Isothermal Oxidation Behavior of As-deposited and HIPed Ti-48Al-2Cr-2Nb Alloy Processed using Electron Beam Powder Bed Fusion

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-01-08 DOI:10.1016/j.jallcom.2025.178568

Ravi C. Gurugubelli, Vamsi Krishna Balla, B. Rajasekaran, Prasad Krishna, Srikanth Bontha

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引用次数: 0

Abstract

This work focuses on oxidation behavior of Electron Beam Powder Bed Fusion (EB-PBF) processed Ti-48Al-2Cr-2Nb at elevated temperatures. Two different sample conditions were considered: As-deposited (AD) and post-processed by hot isostatic pressing (HIPed). The oxidation studies were carried out at 750°C, 850°C, and 950°C for 30, 60, and 100 hours. The oxidized samples were analyzed for oxide layer growth and kinetics using Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDS), Raman Spectroscopy, and X-ray Diffraction (XRD) techniques. Results indicate that oxide layers are composed of alternative bands of TiO₂ and Al₂O₃. These oxide layers spalled at 850°C and 950°C after an exposure of 100 h. The HIPed samples exhibited superior oxidation resistance when compared to AD samples, with an oxidation rate constant of 0.134 mg² cm⁴ h^-1 at 950°C (100 h). The presence of homogenized microstructure with large nano-scale lamellar colonies aided in uniform oxide layer growth. EB-PBF samples exhibit fine fully lamellar microstructure due to the rapid heating and cooling cycles. Hence EB-PBF (AD and HIPed) samples exhibited better oxidation resistance when compared to conventionally processed Ti-48Al-2Cr-2Nb.

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电子束粉末床熔合加工Ti-48Al-2Cr-2Nb合金的等温氧化行为

本文研究了电子束粉末床熔合（EB-PBF）处理的Ti-48Al-2Cr-2Nb在高温下的氧化行为。考虑了两种不同的样品条件：沉积态（AD）和热等静压后处理（HIPed）。氧化研究在750°C， 850°C和950°C下进行30,60和100小时。利用场发射扫描电镜（FESEM）、能量色散x射线能谱（EDS）、拉曼光谱（Raman Spectroscopy）和x射线衍射（XRD）技术对氧化样品的氧化层生长和动力学进行了分析。结果表明，氧化层由TiO2和Al2O3的交替带组成。这些氧化层在850°C和950°C下暴露100小时后剥落。与AD样品相比，HIPed样品在950°C（100小时）下的氧化速率常数为0.134 mg2 cm4 h-1，具有均匀的微观结构和大纳米级片层菌落的存在有助于氧化层的均匀生长。由于快速的加热和冷却循环，EB-PBF样品表现出良好的全层状微观结构。因此，与传统处理的Ti-48Al-2Cr-2Nb相比，EB-PBF （AD和HIPed）样品具有更好的抗氧化性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.