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Influence of Nickel and Manganese on Microstructure and Mechanical Properties of Shielded Metal Arc-Welded API-X80 Steel

  • Fariba Sheykh Jaberi
  • A. H. Kokabi
Article

Abstract

Microstructure developments of X80 weld metal by the addition of different amounts of alloying elements such as nickel and manganese to the covering of electrodes were investigated. For this reason, samples were welded with electrodes that Ni value has changed between 0.8 and 3.5% in two critical amounts of Mn 0.7 and 1.6. Optical microscopy and scanning electron microscopy were applied for peer investigation of microstructure. Different phase percentages were obtained by Clemex software and compared in all samples. Results indicated that Ni and Mn change weld microstructure in the as-deposited zone and reheated part and corresponding to each alloying element concentration, amount of acicular ferrite, as a determining factor for mechanical properties, were changed.

Keywords

acicular ferrite alloying elements API-X80 microstructure pipe line welding 

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Copyright information

© ASM International 2011

Authors and Affiliations

  1. 1.Department of Materials Engineering and ScienceSharif University of Technology (SUT)TehranIran

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