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In the present study a single wall of Inconel 625 alloy fabricated using Cold Metal Transfer (CMT) Wire Arc Additive Manufacturing (WAAM) has been investigated. This study is based on the location dependent microstructure and mechanical properties of the fabricated Inconel 625 alloy. Microstructural studies revealed variation in microstructure in different region of the deposited bead depending on the thermal gradient which consist of fine cellular dendrites, columnar secondary arm dendrites and equiaxed fine dendrites. It was found that the as-deposited alloy shows the presence of intermetallic secondary phases such as the Laves phase, NbC and carbides were observed in the gamma-nickel matrix. Mechanical properties such as micro-hardness and tensile strength are also investigated. The average microhardness values along the build direction of deposited Inconel 625 wall varies from 270 to 240 HV. The ultimate tensile strength (UTS) varies in the range of 730 MPa to 685 MPa, while yield strength (YS) varies in the range of 400 MPa to 425 MPa. The tensile specimens collected from the bottom of the bead close to the substrate showed better mechanical property compare to those collected from the top region of the wall.

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Microstructure and Mechanical Properties of Wire Arc Additively Manufactured Inconel 625 Superalloy

  • 会议论文

  • 发表日期：

    2025年

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  • Rajnish Mishra,
  • Murshid Imam,
  • Vishwanath Chinthapenta,
  • P. Mastanaiah

摘要

In the present study a single wall of Inconel 625 alloy fabricated using Cold Metal Transfer (CMT) Wire Arc Additive Manufacturing (WAAM) has been investigated. This study is based on the location dependent microstructure and mechanical properties of the fabricated Inconel 625 alloy. Microstructural studies revealed variation in microstructure in different region of the deposited bead depending on the thermal gradient which consist of fine cellular dendrites, columnar secondary arm dendrites and equiaxed fine dendrites. It was found that the as-deposited alloy shows the presence of intermetallic secondary phases such as the Laves phase, NbC and carbides were observed in the gamma-nickel matrix. Mechanical properties such as micro-hardness and tensile strength are also investigated. The average microhardness values along the build direction of deposited Inconel 625 wall varies from 270 to 240 HV. The ultimate tensile strength (UTS) varies in the range of 730 MPa to 685 MPa, while yield strength (YS) varies in the range of 400 MPa to 425 MPa. The tensile specimens collected from the bottom of the bead close to the substrate showed better mechanical property compare to those collected from the top region of the wall.