Journal ArticleDOI
Microstructural features of dissimilar welds between 316LN austenitic stainless steel and alloy 800
TLDR
In this article, the weld fusion zones and the interfaces with the base materials were characterised in detail using light and transmission electron microscopy, showing that the stainless steel weld metals solidified dendritically, while the 16-8-2 (16%Cr-8%Ni-2%Mo) weld metal showed a predominantly cellular substructure.Abstract:
For joining type 316LN austenitic stainless steel to modified 9Cr–1Mo steel for power plant application, a trimetallic configuration using an insert piece (such as alloy 800) of intermediate thermal coefficient of expansion (CTE) has been sometimes suggested for bridging the wide gap in CTE between the two steels. Two joints are thus involved and this paper is concerned with the weld between 316LN and alloy 800. These welds were produced using three types of filler materials: austenitic stainless steels corresponding to 316, 16Cr–8Ni–2Mo, and the nickel-base Inconel 182 1 . The weld fusion zones and the interfaces with the base materials were characterised in detail using light and transmission electron microscopy. The 316 and Inconel 182 weld metals solidified dendritically, while the 16–8–2 (16%Cr–8%Ni–2%Mo) weld metal showed a predominantly cellular substructure. The Inconel weld metal contained a large number of inclusions when deposited from flux-coated electrodes, but was relatively inclusion-free under inert gas-shielded welding. Long-term elevated-temperature aging of the weld metals resulted in embrittling sigma phase precipitation in the austenitic stainless steel weld metals, but the nickel-base welds showed no visible precipitation, demonstrating their superior metallurgical stability for high-temperature service.read more
Citations
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Journal ArticleDOI
Microstructural investigation and mechanical properties evaluation using miniature specimen testing of various constituents of dissimilar weld joint
Deepshree D. Awale,A.R. Ballal,M.M. Thawre,V.D. Vijayanand,V.D. Vijayanand,J. Ganesh Kumar,G.V. Prasad Reddy,G.V. Prasad Reddy +7 more
TL;DR: In this paper, microstructural evolution in P91 (modified 9Cr-1Mo) steel and 316LN Stainless Steel (SS) bi-metallic weld joints fabricated by arc welding technique using Inconel-182 electrode has been studied in as-welded and post weld heat treated (PWHT) conditions.
Journal ArticleDOI
Characterisation of thin section dissimilar weld joint comprising austenitic and ferritic stainless steels
TL;DR: In this article, an autogenous gas tungsten arc welding to produce a dissimilar weld comprising austenitic and ferritic stainless steels was attempted, and the pitting corrosion behaviour of the weld metal/heat affected zone, assessed as a 'composite zone', was found to be inferior to the rest of the regions in this dissimilar weldingment, in both the acidic and neutral chloride solutions of different concentrations.
Journal ArticleDOI
Avaliação da suscetibilidade à corrosão sob tensão da ZAC do aço inoxidável AISI 316L em ambiente de reator nuclear PWR
Mônica Maria de Abreu Mendonça Schvartzman,Marco Antônio Dutra Quinan,Wagner Reis da Costa Campos,Luciana Iglésias Lourenço Lima +3 more
TL;DR: In this article, a comparative study between the CST in the HAZ (Heat Affected Zone) of the AISI 316L in two different temperatures (303oC and 325oC) was performed using slow strain rate tensile (SSRT) test.
Book ChapterDOI
Hot Cracking Susceptibility: An Effect of Solidification Modes of SS Consumables During Bimetallic Welds
TL;DR: In this paper, the economical approach of using SS308L consumable against the costly Inconel consumables is investigated with SMAW and GMAW processes for fill pass welding.
Journal ArticleDOI
Comparative Studies on Metallurgical and Mechanical Properties of Bimetallic Combination on Incoloy 800 and SS 316L Fabricated by Gas Metal and Shield Metal Arc Welding
M. Manikandan,R. Gunachandran,M. Vigneshwaran,S. Sudhakar,A. Srikanth,M. Venkateshkannan,M. Arivarasu,N. Arivazhagan,Deva N. Rajan +8 more
TL;DR: In this article, the metallurgical and mechanical properties of bimetallic joints fabricated between nickel-based superalloy Incoloy 800 and stainless steel AISI 316L were investigated.
References
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Book
Welding Metallurgy of Stainless Steels
TL;DR: In this article, the importance of the Constitution diagram for the understanding of Welding Phenomena is discussed, and a detailed description of the Welding and post-weld surface treatment of Fabrications and Welded Components made from Austenitic Stainless Steels is given.
Journal ArticleDOI
A comparative evaluation of welding consumables for dissimilar welds between 316LN austenitic stainless steel and Alloy 800
TL;DR: In this article, a trimetallic joint involving modified 9Cr-1Mo steel and 316LN austenitic stainless steel as the base materials and Alloy 800 as the intermediate piece was investigated.
Journal ArticleDOI
Solidification Structures and Properties of Fusion Welds
G. J. Davies,J. G. Garland +1 more
TL;DR: In this paper, a wide range of fundamental knowledge of solidification processes is applied to the study of fusion-weld solidification, including inoculants, stimulated surface nucleation, dynamic grain refinement, and arc modulation.
Journal ArticleDOI
Investigation of boundaries and structures in dissimilar metal welds
TL;DR: In this paper, a ternary system composed of a pure iron substrate and a 70Ni-30Cu filler metal was used to determine the nature and evolution of boundaries and structure in dissimilar metal welds.
Journal ArticleDOI
Solidification sequences in stainless steel dissimilar alloy welds
TL;DR: In this article, a series of laser and gas tungsten arc welds traversing stainless steels of different chemical compositions has been studied, to elucidate the role of austenite or ferrite nucleation and cooling rate on solidification behaviour.