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增材制造微结构演化及疲劳分散性计算

易敏 常珂 梁晨光 周留成 杨阳祎玮 易新 胥柏香

易敏, 常珂, 梁晨光, 周留成, 杨阳祎玮, 易新, 胥柏香. 增材制造微结构演化及疲劳分散性计算. 力学学报, 2021, 53(12): 3263-3273 doi: 10.6052/0459-1879-21-389
引用本文: 易敏, 常珂, 梁晨光, 周留成, 杨阳祎玮, 易新, 胥柏香. 增材制造微结构演化及疲劳分散性计算. 力学学报, 2021, 53(12): 3263-3273 doi: 10.6052/0459-1879-21-389
Yi Min, Chang Ke, Liang Chenguang, Zhou Liucheng, Yang Yangyiwei, Yi Xin, Xu Baixiang. Computational study of evolution and fatigue dispersity of microstructures by additive manufacturing. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(12): 3263-3273 doi: 10.6052/0459-1879-21-389
Citation: Yi Min, Chang Ke, Liang Chenguang, Zhou Liucheng, Yang Yangyiwei, Yi Xin, Xu Baixiang. Computational study of evolution and fatigue dispersity of microstructures by additive manufacturing. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(12): 3263-3273 doi: 10.6052/0459-1879-21-389

增材制造微结构演化及疲劳分散性计算

doi: 10.6052/0459-1879-21-389
基金项目: 国家海外高层次人才引进计划青年项目, 航空发动机及燃气轮机重大专项(J2019-IV-0014-0082)和中央高校基本科研业务费和德国科学基金DFG (CRC-TRR 270, DFG YI 165/1-1) 资助项目
详细信息
    作者简介:

    易敏, 教授, 主要研究方向: 先进材料结构和先进制造的多尺度多场耦合力学. E-mail: yimin@nuaa.edu.cn

  • 中图分类号: TB301

COMPUTATIONAL STUDY OF EVOLUTION AND FATIGUE DISPERSITY OF MICROSTRUCTURES BY ADDITIVE MANUFACTURING

  • 摘要: 为了预测增材制造中工艺参数−微结构−力学性能之间的关联规律, 提出了集成离散元、相场模拟、晶体塑性有限元和极值概率理论的计算方法, 揭示了激光扫描速度对微结构演化、屈服应力和疲劳分散性的影响. 首先, 采用离散元实现了重力作用下粉床在已凝固层表面上的逐层铺设; 其次, 通过热−熔体−微结构耦合的非等温相场模拟, 获得了熔体、气孔、晶界、晶粒取向等的时空演化以及最终形成的多晶微结构; 然后, 应用晶体塑性有限元计算了增材制造多晶微结构的宏观力学响应, 并得到表征疲劳裂纹萌生驱动力的疲劳指示参数(FIP); 最后, 采用极值概率理论分析了增材制造多晶微结构的FIP极值分布规律及疲劳分散性. 以316L不锈钢选区激光熔化增材制造为例的计算结果表明: 增材制造微结构的宏观屈服强度随激光扫描速度的增加而降低, 且呈各向异性; FIP极值符合Gumbel极值分布规律, 激光扫描速度增加可降低增材制造微结构疲劳分散性, 但会导致FIP极值升高, 使得疲劳裂纹萌生驱动力增加, 疲劳寿命降低.

     

  • 图  1  用于增材制造微结构演化及疲劳分散性预测的集成离散元、相场模拟、晶体塑性有限元和极值概率理论的计算框架示意图(DEM: 离散元; PF: 相场; CPFEM: 晶体塑性有限元; FIP: 疲劳指示参数; EVD: 极值分布)

    Figure  1.  Computational framework integrating discrete element method, phase-field simulation, crystal plasticity finite element method, and extreme value statistics for the prediction of evolution and fatigue dispersity of microstructures by additive manufacturing (DEM: discrete element method; PF: phase field; CPFEM: crystal plasticity finite element method; FIP: fatigue indicator parameter; EVD: extreme value distribution)

    图  2  逐层选区激光熔化增材制造过程的微结构演化(v = 2 m/s)

    Figure  2.  Microstructure evolution during layer-by-layer selective laser melting (v = 2 m/s)

    图  3  选区激光熔化增材制造微结构及其孔隙率: (a) v = 2 m/s; (b) v = 1.5 m/s; (c) v = 1 m/s; (d) v = 0.5 m/s; (e) 图(a) ~ 图(d)中矩形区域(400 μm × 190 μm)的孔隙率, 其中圆形(90 W, 1 m/s)[44]和三角形(160 W, 1.2 m/s)[45]标记为实验结果

    Figure  3.  Microstructure and porosity obtained by selective laser melting: (a) v = 2 m/s; (b) v = 1.5 m/s; (c) v = 1 m/s; (d) v = 0.5 m/s; (e) porosity of the rectangular region (400 μm × 190 μm) in (a)-(d), with the circle (90 W, 1 m/s)[44] and triangle (160 W, 1.2 m/s)[45] markers indicating the experimental results

    图  4  选区激光熔化增材制造微结构力学性能

    Figure  4.  Mechanical property of microstructure from selective laser melting

    图  5  不同应变幅(εmax)下选区激光熔化增材制造微结构的循环应力-应变曲线

    Figure  5.  Macroscopic stress-strain cyclic response of microstructure from selective laser melting

    图  6  x方向不同应变幅(εmax)下单元FIP分布

    Figure  6.  Variation of elemental FIPs throughout the sample under different strain magnitude (εmax) along x axis

    图  7  体积平均FIP极值概率分布及其Gumbel函数拟合

    Figure  7.  Extreme value distributions of the volume averaged FIPs and their fit to the Gumbel distribution

    图  8  相对分散性参数($\;{\beta _0}/{u_0}$)变化曲线

    Figure  8.  Relative dispersion parameter ($\;{\beta _0}/{u_0}$) curves

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  • 收稿日期:  2021-08-12
  • 录用日期:  2021-09-12
  • 网络出版日期:  2021-09-13
  • 刊出日期:  2021-12-18

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