Study on electron beam cross-linked ethylene-tetrafluoroethylene copolymer-insulated cables for aerospace applications: Mechanical performance, crystallization kinetics, and fluoride precipitation

2018 ◽  
Vol 29 (5) ◽  
pp. 1497-1506 ◽  
Author(s):  
Jun Min ◽  
Zhaozeng Tao ◽  
Xupeng Song ◽  
Jin Zhang ◽  
Zenghui Wang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Crystallization Kinetics ◽  
Mechanical Performance ◽  
Aerospace Applications ◽  
Ethylene Tetrafluoroethylene

Mechanical Performance of a Non-weldable Ni-Base Superalloy: Inconel 738 Fabricated by Electron Beam Melting

2020 ◽  
pp. 1075-1084
Author(s):  
Michael M. Kirka ◽  
Patxi Fernandez-Zelaia ◽  
Yousub Lee ◽  
Peeyush Nandwana ◽  
Sean Yoder ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Mechanical Performance ◽  
Base Superalloy

scholarly journals Microstructural Characterization and Mechanical Properties of L-PBF Processed 316 L at Cryogenic Temperature

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5856
Author(s):  
Pragya Mishra ◽  
Pia Åkerfeldt ◽  
Farnoosh Forouzan ◽  
Fredrik Svahn ◽  
Yuan Zhong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Mechanical Performance ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
Temperature Range ◽  
Aerospace Applications

Laser powder bed fusion (L-PBF) has attracted great interest in the aerospace and medical sectors because it can produce complex and lightweight parts with high accuracy. Austenitic stainless steel alloy 316 L is widely used in many applications due to its good mechanical properties and high corrosion resistance over a wide temperature range. In this study, L-PBF-processed 316 L was investigated for its suitability in aerospace applications at cryogenic service temperatures and the behavior at cryogenic temperature was compared with room temperature to understand the properties and microstructural changes within this temperature range. Tensile tests were performed at room temperature and at −196 °C to study the mechanical performance and phase changes. The microstructure and fracture surfaces were characterized using scanning electron microscopy, and the phases were analyzed by X-ray diffraction. The results showed a significant increase in the strength of 316 L at −196 °C, while its ductility remained at an acceptable level. The results indicated the formation of ε and α martensite during cryogenic testing, which explained the increase in strength. Nanoindentation revealed different hardness values, indicating the different mechanical properties of austenite (γ), strained austenite, body-centered cubic martensite (α), and hexagonal close-packed martensite (ε) formed during the tensile tests due to mechanical deformation.

Correlation Between Microstructure and Mechanical Properties in an Inconel 718 Deposit Produced Via Electron Beam Freeform Fabrication

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Wesley A. Tayon ◽  
Ravi N. Shenoy ◽  
MacKenzie R. Redding ◽  
R. Keith Bird ◽  
Robert A. Hafley
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Crystallographic Texture ◽  
Inconel 718 ◽  
Electron Backscatter Diffraction ◽  
Microstructural Characterization ◽  
Freeform Fabrication ◽  
Aerospace Applications ◽  
Evolution Of Microstructure ◽  
Texture Characterization

Electron beam freeform fabrication (EBF3), a metallic layer-additive manufacturing process, uses a high-power electron beam in conjunction with a metal feed wire to create a molten pool on a substrate, which on solidification produces a component of the desired configuration made of sequentially deposited layers. During the build-up of each solidified layer, the substrate is translated with respect to the electron beam and the feed wire. EBF3 products are similar to conventional cast products with regard to the as-deposited (AD) microstructure and typical mechanical properties. Inconel 718 (IN 718), a high-temperature superalloy with attractive mechanical and oxidation properties well suited for aerospace applications, is typically used in the wrought form. The present study examines the evolution of microstructure, crystallographic texture, and mechanical properties of a block of IN 718 fabricated via the EBF3 process. Specimens extracted out of this block, both in the AD and in a subsequently heat treated (HT) condition, were subjected to (1) microstructural characterization using scanning electron microscopy (SEM); (2) in-plane elastic modulus, tensile strength, and microhardness evaluations; and (3) crystallographic texture characterization using electron backscatter diffraction (EBSD). Salient conclusions stemming from this study are: (1) mechanical properties of the EBF3-processed IN 718 block are strongly affected by texture as evidenced by their dependence on orientation relative to the EBF3 fabrication direction, with the AD EBF3 properties generally being significantly reduced compared to wrought IN 718; (2) significant improvement in both strength and modulus of the EBF3 product to levels nearly equal to those for wrought IN 718 may be achieved through heat treatment.

scholarly journals The Influence of Process Parameters and Build Orientation on the Creep Behaviour of a Laser Powder Bed Fused Ni-based Superalloy for Aerospace Applications

