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research-article

A-TIG and GTA welding of dissimilar P91 and P92 steels

[+] Author and Article Information
Chandan Pandey

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand-247667, India
chandanpy.1989@gmail.com

Manas Mohan Mahapatra

School of Mechanical Sciences, Indian Institute of Technology, Bhubaneswar, Odisha 751013, India
mansfme@gmail.com

Pradeep Kumar

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand-247667, India
kumarfme@gmail.com

Nitin Saini

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand-247667, India
nit030078@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4039127 History: Received October 12, 2017; Revised January 12, 2018

Abstract

Creep strength ferritic/martensitic modified 9Cr-1Mo (P91) also designated as ASTM A335 used for out-of-core and in-core (piping, cladding, ducts, wrappers, and pressure vessel) of Gen IV reactors. In present investigation, a comparative study on effect of autogenous tungsten inert gas welding (A-TIG) with double pass and multi-pass gas tungsten arc (GTA) welding on microstructure evolution in weld zone and mechanical properties of P91 and P92 steel welded joints were carried out. The microstructure evolution was studied in as-welded and post-weld heat treatment (PWHT) condition. The study also focused on the evolution of d-ferrite patches and their influence on the tensile properties of welded joints. PWHT was carried out at 760 oC for varying time of 2 to 6 h. To study the effect of d-ferrite evolution on mechanical properties, Charpy toughness, microhardness and tensile tests were performed.

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