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首页> 外文期刊>Materials Science and Engineering >Effects of stress-relief heat treatment on the microstructure and fatigue property of a laser additive manufactured 12CrNi2 low alloy steel
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Effects of stress-relief heat treatment on the microstructure and fatigue property of a laser additive manufactured 12CrNi2 low alloy steel

机译：应力减轻热处理对激光添加剂的微观结构和疲劳性能的影响12crNi2低合金钢

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摘要

In this study, the impact of stress-relief heat treatment on the microstructure and fatigue property of a laser melting deposited (LMD) 12CrNi2 low alloy steel was analyzed. Microstructural evolution of processed LMD 12CrNi2 steel by heat treatment was studied using electron backscatter diffraction (EBSD) and X-ray diffraction (XRD), aiming to establish a rational microstructure-fatigue property relationship. The results showed that the main phase of the samples before and after heat treatment was α-Fe phase, whereas the lattice parameter slightly decreased after annealing, as a result of stress relief and carbide formation in the heat-treated samples. Meanwhile, the increase of the hard and diffusely distributed carbides inside the matrix was the main contributor for the higher material strength. Based on the EBSD analysis, the heat treatment decreased grain boundary misorientation leading to a corresponding reduction in the dislocation density, and increased the content of high-angle grain boundaries (HAGBs) promoting the toughness of the material. Furthermore, Schmid factor results revealed that the heat-treated samples exhibited a relatively high ductility resulting from the activation for more slip systems during the cyclic deformation. The stress-relief heat treatment significantly improved the fatigue performance of samples, which was attributed to the enhanced strength and ductility owing to the related microstructure change and the relief of residual stresses.
机译：在该研究中，分析了对沉积的激光熔化的微观结构和疲劳性能的影响（LMD）12crNi2低合金钢的影响。使用电子背散射衍射（EBSD）和X射线衍射（XRD）研究了通过热处理进行加工LMD 12CrNi2钢的微观结构演化，旨在建立合理的微观结构 - 疲劳性关系。结果表明，热处理前后样品的主阶段是α-Fe阶段，而退火后晶格参数略微降低，导致热处理样品中的应力浮雕和碳化物形成。同时，基质内部的硬质和漫长的分布式碳化物的增加是较高材料强度的主要因素。基于EBSD分析，热处理降低了晶界误导，导致位错密度的相应降低，增加了促进材料韧性的高角度晶界（HAGBS）的含量。此外，施密因子结果表明，热处理样品表现出相对高的延展性，该延展性由在循环变形期间对更多滑动系统的激活产生。压力缓解热处理显着提高了样品的疲劳性能，这归因于由于相关的微观结构变化和残余应力的浮雕而归因于增强的强度和延展性。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139738.1-139738.8|共8页
  • 作者

    X. Cui; S. Zhang; C. Wang; C.H. Zhang; J. Chen; J.B. Zhang;

  • 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;

    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;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser additive manufacturing; 12CrNi2 low alloy steel; Heat treatment; Microstructure; Fatigue property;

    机译：激光添加剂制造;12crni2低合金钢;热处理;微观结构;疲劳性质;

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