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首页> 外文期刊>Journal of engineering materials and technology >Defect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys
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Defect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys

机译：航空合金热机械加工的缺陷发生与建模

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摘要

Mechanism-based models for the evolution of defects during the thermomechanical processing of aerospace titanium- and nickel-based alloys are reviewed. These defects include those comprising microstructural/metal-flow irregularities and those that are damage related (i.e., cracks and cavities). The development of undesirableonuniform microstructures and cavities during the mill processing of alpha/beta titanium alloys is addressed first. Relatively simple, diffusion-based models of spheroidization and coarsening are applied to quantify the propensity for micro structure nonuniformities. Similarly, first-order micromechanical models have been formulated to estimate the effect of local crystallographic texture on nonuniform flow, the generation of triaxial stresses, and cavity growth/closure in alpha/beta titanium alloys with a colony-alpha microstructure. The occurrence of nonuniform grain structures (and so-called ALA, or "as large as," grains) in cast, wrought, and powder-metallurgy superalloys is also discussed. A physics-based model to treat the topology of recrystallization and the evolution of ALA grains in such materials is proposed.
机译：本文综述了基于机理的航空航天钛和镍基合金热机械加工过程中缺陷演变的模型。这些缺陷包括那些具有微观结构/金属流动不规则性的缺陷以及与损伤有关的那些缺陷（即裂缝和空洞）。首先要解决在α/β钛合金铣削加工过程中不希望的/不均匀的微观结构和空洞的发展。相对简单的，基于扩散的球化和粗化模型可用于量化微观结构不均匀性的倾向。类似地，已经建立了一级微机械模型来估计局部晶体织构对非均匀流动，三轴应力的产生以及具有菌落-α微观结构的α/β钛合金中空腔生长/闭合的影响。还讨论了铸造，锻造和粉末冶金高温合金中不均匀晶粒结构（和所谓的ALA，或“与晶粒一样大”）的出现。提出了一种基于物理的模型来处理这种材料的重结晶拓扑和ALA晶粒的演化。

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