Journal ArticleDOI
Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds
TLDR
In this article, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of duplex stainless steels with and without nickel enhancement.Abstract:
The excellent combination of strength and corrosion resistance in duplex stainless steels (DSS) is due to their strict composition control and microstructural balance. The ferrite–austenite ratio is often upset in DSS weld metals owing to the rapid cooling rates associated with welding. To achieve the desired ferrite–austenite balance and hence properties, either the weld metal composition and/or the heat input is controlled. In the current work, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of DSS with and without nickel enhancement. Results show that (i) chemical composition has got a greater influence on the ferrite–austenite ratio than the cooling rate, (ii) and even EBW which is considered an immature process in welding of DSS, can be employed provided means of filler addition could be devised.read more
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Nonhomogeneous microstructure formation and its role on tensile and fatigue performance of duplex stainless steel 2205 multi-pass weld joints
TL;DR: In this article, the microstructure characteristics and formation mechanism of DSS (duplex stainless steel) multi-pass weld joints were firstly investigated in terms of the OM (optical microscope) and EBSD (electron back-scattered diffraction) observation, and a series mechanical tests, including the monotonic tensile tests assisted by the DIC (digital image correlation) observation and stress-controlled fatigue tests, were subsequently performed to clarify the intrinsic correlation between mechanical behavior and micro-structure.
Journal ArticleDOI
Microstructure evolution and mechanical performance of underwater local dry welded DSS metals at various simulated water depths
TL;DR: In this article, phase balance, interface boundaries, and grain types were characterized in local dry underwater welded DSS metals, and the results showed that the austenite content of the weld metals decreased first, then increased and then decreased with the increase in the simulated water depth from 0.1m to 75m.
Journal ArticleDOI
Effects of preheating temperature on cold cracks, microstructures and properties of high power laser hybrid welded 10Ni3CrMoV steel
TL;DR: In this article, a Y-groove cold cracking test adapted to laser hybrid welding is designed to assess the weldability of 10Ni3CrMoV steels at room temperature and different preheating temperatures.
Journal ArticleDOI
Microstructural and mechanical characterisation of laser-welded high-carbon and stainless steel
TL;DR: In this paper, a scientific investigation on controlling the brittle phase formation during laser dissimilar welding of high-carbon steel to stainless steel was conducted, and a new heat treatment strategy was proposed and evaluated using a finite element analysis-based numerical simulation model.
Journal ArticleDOI
Microstructural evolution of transition zone of clad X70 with duplex stainless steel
TL;DR: In this paper, the microstructural evolution of the transition zone of clad X70 with duplex stainless steel 2209 by hot-wire tungsten inert gas (TIG) welding was examined with an optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscopy (TEM).
References
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Duplex stainless steels : microstructure, properties and applications
TL;DR: In this paper, the authors present a non-destructive testing of welds for service experience, based on the application of service experience in metallurgy and metallurgical applications.