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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 (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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Appraisal of Tribo Meter Study on 20MnCr5 Alloy Steel under Case Hardened and Shot Peened Condition

Shanthi Gears Limited-Vignesh Nataraj
Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Janarthanan Prakash, Dinu Mathew
  • Technical Paper
  • 2019-28-0098
To be published on 2019-10-11 by SAE International in United States
This research is limited to study the strength and wear resistance of 20MnCr5 (SAE 5120) alloy steel under monolithic, case hardened and case hardened with shot peening processing condition. Improve the hardness of the material by enhancing the core and surface strength of case hardened with the shot peened sample. The main objective of this proposed work is to conduct the tribometer test by varying the load of 10, 20, 30 and 40N and sliding speed of 193, 386 rpm respectively on wear rate and coefficient of friction be calculated and recorded for this study. Less wear rate and nominal coefficient of friction were observed for case hardened with the shot peened sample. Load increases wear rate increases and the coefficient of friction decreases when sliding distance increases wear rate decreases and the coefficient of friction increases for all the tested samples due to oxide layer formation. After reaching certain load and sliding speed the curve goes linear because of more contact between pin and disc, so that mechanical amalgamation layer will be formed. On…
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Test Strip, Holder, and Gage for Shot Peening

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J442_201906
  • Current
Published 2019-06-06 by SAE International in United States
This SAE standard defines requirements for equipment and supplies to be used in measuring shot peening arc height and other surface enhancement processes. Guidelines for use of these items can be found in SAE J443 and SAE J2597.
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Ø SIZE CLASSIFICATION AND CHARACTERISTICS OF GLASS BEADS FOR PEENING

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J1173_201905
  • Current
Published 2019-05-03 by SAE International in United States
This specification covers the characteristics of glass beads used for peening, and provides for standard glass bead size numbers.
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High-Carbon Cast-Steel Grit

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J1993_201902
  • Current
Published 2019-02-21 by SAE International in United States
This SAE Recommended Practice describes the chemical composition, and physical characteristic requirements for high-carbon cast-steel grit, to be used for blast cleaning and etching operations.
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Flap Assemblies, Rotary Flap Peening

AMS B Finishes Processes and Fluids Committee
  • Aerospace Standard
  • AS2592A
  • Current
Published 2019-02-21 by SAE International in United States
This Aerospace Standard covers components of rotary flap assemblies to be used with portable equipment for peening of metal parts. The flap assemblies consist of a flap attached to a mandrel and shall be of the following sizes.
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Ultrasonically Activated Needle Peen Forming

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2588
  • Current
Published 2019-01-14 by SAE International in United States
This specification covers the equipment and process requirements for forming or straightening metal parts using Ultrasonically Activated Needle Peening.
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Laser Peening

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2546
  • Current
Published 2019-01-14 by SAE International in United States
This specification covers the requirements for computer controlled laser peening of metal part surfaces to induce residual compressive stresses at and beneath the surface.
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Peening Media Conditioned Carbon Steel Cut Wire Shot, High Hardness (55 to 62 HRC) (AWCH)

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2431/8C
  • Current
Published 2019-01-04 by SAE International in United States
This specification, in conjunction with the general requirements for peening media covered in AMS2431, establishes the requirements for the procurement of conditioned carbon steel cut wire shot with a hardness of 55 to 62 HRC.
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Rotary Flap Peening of Metal Parts

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2590B
  • Current
Published 2019-01-04 by SAE International in United States
This specification covers procedures and requirements for peening of metal parts with portable, bonded-shot, rotary flap assemblies in accordance with AS2592. The principles of rotary flap peening are similar to conventional shot peening, except conversion of arc height values using the magnetic Almen test strip holder is required for intensity determination.
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