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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Evolution of microstructure in reheated coarse-grained zone of G115 novel martensitic heat-resistant steel
TL;DR: In this article, the effect of welding peak temperature and cooling time on microstructure, precipitates, substructure and microhardness of the reheated coarse-grained heat-affected zone (CGHAZ) of G115 novel martensitic heat-resistant steel was analyzed.
Journal ArticleDOI
In Situ Tensile Deformation and Residual Stress Measurement by Neutron Diffraction in Modified 9Cr-1Mo Steel
TL;DR: In this paper, the deformation behavior of 9Cr-1Mo (Grade 91) steel during uniaxial tensile loading was studied using the in situ neutron diffraction technique.
Journal ArticleDOI
Microstructure Evolution and Mechanical Behaviour of SAW Weldments of CSEF Steel on Preheating and PWHT
TL;DR: In this paper, double-sided submerged-arc-welded CSEF steel joints were considered for microstructural and mechanical characterisations for four different cases of preheating and PWHT processes.
Journal ArticleDOI
Comparative evaluation of creep response of X20 and P91 steam piping networks in operation
TL;DR: In this article, the authors compared the creep behaviour of X20 CrMoV12-1 and P91 (9Cr-1Mo) steam piping networks subjected to typical operating condition.
Journal ArticleDOI
Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment
K. Abburi Venkata,Saber Khayatzadeh,A. Achouri,J. Araújo de Oliveira,A. N. Forsey,S. Gungor,P. J. Bouchard,C. E. Truman +7 more
TL;DR: In this article, a dissimilar weld between modified 9Cr-1Mo steel and austenitic stainless steel AISI 316LN was made using autogenous electron beam welding.
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.