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
Investigation of weld defects, microstructural, and mechanical features of TWIP and austenitic stainless steel dissimilar joints by pulsed GTAW process
O. D. Frasco-García,V. García-García,F. Reyes-Calderón,Orlando Hernández-Cristóbal,P. Garnica-González +4 more
Development of dissimilar GTA 4130/201 SS weld joint and investigation on the effect of filler metals in order to obtain improved mechanical properties and microstructural features
TL;DR: In this article, gas tungsten arc welding of dissimilar joint between 4130 low alloy steel and AISI 201 austenitic stainless steel was investigated, and microstructural features of various areas and also fracture surfaces were examined using optical microscopy and scanning electron microscopy.
ReportDOI
Novel Dissimilar Joints Between Alloy 800H and 2.25%Cr and 1%Mo Steel
TL;DR: In this article, the authors used additive manufacturing (AM) technologies as a highly controllable means for reducing carbon migration through theoretically designed, compositionally graded transition joints guided by appropriate thermodynamic, kinetic and heat transfer and fluid flow modeling.
Journal ArticleDOI
Microstructure and hardness profile of dissimilar lap joint of type 304 stainless steel to ss400 carbon steel
Herry Oktadinata,Adi Ganda Putra +1 more
TL;DR: In this article, the effect of filler metal and shielding gas on the microstructure and hardness of dissimilar lap joint of type 304 austenitic stainless steel to JIS SS400 low carbon steel was investigated.
Book ChapterDOI
Mechanical Evaluation of IN718-AL6XN Dissimilar Weldment
TL;DR: In this article, gas tungsten arc welding (GTAW) was used to join Inconel 718 and AL6XN plates and the results showed that the mechanical properties of as-welded and hardening recovery provided by post weld heat treatment (HRPWHT) conditions are close.
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.