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Study on Effect of Laser Peening on Inconel 718 produced by DMLS technique

Vellore Institute of Technology-Nattudurai Navin Kumar, Chandrakant Yadav Aditya, Kumar Raja, Subramanian Prabhakaran, Chooriyaparambil Damodaran Naiju, Sivaperuman Kalainathan
  • Technical Paper
  • 2019-28-0146
To be published on 2019-10-11 by SAE International in United States
In Additive manufacturing, Direct Metal Laser Sintering is a rapid manufacturing technique used for manufacturing of functional components. Finely pulverized metal is melted using a high-energy fibre laser, by Island principle strategy produces mechanically and thermally stable metallic components with reduced thermal gradients, stresses & at high precision. Inconel is an austenitic chromium nickel based super alloy often used in the applications which require high strength & temperature resistant. It can retain its properties at high temperature, e.g. Engine components in aerospace, exhaust system in automobile applications etc. Here we attempts to analyze the effect of laser shock peening on DMLS Inconel 718 sample. Microstructure shows elliptical shaped structure and formation of new grain boundaries. Surface roughness of the material has been increased due to effect of laser shock pulse & ablative nature. 13 % Increase in macro hardness on the surface. Depth wise micro hardness was investigated, found to be 17% increase on the sub layer of the material due to the effect of hardened matrix formed by precipitation hardening and grain size refinement…
 

Effect of Cryogenic Treatment on Inconel 718 Produced by DMLS Technique

Vellore Institute of Technology-Chooriyaparambil Damodaran Naiju, Kumar Raja, Nattudurai Navin Kumar, Chandrakant Yadav Aditya, Muniappan Senthil Kumar
  • Technical Paper
  • 2019-28-0140
To be published on 2019-10-11 by SAE International in United States
The main purpose of this study is to investigate additive manufactured Inconel super alloy subjected to Cryogenic Treatment (CT). Cryogenic treatment mainly used in aerospace, defence and automobile application. Direct Metal Laser Sintering is an Additive manufacturing technique used for manufacturing of Complex and complicated functional components. Inconel is an austenitic chromium nickel based super alloy often used in the applications which require high strength & temperature resistant. In this work, we have made an attempt to study microstructure and mechanical properties of additive manufactured Inconel 718 when subjected to cryogenic treatment at three different time intervals. The micro-structural evolution of IN718 super-alloy before and after CT was investigated by both Optic Microscope (OM) and SEM. Surface roughness and hardness at different CT time intervals has also analyzed. Additionally, XRD technique was used to analyze the surface residual stress. The result shows after three cycles of CT-1(CT-2, CT-3), the hardness of Inconel 718 has been substantially improved at room temperature. Microstructure shows grains in CT-3 condition larger number of refined and uniformly distributed strengthening precipitates…
 

Wrenches, Twelve Spline, Metric

EG-1B Hand Tools Committee
  • Aerospace Standard
  • MA1547A
  • Current
Published 2019-05-10 by SAE International in United States
This standard covers the design, performance, and test requirements for high strength, thin wall, commercial sockets, universal sockets, and box wrenches used for the attachment and detachment of metric spline drive, high strength, and high temperature aircraft fasteners. Inclusion of dimensional data in this standard is not intended to imply that all of the products described herein are stock production sizes. Consumers are requested to consult with manufacturers concerning lists of stock production sizes. This standard is based on, but not limited to, the following external spline wrenching system:
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Experimental Study of a Heat-Pipe Exchanger for an Exhaust Heat Recovery System

