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首页> 外文期刊>Materials Science and Engineering >EBSD analysis of creep deformation induced grain lattice distortion: A new method for creep damage evaluation of austenitic stainless steels
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EBSD analysis of creep deformation induced grain lattice distortion: A new method for creep damage evaluation of austenitic stainless steels

机译：蠕变变形引起的晶格畸变的EBSD分析：一种评估奥氏体不锈钢蠕变损伤的新方法

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摘要

Creep damage of austenitic stainless steels was evaluated by Electron Back-Scattered Diffraction (EBSD) analysis of creep deformation induced grain lattice distortion in this research. Based on the existing work of plasticity characterization by EBSD misorientation parameters, we used the grain lattice distortion parameter “Grain Reference Orientation Deviation (GROD)” obtained from EBSD analysis to estimate the creep strainεcreepof austenitic stainless steels by their linear correlationεcreep=(7.2∙GROD−2.4)%independent of creep conditions (stressσ0& temperature T) and average grain sizeDGrain. Then the creep damage ratio (creep time fractiont/tr) was further evaluated from the estimated creep strainεcreepby constitutive equation describing theεcreep~t/trcreep curve, which takes the influence of creep conditions(σ0,T)into consideration. Compared with the previous work, this research developed a quantitative creep damage evaluation model with EBSD misorientation parameterGRODas input, creep damage ratiot/tras output, and creep conditions(σ0,T)as environmental parameters. The final accuracy of the creep damage ratio evaluated by this new model can reach up to ± 30%.
机译：本研究通过蠕变引起的晶格畸变的电子背散射衍射（EBSD）分析来评估奥氏体不锈钢的蠕变损伤。基于现有的通过EBSD取向错误参数表征塑性的工作，我们使用从EBSD分析获得的晶格畸变参数“晶粒参考取向偏差（GROD）”，通过其线性相关系数εcreep=（7.2∙GROD）估算奥氏体不锈钢的蠕变应变εcreep。 −2.4）％与蠕变条件（应力σ0温度T）和平均晶粒尺寸DGrain无关。然后，通过描述蠕变-t /蠕变曲线的本构方程，从估计的蠕变应变ε蠕变进一步评估蠕变损伤率（蠕变时间分数t / tr），其中考虑了蠕变条件（σ0，T）的影响。与以前的工作相比，本研究建立了定量蠕变损伤评估模型，以EBSD取向错误参数GROD为输入，蠕变损伤比率t / tras输出，蠕变条件（σ0，T）作为环境参数。该新模型评估的蠕变损伤率的最终精度可以达到±30％。

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  • 来源
    《Materials Science and Engineering》 |2018年第22期|329-337|共9页
  • 作者

    Shao-Shi Rui; Yi-Bo Shang; Ya-Nan Fan; Qi-Nan Han; Li-Sha Niu; Hui-Ji Shi; Keita Hashimoto; Nobuyoshi Komai;

  • 作者单位

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University;

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University,PMT Collaborative Design Department, Beijing Jingwei Hirain Technologies Co., Ltd;

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University;

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University,Aircraft Strength Research Institute of China;

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University;

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University;

    Materials Research Department, Research & Innovation Center, Mitsubishi Heavy Industries, Ltd;

    Materials Research Department, Research & Innovation Center, Mitsubishi Heavy Industries, Ltd;

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

    EBSD analysis; Austenitic stainless steel; Grain lattice distortion; Creep damage evaluation;

    机译：EBSD分析;奥氏体不锈钢;晶粒晶格畸变;蠕变损伤评估;

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