Journal ArticleDOI
Microstructure and Mechanical Properties of Weld Fusion Zones in Modified 9Cr-1Mo Steel
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TLDR
In this article, a plate of modified 9Cr-1Mo steel was welded with three different filler materials: standard 9Cr 1Mo, modified 9 Cr 1Mo and nickel-base alloy Inconel 182 post-weld heat treatment (PWHT) for periods of 2 and 6 hours.Abstract:
Modified 9Cr-1Mo steel finds increasing application in power plant construction because of its excellent high-temperature properties While it has been shown to be weldable and resistant to all types of cracking in the weld metal and heat-affected zone (HAZ), the achievement of optimum weld metal properties has often caused concern The design of appropriate welding consumables is important in this regard In the present work, plates of modified 9Cr-1Mo steel were welded with three different filler materials: standard 9Cr-1Mo steel, modified 9Cr-1Mo, and nickel-base alloy Inconel 182 Post-weld heat treatment (PWHT) was carried out at 730 and 760 °C for periods of 2 and 6 h The joints were characterized in detail by metallography Hardness, tensile properties, and Charpy toughness were evaluated Among the three filler materials used, although Inconel 182 resulted in high weld metal toughness, the strength properties were too low Between modified and standard 9Cr-1Mo, the former led to superior hardness and strength in all conditions However, with modified 9Cr-1Mo, fusion zone toughness was low and an acceptable value could be obtained only after PWHT for 6 h at 760 °C The relatively poor toughness was correlated to the occurrence of local regions of untransformed ferrite in the microstructureread more
Citations
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Journal ArticleDOI
Effect of change in microstructures due to simulation temperatures on the low cycle fatigue behavior of P91 steel
TL;DR: In this article, the microstructures of the three principal heat-affected zones (HAZs) of the P91 steel weld joint were simulated using appropriate heat treatments at different soaking temperatures ranging from 865°C to 1200°C.
Dissertation
Investigating chemical and microstructural evolution at dissimilar metal welds
TL;DR: In this paper, the chemical and microstructural stability of a range of DMWs involving P91 and P92 steels was investigated using a 3-bead manual metal arc weld on a P92 substrate.
Dissertation
High temperature nanoindentation characterisation of P91 and P92 steel
TL;DR: In this article, the authors examined the relationship between nanoindentation measurements on bulk materials and those obtained using conventional methods such as Vicker's hardness testing and uniaxial tensile testing.
Journal ArticleDOI
A review of effect of welding and post weld heat treatment on microstructure and mechanical properties of grade 91 steel
TL;DR: In this paper, the effect of different welding process, type of filler wire, its chemical composition and type of flux is discussed in this paper and major focus is given on hardness, creep resistance and notch toughness.
References
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Journal ArticleDOI
Microstructural evolution of modified 9Cr-1Mo steel
TL;DR: In this article, the authors investigated the influence of trace amounts of V and Nb on the sequence of precipitation processes and identified the basis for the enhanced high-temperature strength compared to the standard 9Cr-lMo composition.
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
Study of creep rupture strength in heat affected zone of 9Cr‐1Mo‐V‐Nb‐N steel by welding thermal cycle simulation
TL;DR: In this paper, the authors describe an investigation of the creep rupture strength (CRS) of 9Cr•1Mo•V•Nb•N steel welded joints by welding thermal cycle simulation.
Journal ArticleDOI
Weldability of 9Cr‐1Mo‐Nb, V P91 steel intended for service in the power industry
J Brozda,Marian Zeman +1 more
TL;DR: In this paper, the authors describe the Weldability of 9Cr•1Mo•Nb, V P91 steel intended for service in the power industry and show that it can be used in a number of applications.