Mechanical Behavior of Armor Steel Gas Metal Arc Welding Joints Performed by Nickel-Chromium and Low-Alloy Steel Filler Metals

R. Serrano, R. R. Ambriz, G. Ayoub, D. Jaramillo

Research output: Contribution to journalArticlepeer-review

Abstract

The objective of this work is to improve the mechanical properties of armor steel welded joints by manufacturing dissimilar joints using a nickel-iron-chromium filler material. This work analyzes the hardness, tensile strength, impact resistance, and high-cycle fatigue behavior of an armor Cr-Mn steel, welded with the gas metal arc welding process. In the purpose of evaluating the advantage of dissimilar joints, the armor Cr-Mn steel was welded using two different filler materials: a commonly used filler material, ER70S-6, and a nickel-iron-chromium filler material, ERNiFeCr-2. The microstructural characteristics of the welded joints were analyzed and discussed. The ERNiFeCr-2 welds presented an increase in yield stress (20%), ultimate tensile stress (30%), and impact resistance (16%) in comparison with the ER70S-6 joints. However, an approximately 50% ductility decrease was also reported. It is argued that the superior strength and limited ductility of the ERNiFeCr-2 welds was attributed to the presence of carbides in the austenitic matrix of the weld metal. In terms of fatigue performance, both welded joints presented similar behavior.

Original languageEnglish
JournalJournal of Materials Engineering and Performance
DOIs
StateAccepted/In press - 2022

Keywords

  • armor steel
  • dissimilar weld
  • HSLA steel
  • mechanical behavior
  • nickel-based alloy

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