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

Vellore Institute of Technology-Nattudurai Navin Kumar, Aditya Chandrakant Yadav, 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…
 

Advances in Laser Welding of Stainless Steel Alloys

BSACIST-Varun Kumar Arulvizhi, Selvakumar Alandur Somasundaram, Mohammed Haareeskhan Niyaz, Pradeep Krishna Ranganathan, Afnan Zaid Moolai, Mohamed Ashfaq Ahmed Abdulla Burhanudeen, Mohan Raj Ramu
  • Technical Paper
  • 2019-28-0056
To be published on 2019-10-11 by SAE International in United States
As a fusion welding process, Laser welding has proven to be the most promising method for joining of different materials it can be either a similar or dissimilar material category. However, few complications still remain unanswered in joining of materials by laser process after successful implementation of laser’s by industries and also the commercial users in previous year’s such as workpiece preparation, fixture issues, atmospheric conditions, nozzle focus on the material, etc., This article will give an elaborate survey on joining of stainless steel alloys, though there are many factors to be considered in a survey article here we concentrated on the metallurgical behaviour and tensile properties of weldments joined by laser welding technique, because the main criteria for a weldment is to have a coarse grain boundary distribution which may be distorted due to high heat generation during a joining process and to possess good tensile strength in order to withstand the impacts given on the weldment when it is being practically deployed in usage. The material behavior of weldment is primarily based on…
 

Improving Competitiveness of Additive Manufacturing Aerospace Serial Parts

LISI Aerospace-Maxime Gas, Alexis Rene-Corail, Sebastien Eyrignoux, Guillaume Iker, Stephane Sudre
  • Technical Paper
  • 2019-01-1900
To be published on 2019-09-16 by SAE International in United States
The interest of selective laser melting technology for aerospace parts is very high due to their high complexity and their freedom of design which allow functions integration. However, the competitiveness of Laser Beam Melting (LBM) machines for aerospace industry is limited by two major road blocks. On the one hand, basic parametric set sold with LBM machines are more oriented to historical qualification than productivity rates. For instance, the ongoing qualification on EOS M290 by AIRBUS COMMERCIAL AIRCRAFT only enables us to produce a hundred pieces per machine per year. On the other hand, wasted times between two consecutive manufacturing batches are significant and are impacting the yearly output of the machines. The present project focuses on two activities, focusing on the largest available machines, XLINE2000R and M400, in order to maximize the amount of pieces per build. The first one was the improvement of parametric set productivity, to reduce production time, while keeping material and mechanical properties. We focused on main aerospace materials: titanium alloys, aluminum alloys (Scalmalloy®) and nickel-chromium-based superalloys. The second one…
 

Laser Diode Based on Organic Semiconductors

  • Magazine Article
  • TBMG-34801
Published 2019-07-01 by Tech Briefs Media Group in United States

Researchers have demonstrated that a long-elusive kind of laser diode based on organic semiconductors is indeed possible, paving the way for the further expansion of lasers in applications such as biosensing, displays, healthcare, and optical communications.

 

The Rodney Dangerfield of Automated-Driving Sensors

Autonomous Vehicle Engineering: July 2019

Bradley Berman
  • Magazine Article
  • 19AVEP07_06
Published 2019-07-01 by SAE International in United States

Radar and lidar get all the attention, but Inertial Measurement Units are the backbone of sensor fusion. Suppliers are scrambling to make IMUs more accurate-and much less expensive.

The emerging era of highly-automated driving comes courtesy of much-vaunted sensor technology-spinning lasers, penetrating radar, sonar blips. But the sensor that gets the least respect in the technology stack could be the lynchpin for the mass roll-out of self-driving vehicles: the inertial measurement unit (IMU).

