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Interface Analysis between Inconel 625 and Cobalt-Chromium Alloy Fabricated by Powder Bed Fusion Using Pulsed Wave

Liming Yao1, Aditya Ramesh1, Zongheng Fan1

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Materials (Basel, Switzerland)
|October 14, 2023
PubMed
Summary
This summary is machine-generated.

Laser powder bed fusion (LPBF) enhances corrosion resistance by depositing CoCrMo on IN625. Optimal laser energy density (E_V > 38) maximizes strength and strain in dissimilar metal parts.

Keywords:
Pulsed Wave Laseradditive manufacturingdissimilar alloyinterface strength

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Corrosion Engineering

Background:

  • Components in aerospace and petrochemical industries face harsh, high-temperature corrosive environments.
  • Enhanced corrosion resistance is crucial for component longevity, often achieved through specialized materials or processes like coating and welding.

Purpose of the Study:

  • To investigate the application of laser powder bed fusion (LPBF) for creating corrosion-resistant dissimilar metal parts.
  • To optimize the LPBF process for depositing a CoCrMo layer on an IN625 substrate for improved valve component performance.

Main Methods:

  • Utilized laser powder bed fusion (LPBF) technology.
  • Deposited a 5 mm thick corrosion-resistant Cobalt-Chromium-Molybdenum (CoCrMo) layer onto a high-strength Inconel 625 (IN625) substrate.
  • Analyzed the effect of laser volumetric energy density (E_V) on tensile strength, fracture position, and strain.

Main Results:

  • Tensile strength increased linearly with E_V up to 20 (slope ~85°), reaching maximum strength at E_V > 20.
  • Fracture location shifted from CoCrMo to IN625 as E_V increased from 0 to 20.
  • Strain increased linearly with E_V up to 38 (slope ~67.5°), achieving maximum strain at E_V > 38.

Conclusions:

  • An optimal laser volumetric energy density (E_V) greater than 38 is required for superior sample strength and strain.
  • LPBF technology offers a viable method for manufacturing corrosion-resistant dissimilar metal components.
  • The study provides foundational data for LPBF applications in demanding industrial environments.