Tensile properties of shielded metal arc welded dissimilar joints of nuclear grade ferritic steel and austenitic stainless steel

Journal of the Mechanical Behavior of Materials

Malarvizhi S.¹  Karthick K.¹  Balasubramanian V.¹  Krishnan S.A.²  Sasikala G.³  Albert Shaju K.³ 

[1] Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar – 608 002, Tamil Nadu, India;Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam – 603 102, Tamil Nadu, India;Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam – 603 102, Tamil Nadu, India;

关键词: austenitic stainless steel;    dissimilar joint;    ferritic steel;    impact toughness;    shielded metal arc welding;    tensile properties;   

DOI  :  10.1515/jmbm-2017-0005

来源: DOAJ

【 摘 要 】

In nuclear power plants, modified 9Cr-1Mo ferritic steel (Grade 91 or P91) is used for constructing steam generators (SG’s) whereas austenitic stainless steel (AISI 316LN) is a major structural member for intermediate heat exchanger (IHX). Therefore, a dissimilar joint between these materials is unavoidable. In this investigation, dissimilar joints were fabricated by Shielded Metal Arc Welding (SMAW) process with Inconel 82/182 filler metals. Transverse tensile properties and Charpy V-notch impact toughness for different regions of dissimilar joints of modified 9Cr-1Mo ferritic steel and AISI 316LN austenitic stainless steel were evaluated as per the standards. Microhardness distribution across the dissimilar joint was recorded. Microstructural features of different regions were characterized by optical and scanning electron microscopy. The transverse tensile properties of the joint is found to be inferior to base metals. Impact toughness values of different regions of dissimilar metal weld joint (DMWJ) is slightly higher than the prescribed value. Formation of a soft zone at the outer edge of the HAZ will reduce the tensile properties of DMWJ. The complex microstructure developed at the interfaces of DMWJ will reduce the impact toughness values.

【 授权许可】

Unknown