不同激光功率下贝氏体的演变以及沉积后样品的力学性能。结果表明，随着激光功率的增加，在不同激光功率下制备的样品的中上微观结构从板条贝氏体（LB）转变为颗粒贝氏体（GB）。另外，根据不同的形成机理，将粒状贝氏体分为块状粒状贝氏体（GB1）和板条状粒状贝氏体（GB2），在2000 W〜2200 W的激光功率范围内，GB1的量增加而GB2的量减少。由于复杂的热通量方向，因此在EBSD图中未观察到优选的纹理，这导致了往复扫描策略。随着激光功率的增加，高角度晶界的比例从33.1％增加到46.4％，而低角度晶界的比例从66.9％下降到53.6％。在2000 W下制作的样品具有最高的平均显微硬度（331 HV0.2）和极限拉伸强度（757 MPa）和延伸率（9.1％）的最佳组合。但是，以2200 W的功率制造的样品具有最佳的冲击韧性（a（ku）= 100.0 J / cm（2）），因为它包含大量具有分散和球形岛结构的GB1。该研究为DLD合金钢工艺中激光功率的设计以及组织和性能的可控性提供了理论和实验依据。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|150-161|共12页
  • 作者

    Zhou Yue; Chen Suiyuan; Chen Xueting; Cui Tong; Liang Jing; Liu Changsheng;

  • 作者单位

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

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

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

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

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

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

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  • 正文语种 eng
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  • 关键词

    Direct laser deposition; 12CrNi2 alloy steel; laser power; Bainite evolution; Mechanical properties;

    机译：直接激光沉积;12CrNi2合金钢;激光功率;贝氏体演化;力学性能;

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