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Evaluation of Microstructure at Interfaces of Welded Joint Between Low Alloy Steel and Stainless Steel

  • K. Ravikiran
  • G. Das
  • Suranjit Kumar
  • P. K. Singh
  • K. Sivaprasad
  • M. GhoshEmail author
Article
  • 73 Downloads

Abstract

In the present investigation, welded joints between low alloy steel and 304LN stainless steel were considered. The joints were fabricated using Inconel 152 and 182 as buttering materials. A thin layer of martensite, Type-I boundary, and Type-II boundary were revealed near the fusion boundary between low alloy steel and the buttering material. The polygonal grain structure and unmixed zone were found near the fusion boundary between the weld metal and austenitic stainless steel. During a uniaxial in situ deformation test in an SEM, it was revealed that crack initiation and propagation were through the buttering material. In this respect, the weld fabricated with the Inconel 152 buttering material exhibited better joint efficiency and a higher strain-hardening exponent than the joint produced with the Inconel 182 buttering material. The improved strength of the former joint was attributed to a fine grain structure, fine-scale distribution of complex carbide phases, and qualitatively high dislocation density within the Inconel 152 buttering material.

Notes

Acknowledgments

The authors are grateful to the director, CSIR-NML, for providing permission to use the infrastructural facilities to carry out the investigation. One of the authors thanks the professors at the National Institute of Technology, Tiruchirappalli, for their valuable suggestions.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • K. Ravikiran
    • 1
  • G. Das
    • 2
  • Suranjit Kumar
    • 3
  • P. K. Singh
    • 3
  • K. Sivaprasad
    • 4
  • M. Ghosh
    • 2
    Email author
  1. 1.Advanced Materials Processing Laboratory, Department of Metallurgical and Materials EngineeringNational Institute of TechnologyTiruchirappalliIndia
  2. 2.Material Engineering DivisionCSIR-National Metallurgical LaboratoryJamshedpurIndia
  3. 3.Reactor Safety DivisionBhaba Atomic Research CentreMumbaiIndia
  4. 4.Department of Metallurgical and Materials EngineeringNational Institute of TechnologyTiruchirappalliIndia

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