نتایج جستجو برای: 4cr

تعداد نتایج: 207  

2017
Hiroaki Matsumoto Daiki Naito Kento Miyoshi Kenta Yamanaka Akihiko Chiba Yoko Yamabe-Mitarai

This work identifies microstructural conversion mechanisms during hot deformation (at temperatures ranging from 750 °C to 1050 °C and strain rates ranging from 10-3 s-1 to 1 s-1) of a Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17) alloy with a lamellar starting microstructure and establishes constitutive formulae for predicting the microstructural evolution using finite-element analysis. In the α phase, lamell...

Journal: :IEEE Transactions on Aerospace and Electronic Systems 2023

Traditional multi-beam Geostationary (GEO) satellite communication systems provide broadband coverage using a regular grid of fixed spot-beams with uniform 4-colour frequency (4CR) reuse scheme. However, user distribution is non-uniform on ground and, consequently, the demand varies geographically. One potential solution to address high-demand regions enhance beam gain only in those areas. In t...

Journal: :Additive manufacturing 2021

The microstructure and tensile properties of β-containing Ti–44Al–4Cr alloy rods additively manufactured by electron beam melting (EBM) process were examined as a function input energy density determined the processing parameters. To best our knowledge, this is first report to demonstrate that two types fine microstructures have been obtained in γ-TiAl alloys varying during EBM process. A unifo...

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