氧扩散对SLM法制备Ti6Al4V晶格结构后处理的影响

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2022-02-16 DOI:10.1115/1.4053870
H. Salem, Peter Ibrahim, Moataz M. Attallah, H. Salem
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引用次数: 0

摘要

使用热等静压(HIPing)和热处理(HT)对使用选择性激光熔化(SLM)制造的Ti6Al4V晶格结构进行后处理,以减轻SLM期间快速冷却的不期望影响。后处理过程中的氧扩散对晶格的微观结构和随后的机械性能有显著影响。进行氧含量分析以确认氧通过结构外围的扩散。研究了HIPing和亚透射HT(600-800°C)过程中氧扩散对晶格相变、失效机制和力学性能的影响。结果表明,初始形成的α′马氏体的转变与后处理温度有关。这种转变导致屈服强度下降。在所有处理条件下,失效应变(延展性)的降低与氧扩散有关,形成近表面α情况。
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Effect of Oxygen Diffusion During the Post-Processing Of Ti6Al4V Lattice Structures Fabricated by the SLM Process
Post-processing of Ti6Al4V lattice structures fabricated using selective laser melting (SLM) was performed using hot isostatic pressing (HIPing) and heat treatment (HT) to mitigate the undesired effect of rapid cooling during SLM. Oxygen diffusion during post-processing had a significant influence on the microstructure and subsequently the mechanical properties of the lattices. Oxygen content analysis was conducted to confirm the oxygen diffusion through the strurts' peripheries. The effect of oxygen diffusion during the HIPing and sub-transus HT (600-800 °C) regimes on the phase transformation, failure mechanisms and mechanical properties of the lattices was investigated. Results revealed that the transformation of the originally formed α' martensite was dependent on the post-processing temperature. This transformation resulted in a decrease in yield strength. The decrease in failure strain (ductility) for all treated conditions was related to oxygen diffusion, forming near-surface α-case.
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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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