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The Influence of SLD Drop Size Distributions on Ice Accretion in the NASA Icing Research Tunnel

NASA John Glenn Research Center-Mark G. Potapczuk
Ohio Aerospace Institute-Jen-Ching Tsao
Published 2019-06-10 by SAE International in United States
An ice shape database has been created to document ice accretions on a 21-inch chord NACA0012 model and a 72-inch chord NACA 23012 airfoil model resulting from an exposure to a Supercooled Large Drop (SLD) icing cloud with a bimodal drop size distribution. The ice shapes created were documented with photographs, laser scanned surface measurements over a section of the model span, and measurement of the ice mass over the same section of each accretion. The icing conditions used in the test matrix were based upon previously used conditions on the same models but with an alternate approach to evaluation of drop distribution effects. Ice shapes resulting from the bimodal distribution as well as from equivalent monomodal drop size distributions were obtained and compared. Results indicate that the ice shapes resulting from the monomodal and bimodal drop size distributions had similar shapes, but the bimodal distributions had greater mass and volume measurements and icing limits that extended further back on the chord of the model.
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Matrix-Free Assisted Laser Desorption Ionization Using Metal-Organic Frameworks

  • Magazine Article
  • TBMG-34534
Published 2019-06-01 by Tech Briefs Media Group in United States

Matrix-assisted laser desorption/ionization (MALDI) is a soft ionization technique that is widely applied in the characterization of large biomolecules using various mass spectrometry (MS) analyzers, specifically, time-of-flight (TOF) analyzers. The MALDI process involves the deposition of an analyte solution onto a metal substrate before the addition of a matrix. The matrix/analyte dry spot is exposed to a UV laser, and the laser energy that is absorbed by the matrix/analyte is converted into heat energy that initiates charge transfer, which results in the desorption of the matrix and analyte molecules in ionized form. The positive ions are then accelerated through a vacuum into MS analyses.

 

Using Laser Metal Printing to Cool Computer Chips

  • Magazine Article
  • TBMG-34595
Published 2019-06-01 by Tech Briefs Media Group in United States

Traditionally, electronics are cooled using a heat sink that transfers the heat generated by the electronic system into the air or a liquid coolant. For the heat sink to work, it has to be attached to the CPU or the graphics processor via a thermal interface material such as thermal paste. It helps facilitate the transfer of heat by bridging microscopic gaps between the heat sink and the chip.

 

Cross-Training Made Possible by Common Control Platform

  • Magazine Article
  • TBMG-34579
Published 2019-06-01 by Tech Briefs Media Group in United States

EMAG L.L.C. is the U.S. subsidiary of a major German machine tool builder that specializes in machine tools for the production of automotive, off-highway, agricultural, and oil field components. The company’s equipment ranges from basic round part turning centers to large-workpiece, five-axis machining centers; gear hobbing machines; and alternative equipment such as laser welding and electrochemical machining centers. This wide variety of machine tools requires an assortment of control technologies to power and manage the motion. For one customer requirement where a major agricultural equipment builder needed grinding, turning, and turn-grind machines, EMAG looked to Siemens for a standardized CNC solution.

 

Aerospace & Defense Technology: June 2019

  • Magazine Issue
  • 19AERP06
Published 2019-06-01 by SAE International in United States
Eyes in the Sky Rugged High-Speed Cameras Capture Critical Flight Test Video DataPanoramic Thermal Imaging Technology A New Concept in Naval DefenseCoating Technology Enables Effective Missile CountermeasuresFACE™ - Future Airborne Capability Environment Diminishing U.S. Combat Superiority Drives New Software Development RequirementsBroadband 1.2- and 2.4-mm Gallium Nitride (GaN) Power Amplifier DesignsMulti-Agent RF Propagation SimulatorElectrical Characterization of Crystalline UO2, THO2 and U0.71TH0.29O2 Evaluating the suitability of advanced alloys for use in uranium-based neutron detectors.ONR Short Pulse Research, Evaluation and non-SWaP Demonstration for C-sUAV Study Research project is designed to map small unmanned aerial vehicle (sUAV) effects space, empirically and by simulation, as a function of high power microwave (HPM) waveform to develop effective countermeasures.Matrix-Free Assisted Laser Desorption Ionization Using Metal-Organic FrameworksMachining Titanium Aero-FramesGetting the Most Out of Industrial CT Scanning Industrial CT analysis software uncovers aerospace manufacturing defects that scanning alone might miss.Aerospace Work Platforms - More than Meets the Eye Today's work platforms are far more complex than the simple designs of the past.