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首页> 外文期刊>Journal of Materials Research >Laser solid forming assisted by friction stir processing for preparation of Ni-16Cr-8Fe alloys: Crack repairing and grain refinement
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Laser solid forming assisted by friction stir processing for preparation of Ni-16Cr-8Fe alloys: Crack repairing and grain refinement

机译：摩擦搅拌加工用于形成Ni-16Cr-8Fe合金的激光固体成形：裂纹修复和细化

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摘要

Although laser solid forming (LSF) has a wide range of applications in material manufacturing, the technique has been severely limited due to the solidification cracks during rapid laser melting/solidification. In this paper, an LSF technology assisted by friction stir processing (FSP) is proposed to eliminate the LSF crack through the FSP thermomechanical coupling effect, with the Ni-16Cr-8Fe alloy as a representative material. By FSP-assisted LSF, the cracks at the top surface of the Ni-16Cr-8Fe alloy layer were eliminated. Meanwhile, the severe plastic deformation layers can be observed and gradient grains with tens of nanometers to tens of micrometers from the top surface to the inner. The LSF-printed dendrite microstructure was transformed into nanocrystals or nanotwins in the deformation zone with twining as the main deformation mechanism. The grain refinement results in the increase of hardness about 30%.
机译：尽管激光固体成形（LSF）在材料制造中具有广泛的应用范围，但是由于快速激光熔化/固化过程中的固化裂纹，该技术受到了严重的限制。本文提出了一种以摩擦搅拌工艺（FSP）为辅助的LSF技术，以Ni-16Cr-8Fe合金为代表材料，通过FSP热力耦合效应消除LSF裂纹。通过FSP辅助的LSF，消除了Ni-16Cr-8Fe合金层顶表面的裂纹。同时，可以观察到严重的塑性变形层，并且从顶表面到内部的晶粒具有数十纳米到数十微米的梯度。 LSF印刷的枝晶微观结构在变形区以孪晶为主要变形机理转变为纳米晶体或纳米孪晶。晶粒细化导致硬度增加约30％。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3521-3529|共9页
  • 作者

    Niu Pengda; Li Ruidi; Yuan Tiechui; Wang Minbo; Xie Siyao; Wu Hong;

  • 作者单位

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, State Key Lab Powder Met, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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