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
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Dissertation
Through-thickness microstructure and mechanical properties of electron beam similar welded AISI 316L stainless steel and dissimilar welded AISI 316L / Ti6Al4V
TL;DR: In this paper, a defect-free electron beam welded 20 mm thick AISI 316L austenitic stainless steel has been investigated as a function of beam power, and the weld microstructure is characterised by a columnar and equiaxed dendritic ferrite in an austenite matrix.
Journal ArticleDOI
Laser Weld-Induced Formation of Amorphous Mn–Si Precipitate in 304 Stainless Steel
TL;DR: In this article, the formation of partially amorphous Mn-Si precipitates due to laser welding of face centered cubic (fcc) 304 stainless steel has been reported, and it is surmised that the rapid cooling rates during the laser weld melt pool solidification process may be sufficient to inhibit the complete crystallization of these precipitates.
Effect of strength mismatch on fracture behavior of ferrite-austenite interface in Ni-base alloy dissimilar metal welds
TL;DR: Sarikka et al. as mentioned in this paper determined the microstructural properties, mechanical properties, and mechanical mismatch across a ferriticaustenitic interface of a traditional V-groove DMW and a modern NG DMW using tensile testing and microhardness and nanoindentation testing.
Journal ArticleDOI
Microstructural evolution and examination of α'-martensite during a multi-pass dissimilar stainless steel GTAW process
TL;DR: In this paper, the microstructural evolution and examination of α'-martensite in fusion zones and heat-affected zones under multi-pass dissimilar stainless steels welding were discussed.
Journal ArticleDOI
Effect of Shielding Gas and Filler Metal to Microstructure of Dissimilar Welded Joint Between Austenitic Stainless Steel and Low Carbon Steel
Dewin Purnama,Herry Oktadinata +1 more
TL;DR: In this paper, a study on dissimilar metal weld between type 304 stainless steel and SS400 carbon steel is presented, in which the steel plates were welded by using different filler metals (solid wire, flux-cored wire) and different shielding gases (100%CO2, 90%Ar+10% CO2), and the weldments were observed by optical microscope, scanning electron microscope and EDX analysis.
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.