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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
Published 2019-10-11 by SAE International in United States
In Additive manufacturing, Direct Metal Laser Sintering (DMLS) is a rapid manufacturing technique used for manufacturing of functional component. Finely powered metal is melted by using high-energy fiber laser, by Island principle strategy that produces mechanically and thermally stable metallic component with reduced stresses, thermal gradients and at high precision. Inconel is an austenitic chromium nickel-based superalloy often used in the applications which require high strength and temperature resistant. It can retain its properties at high temperature. An attempt is made to examine the effect of laser shot peening (LSP) on DMLS Inconel 718 sample. Microstructure shows elliptical shaped structure and formation of new grain boundaries. The surface roughness of the material has been increased due to the effect of laser shock pulse and ablative nature. Macro hardness increased to 13% on the surface. Depth wise microhardness was investigated, found to be 17% increase on the sub-layer of the material due to the effect of a hardened matrix formed by precipitation hardening and grain size refinement attributed by laser shock peening. SEM analysis shows larger…
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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
Published 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 is mainly used in aerospace, defense 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, a study is carried out on 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 and scanning electron microscope. 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 cryogenic treatment, the hardness of Inconel 718 has been substantially improved at room temperature. Microstructure shows grains in one of the test condition, a larger number of refined…
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Surface Modification of Aluminium Alloy 5083 Reinforced with Cr2O3/TiO2 by Friction Stir Process

Bannari Amman Institute of Technology-Dinesh Dhanabalan
Vellore Institute of Technology-Adarsh Singh, Govindasamy Rajamurugan, Prabu Krishnasamy
  • Technical Paper
  • 2019-28-0179
Published 2019-10-11 by SAE International in United States
The surface properties have a vital role in the overall performance of the parts like brake shoe pad and other frame system. The mechanical and residual stress measurements of aluminium alloy 5083 were investigated on friction stir processed plates using the reinforcements of chromium oxide (Cr2O3) and titanium dioxide (TiO2) separately as well as combination of these powders. A comparative study was made to analyze the effects of reinforcements, tool type (cylindrical and threaded), parameters and the volume fraction of the reinforcements. The mechanical properties such as surface hardness and residual stress of the friction stir processed specimens were investigated. The experimental results shows that there was a significant increase in surface hardness (118 HRC) as well as a decrease in residual stress compare to the base metal. This study also reveals that the threaded tool with a reinforcement of Cr2O3 and TiO2 reflected better mechanical properties than the cylindrical tool. The SEM images show that the uniform distribution of reinforcement in the processed zone. The surface-hardened plates can be used in brake shoe pad…
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The Challenge of Replacing Hard Chrome

Aerospace & Defense Technology: October 2019

  • Magazine Article
  • 19AERP10_03
Published 2019-10-01 by SAE International in United States

The search for a suitable replacement for hard chrome on aerospace components has been a key supply chain priority for aircraft manufacturers. This is because of the documented health risks to workers and the impact on the environment from exposure to hexavalent chromium, a carcinogen that occurs during the chrome plating process and is the most toxic form of chromium.

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Inspection of Ground, Chromium, Plated Steel Parts

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2440C
  • Current
Published 2019-07-18 by SAE International in United States

This specification covers the requirements for inspection of ground chromium plated surfaces for grinder-induced damage to the chromium plate and substructure. The specification also provides users with criteria for distinguishing between such damage and acceptable indications inherent to the chromium plate.

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Steel, Carburizing Grade, Bars, Forgings, and Tubing 1.2Cr - 3.2Ni - 0.12Mo (0.14 - 0.20C) (9317)

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6264M
  • Current
Published 2019-06-17 by SAE International in United States
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
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Aluminum Alloy, Plate 3.5Cu - 1.0Li - 0.40Mg - 0.35Mn - 0.45Ag - 0.12Zr (2050-T84) Solution Heat Treated, Stress Relieved, and Artificially Aged

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4413B
  • Current
Published 2019-05-10 by SAE International in United States
This specification covers an aluminum-lithium alloy in the form of plate 0.500 to 6.500 inch (12.70 to 165.10 mm) inclusive, in thickness (see 8.5).
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Steel, Welding Wire 0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.33 - 0.38C)(4335 Mod) Vacuum Melted, Environment Controlled Packaging

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS5029E
  • Current
Published 2019-04-02 by SAE International in United States
This specification covers a low-alloy steel in the form of welding wire.
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CRIMPING TOOL AND ACCESSORIES, DIES, WIRE SIZE 8 TO 0000 UN-INSULATED AND INSULATED CRIMP BARRELS

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS5259/7B
  • Current
Published 2019-03-15 by SAE International in United States
No Abstract Available.
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Friction Coefficient Identification and Environmental Marking System for Brake Linings

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J866_201903
  • Current
Published 2019-03-11 by SAE International in United States
This SAE Recommended Practice is intended to provide a uniform means of identification which may be used to classify the friction coefficient of brake linings, based on data obtained from tests conducted in accordance with SAE J661 Brake Lining Quality Test Procedure and SAE J2975 Measurement of Copper and other elements in Brake Friction Materials. NOTE: It is emphasized that this document does not establish friction requirements for brake linings, nor does it designate significant characteristics of brake linings which must be considered in overall brake performance. Due to other factors that include brake system design and operating environment, the friction codes obtained from this document cannot reliably be used to predict brake system performance.
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