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Constitutive modeling and failure mechanisms of anisotropic tensile and creep behaviors of nickel-base directionally solidified superalloy

机译：镍基定向凝固高温合金各向异性拉伸和蠕变行为的本构模型和破坏机理

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摘要

A transversely isotropic continuum elasto-viscoplasticity model is formulated to capture the tensile and creep behaviors of a directionally solidified (DS) nickel-base superalloy. A fourth-order tensor is introduced to model material anisotropy. The Kachanov damage evolution equation is coupled with stress tensor to improve capability of modeling creep deformation. This model is implemented as an ABAQUS user material (UMAT) subroutine using a self-adaptive explicit integration scheme. A grouping optimization strategy is employed to identify the material parameters by fitting experimental curves of isothermal tension and creep loading at high temperature. Failure mechanisms are investigated by observing the fracture morphology by means of Scanning Electron Microscope (SEM) with the Energy Dispersive X-ray Spectrometer (EDXS). The results obtained showed that Chaboche constitutive model coupled with anisotropy and creep damage was able to characterize the rate-dependent anisotropic tensile and creep behaviors of DS superalloy and the simulation results agreed well with the experimental data. The tensile fracture surface of DS superalloy mainly contained a mixture of large cleavage planes and small amount of dimples. Meanwhile, the creep fracture mechanism of DS superalloy at 760 and 850 ℃ was transgran-ular fracture induced by the dimple accumulation. The morphology of the dimples and non-metallic inclusions at 760 ℃ was different from that at 850 ℃.
机译：建立了横观各向同性的连续弹塑性-粘塑性模型，以捕获定向凝固（DS）镍基高温合金的拉伸和蠕变行为。引入四阶张量以模拟材料各向异性。 Kachanov损伤演化方程与应力张量耦合以提高对蠕变变形建模的能力。该模型使用自适应显式集成方案作为ABAQUS用户资料（UMAT）子例程实现。采用分组优化策略，通过拟合高温下的等温张力和蠕变载荷的实验曲线来确定材料参数。通过使用能量色散X射线光谱仪（EDXS）的扫描电子显微镜（SEM）观察断裂形态来研究破坏机理。所得结果表明，Chaboche本构模型与各向异性和蠕变损伤相结合能够表征DS超级合金的速率依赖性各向异性拉伸和蠕变行为，并且仿真结果与实验数据吻合良好。 DS高温合金的拉伸断裂表面主要包含大的分裂面和少量的凹坑。同时，DS高温合金在760和850℃下的蠕变断裂机理是由酒窝积聚引起的经晶断裂。 760℃下的凹痕和非金属夹杂物的形态不同于850℃下的形态。

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