用δ和氢分布预测锆-4合金断裂成核的热机械微观结构

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
I. Mohamed, T. Hasan, M. Zikry
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引用次数: 3

摘要

将晶体位错密度公式与非线性有限元(FE)方法结合起来,用于理解和预测具有面心立方(f.c.c.)或体心立方(b.c.c.)氢化物的氢化物的六方最紧密堆积(h.c.p.)锆合金系统的热机械行为。然后,将该公式与最近开发的断裂方法结合使用,该方法适用于有限非弹性应变和多相晶体系统,以了解不同的基于微观结构的断裂模式如何成核和传播。已经表示了具有必要取向关系(OR)的不同晶体氢化物和基体相的相互关联的微观结构特征,从而可以预测氢化物布居和基体的同时热机械失效模式对断裂成核和扩展的详细物理理解。研究了氢化物的体积分数、形态、晶体结构以及取向和分布对径向、周向和混合分布的同时断裂模式和多种断裂模式的影响。另一个关键方面是考虑由于热传导和耗散塑性功的影响及其对断裂的集体影响而引起的温度变化。对于经受高温的氢化聚集体,由于位错密度活性的增加,热软化导致更高的延展性,这导致了更高的剪切应变积累,并抑制了裂纹的形核和生长。这些预测提供了对为什么在不同体积分数和热机械载荷条件下,环向氢化物比径向氢化物更耐断裂的有效见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermomechanical Microstructural Predictions of Fracture Nucleation of Zircaloy-4 Alloys With δ and ɛ Hydride Distributions
A crystalline dislocation-density formulation that was incorporated with a nonlinear finite-element (FE) method was utilized to understand and to predict the thermomechanical behavior of an hexagonal closest packed (h.c.p.) zircaloy system with hydrides with either face-centered cubic (f.c.c.) or body-centered cubic (b.c.c.) hydrides. This formulation was then used with a recently developed fracture methodology that is adapted for finite inelastic strains and multiphase crystalline systems to understand how different microstructurally based fracture modes nucleate and propagate. The interrelated microstructural characteristics of the different crystalline hydride and matrix phases with the necessary orientation relationships (ORs) have been represented, such that a detailed physical understanding of fracture nucleation and propagation can be predicted for the simultaneous thermomechanical failure modes of hydride populations and the matrix. The effects of volume fraction, morphology, crystalline structure, and orientation and distribution of the hydrides on simultaneous and multiple fracture modes were investigated for radial, circumferential, and mixed distributions. Another key aspect was accounting for temperatures changes due to the effects of thermal conduction and dissipated plastic work and their collective effects on fracture. For hydrided aggregates subjected to high temperatures, thermal softening resulted in higher ductility due to increased dislocation-density activity, which led to higher shear strain accumulation and inhibited crack nucleation and growth. The predictions provide validated insights into why circumferential hydrides are more fracture-resistant than radial hydrides for different volume fractions and thermomechanical loading conditions.
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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