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首页> 外文期刊>Materials Science and Engineering >Functionally graded bimodal Ti6A14V fabricated by powder bed fusion additive manufacturing: Crystal plasticity finite element modelling
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Functionally graded bimodal Ti6A14V fabricated by powder bed fusion additive manufacturing: Crystal plasticity finite element modelling

机译：通过粉末床熔融增材制造制造的功能梯度双峰Ti6A14V：晶体塑性有限元建模

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摘要

The paper investigates the effects of secondary α_s phase lath thickness and the primary α' phase content in microstructural functionally graded Ti6A14V through a dual-phase crystal plasticity finite element (CPFE) model. Existing experimental studies have identified two microstructure parameters that were varied in the micro-structure of dual phase Ti6A14V, namely α_s, lath thickness and primary α' phase content. However, existing FGM simulation studies to date only focused on the gradient in grain size. Therefore, the present study examined lath thickness and primary phase content as design inputs. A total of 12 parameters combinations were studied in homogeneous crystal plasticity models. The α' phase content was varied from 60% to 95%. Within the remaining phase lamellae structure, the lath thickness was varied from 0.15 μm to 6.20 μm. As a result, a rule of mixtures relation was found between the a' phase content and both the resulting elastic and plastic properties. A proportional Hall-Petch like correlation between α_s lath width and yield strength was established. Based on these findings, microstructures with varying the lath thickness were studied in a newly developed finite element model. Uniform stress and uniform strain boundary conditions were applied to this FGM, and the resulting behaviour was predicted.
机译：本文通过双相晶体可塑性有限元（CPFE）模型研究了功能化梯度Ti6A14V中次生α_s相板条厚度和主要α'相含量的影响。现有的实验研究已经确定了在双相Ti6A14V的微观结构中变化的两个微观结构参数，即α_s，板条厚度和主要α'相含量。但是，迄今为止，现有的FGM模拟研究仅关注晶粒尺寸的梯度。因此，本研究检查了板条厚度和主相含量作为设计输入。在均质晶体可塑性模型中总共研究了12个参数组合。 α'相含量从60％变化到95％。在其余的相薄片结构中，板条厚度从0.15μm变化到6.20μm。结果，在a′相含量与所得的弹性和塑性性质之间发现了混合关系的规则。建立了α_s板条宽度与屈服强度之间的比例霍尔-Petch状相关性。基于这些发现，在新开发的有限元模型中研究了具有不同板条厚度的微结构。将均匀的应力和均匀的应变边界条件应用于此FGM，并预测了所得行为。

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