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1390 ◽  
Author(s):  
Hani Hilal ◽  
Robert Lancaster ◽  
Spencer Jeffs ◽  
John Boswell ◽  
David Stapleton ◽  
...  
Keyword(s):  
Process Parameters ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
Creep Behaviour ◽  
Test Method ◽  
Influence Of Process Parameters ◽  
Powder Bed ◽  
Build Orientation ◽  
Aerospace Applications ◽  
Layer Manufacturing

Additive Layer Manufacturing (ALM) is an innovative net shape manufacturing technology that offers the ability to produce highly intricate components not possible through traditional wrought and cast procedures. Consequently, the aerospace industry is becoming ever more attentive in exploiting such technology for the fabrication of nickel-based superalloys in an attempt to drive further advancements within the holistic gas turbine. Given this, the requirement for the mechanical characterisation of such material is rising in parallel, with limitations in the availability of material processed restricting conventional mechanical testing; particularly with the abundance of process parameters to evaluate. As such, the Small Punch Creep (SPC) test method has been deemed an effective tool to rank the elevated temperature performance of alloys processed through ALM, credited to the small volumes of material utilised in each test and the ability to sample material from discrete locations. In this research, the SPC test will be used to assess the influence of a number of key process variables on the mechanical performance of Laser Powder Bed Fused (LPBF) Ni-based superalloy CM247LC. This will also include an investigation into the influence of build orientation and post-build treatment on creep performance, whilst considering the structural integrity of the different experimental builds.

Investigation of microstructure and mechanical performance in IN738LC joint by vacuum electron beam welding

Vacuum ◽  
2019 ◽  
Vol 162 ◽  
pp. 214-227 ◽  
Author(s):  
Ke Han ◽  
Houqin Wang ◽  
Fei Peng ◽  
Binggang Zhang ◽  
Lei Shen
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
Mechanical Performance

scholarly journals Tensile mechanical performance of electron-beam welded joints from aluminum alloy (Al-Mg-Si) 6156

2016 ◽  
Vol 2 ◽  
pp. 3539-3545 ◽  
Author(s):  
Nikolaos D. Alexopoulos ◽  
Theano N. Examilioti ◽  
Vasilis Stergiou ◽  
Stavros K. Kourkoulis
Keyword(s):  
Aluminum Alloy ◽  
Electron Beam ◽  
Welded Joints ◽  
Mechanical Performance

scholarly journals Mechanical performance research of friction stir welding robot for aerospace applications

2021 ◽  
Vol 18 (1) ◽  
pp. 172988142199654
Author(s):  
Haitao Luo ◽  
Fengqun Zhao ◽  
Siwei Guo ◽  
Changshuai Yu ◽  
Guangming Liu ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Working Conditions ◽  
Mechanical Performance ◽  
Welding Process ◽  
Normal Displacement ◽  
Welding Robot ◽  
Friction Stir ◽  
Aerospace Applications ◽  
System Composition ◽  
Strength And Stiffness

The friction stir welding robot for aerospace applications developed by the research group is subject to the effects of size, working conditions, and other conditions during the operation. The load conditions of the friction stir welding robot are harsh, and the strength and stiffness tests of the whole machine need to be carried out. Five typical working conditions of the friction stir welding robot are analyzed. By analyzing the system composition and configuration of the robot, the loading conditions of the robot stirring head during the welding process are accurately simulated, and this is used as the stiffness and strength check. The boundary conditions of the robot are simulated and analyzed under typical working conditions. The results show that the data of each part of the robot under load are obtained for a given size of the rocket cap welding. After analysis, the maximum normal displacement of the friction stir welding robot reached 0.6424 mm and the maximum stress was 79.21 MPa under the condition of melon flap welding.

scholarly journals Effect of Radiation-Induced Cross-Linking on Thermal Aging Properties of Ethylene-Tetrafluoroethylene for Aircraft Cable Materials

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 257
Author(s):  
Xiaodong Zhang ◽  
Fei Chen ◽  
Zhimin Su ◽  
Taiping Xie
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Thermo Gravimetric Analysis ◽  
Thermal Characteristics ◽  
Volume Resistivity ◽  
Cross Linking ◽  
Gravimetric Analysis ◽  
Aging Properties ◽  
Radiation Induced ◽  
Ethylene Tetrafluoroethylene

The effects of electron beam irradiation on ethylene-tetrafluoroethylene copolymer (ETFE) were studied. Samples were irradiated in air at room temperature by a universal electron beam accelerator for various doses. The effect of irradiation on samples and the cross-linked ETFE after aging were investigated with respect to thermal characteristics, crystallinity, mechanical properties, and volume resistivity using thermo-gravimetric analysis (TGA), differential scanning calorimeter (DSC), universal mechanical tester, and high resistance meter. TGA showed that thermal stability of irradiated ETFE is considerably lower than that of unirradiated ETFE. DSC indicates that crystallinity is altered greatly by cross-link. The analysis of mechanical properties, fracture surface morphology, visco-elastic properties and volume resistivity certify radiation-induced cross-linking is vital to aging properties.

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