Universidad de los Andes-Ernesto Rincon, Luis Munoz
Published 2019-04-02 by SAE International in United States
Currently, the heat recovery systems based on thermoelectrics are an important part of the technologies under study to improve the efficiency of vehicles with internal combustion engines. Different types of heat exchangers are used as part of the components for the operation of the heat recovery technologies. Among the heat exchangers, the heat pipes are studied due to their promising results. This work presents the experimental analysis of a heat exchanger prototype based in heat pipes. The prototype was custom designed for a given thermoelectric module. The design was performed seeking to maximize its efficiency while protecting the module by avoiding possible excesses of temperature during the operation. The requirements for the heat pipe design were defined from the experimental characterization of the thermoelectric module. The prototype was manufactured through a sintering process. The system was tested in the laboratory first by components, and then as a system. The results allow observing the potential of the use of heat pipes as part of heat recovery technologies. The design tested allowed guaranteeing an operating temperature range…
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Objectified Drivability Evaluation and Classification of Passenger Vehicles in Automated Longitudinal Vehicle Drive Maneuvers with Engine Load Changes

FEV Europe GmbH-Stefan Tegelkamp, Christopher Schmidt, Henning Roehrich, Martin Nijs, Johannes Scharf
RWTH Aachen University-Daniel Guse, Christian Heusch, Stefan Pischinger
Published 2019-04-02 by SAE International in United States
To achieve global market and brand specific drivability characteristics as unique selling proposition for the increasing number of passenger car derivatives, an objectified evaluation approach for the drivability capabilities of the various cars is required. Thereto, it is necessary to evaluate the influence of different engine concepts in various complex and interlinked powertrain topologies during engine load change maneuvers based on physical criteria. Such an objectification approach enables frontloading of drivability related engineering tasks by the execution of drivability development and calibration work within vehicle subcomponent-specific closed-loop real-time co-simulation environments in early phases of a vehicle development program. So far, drivability functionalities could be developed and calibrated only towards the end of a vehicle development program, when test vehicles with a sufficient level of product maturity became available. The resulting compaction and parallelization of the calibration work to meet the emissions, on-board diagnostics as well as the drivability requirements drastically reduces development costs and time.This article presents an objectified drivability evaluation and classification approach for passenger cars, which is based on physical criteria, developed at…
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Novel Dielectric Ceramic by Spark Plasma Sintering

  • Magazine Article
  • TBMG-34143
Published 2019-04-01 by Tech Briefs Media Group in United States

Researchers at NASA’s Marshall Space Flight Center have developed a new dielectric material based on barium titanate nanopowder processed via spark plasma sintering (SPS). The rapid and full densification achieved by SPS, together with a unique ceramic nanopowder processing approach, enables new ceramic materials with extremely high relative permittivity or dielectric constant.

 

Titanium Alloy, High Temperature Applications, Powder for Additive Manufacturing, Ti - 6.0Al - 2.0Sn - 4.0Zr - 2.0Mo

AMS AM Additive Manufacturing Metals
  • Aerospace Material Specification
  • AMS7014
  • Current
Published 2019-03-11 by SAE International in United States
This specification covers a heat-resistant titanium alloy in the form of pre-alloyed powder.
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Contaminant-Free Steel

  • Magazine Article
  • TBMG-33608
Published 2019-01-01 by Tech Briefs Media Group in United States

For many highly stressed engineering applications like bearings and gears, contaminated steel parts can lead to devastating outcomes such as an emergency shutdown or the end of a mission. Ensuring that these critical components are as homogeneous as possible and free from porosity and other flaws is vital to performance, yet conventional steelmaking processes have multiple pathways of entry for unwanted contamination.

 

Aluminum Beryllium, Preforms Hot Isostatic Pressed and Heat Treated 38Al - 62Be

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS7911D
  • Current
Published 2018-12-28 by SAE International in United States
This specification covers aluminum-beryllium powders consolidated by hot isostatic pressing (HIP) into the form of bar, rod, tubing, and shapes.
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Aluminum-Beryllium Alloy, Extrusions 38Al - 62Be Annealed

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS7912D
  • Current
Published 2018-12-28 by SAE International in United States
This specification covers an aluminum-beryllium alloy in the form of bars, rods, tubing, and shapes consolidated from powder by extrusion.
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