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arXiv 2303.04764cond-mat.mtrl-sci
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定向能量沉积Laser增材制造高温合金晶粒内的高分辨率三维应变和取向映射

High Resolution 3D Strain and Orientation Mapping within a Grain of a Directed Energy Deposition Laser Additively Manufactured Superalloy

Y. Chen, Y. T. Tang, D. M. Collins, S. J. Clark, W. Ludwig, R. Rodriguez-Lamas, C. Detlefs, R. C. Reed, P. D. Lee, P. J. Withers, C. Yildirim

摘要:

激光增材制造(LAM)的工业化面临着快速复杂的凝固过程带来的不良微观结构和高残余应力的挑战。因此,控制变形图案化的机械性能的非破坏性评估是至关重要的。在这里,我们使用暗场X射线显微镜(DFXM)非破坏性地映射的3D晶内取向和应变变化在整个表面断裂晶粒内的定向能量沉积镍高温合金。DFXM结果揭示了一个高度异质性的三维微观结构的局部取向和晶格应变。该晶粒包括具有交替应变状态的$\approx$ 5 $μ$ m尺寸单元,高达5 $\times 10^{-3}$,并且取向差<0.5°。DFXM的结果进行了比较,从其截止表面相同的晶粒的电子背散射衍射测量。我们讨论了LAM过程中的微观结构的发展,合理化的发展过程中的极端热梯度和溶质偏析的敏感性的变形图案。

英文摘要:

The industrialization of Laser Additive Manufacturing (LAM) is challenged by the undesirable microstructures and high residual stresses originating from the fast and complex solidification process. Non-destructive assessment of the mechanical performance controlling deformation patterning is therefore critical. Here, we use Dark Field X-ray Microscopy (DFXM) to non-destructively map the 3D intragranular orientation and strain variations throughout a surface breaking grain within a directed energy deposition nickel superalloy. DFXM results reveal a highly heterogenous 3D microstructure in terms of the local orientation and lattice strain. The grain comprises $\approx$ 5$μ$m-sized cells with alternating strain states, as high as 5 $\times 10^{-3}$, and orientation differences <0.5° . The DFXM results are compared to Electron Backscatter Diffraction measurements of the same grain from its cut-off surface. We discuss the microstructure developments during LAM, rationalising the development of the deformation patterning from the extreme thermal gradients during processing and the susceptibility for solute segregation.

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