Journal ArticleDOI
Residual stress distributions in a P91 steel-pipe girth weld before and after post weld heat treatment
TLDR
In this paper, the residual stresses in a pipe girth weld in a ferritic-martensitic power plant steel were measured by neutron diffraction and compared with the corresponding metallurgical zones in the weld region.Abstract:
In this study the residual stresses in a pipe girth weld in a ferritic-martensitic power plant steel were measured by neutron diffraction and compared with the corresponding metallurgical zones in the weld region. It was found that, in both the as-welded and post-weld heat treated condition, the highest tensile stresses resided near the outer boundary of the heat-affected zone (HAZ), and towards the weld root region. Substantial tensile direct and hydrostatic stresses existed across the HAZ, including the fine-grained and intercritically annealed regions, where premature type IV creep failures manifest in 9–12 Cr steel welds. Compressive stresses were found in the weld metal coinciding with the last weld bead to be deposited. Constrained cooling tests on test coupons illustrated that these compressive stresses can be explained in terms of the influence that solid-state phase transformations have on the accumulation of stress in welds.read more
Citations
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Journal ArticleDOI
Some studies on P91 steel and their weldments
TL;DR: In this article, microstructure evolution in P91 steel and their weldments are reviewed in as-virgin and heat treatment and creep exposure condition, and the role of grain coarsening, Cr/Fe ratio, lath widening and dislocation density on creep rupture life of base metal and weldments is discussed.
Journal ArticleDOI
Effect of normalizing temperature on microstructural stability and mechanical properties of creep strength enhanced ferritic P91 steel
TL;DR: In this article, the effect of solutionizing temperature on microstructure and mechanical properties of CSEF P91 steel has been investigated using optical metallography and scanning electron microscopy (SEM).
Journal ArticleDOI
Characterization of as-welded microstructure of heat-affected zone in modified 9Cr–1Mo–V–Nb steel weldment
TL;DR: In this paper, the non-equilibrium microstructure of the heat-affected zone (HAZ) in the as-welded modified 9Cr-1Mo-V-Nb pipe steel (P91) weldment was characterized by field-emission scanning electron microscope (FESEM) and electron backscatter diffraction (EBSD).
Journal ArticleDOI
Welding and weldability of candidate ferritic alloys for future advanced ultrasupercritical fossil power plants
TL;DR: In this article, a new class of ferritic alloys, known as creep strength enhanced ferritic steels, has been developed to meet the requirements of increasing the efficiency and reducing the carbon footprint of new and existing fossil fired power plants.
Journal ArticleDOI
Effect of Groove Design and Post-Weld Heat Treatment on Microstructure and Mechanical Properties of P91 Steel Weld
TL;DR: In this article, the effect of postwelding heat treatment (PWHT) and weld groove designs on the overall microstructure and mechanical properties of P91 steel pipe welds produced by the gas tungsten arc welding process was studied.
References
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Journal ArticleDOI
A profile refinement method for nuclear and magnetic structures
TL;DR: In this paper, a structure refinement method was described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram.
Journal ArticleDOI
Type IV cracking in ferritic power plant steels
TL;DR: In this paper, the authors assess the relationship between the composition and microstructure of 9-12 Cr steels, the welding and fabrication procedures and how these factors translate into a propensity for type IV failures.
Journal ArticleDOI
Prediction of welding residual stress in multi-pass butt-welded modified 9Cr–1Mo steel pipe considering phase transformation effects
Dean Deng,Hidekazu Murakawa +1 more
TL;DR: In this article, a thermal elastic plastic finite element model taking into account the metallurgical phase transformation was developed to investigate the influence of solid-state phase transformation on the evolution of residual stress distributions in butt-welded modified 9Cr-1Mo steel pipes.
Journal ArticleDOI
Evolution of dislocation density, size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600 °C for more than 100,000 h
Clara Panait,Clara Panait,Anna Zielińska-Lipiec,Tomasz Kozieł,Aleksandra Czyrska-Filemonowicz,Anne-Françoise Gourgues-Lorenzon,Walter Bendick +6 more
TL;DR: In this article, the authors present results of the quantitative measurement of the size of MX precipitates, subgrain size and dislocation density in a P91 steel that had been creep tested for 113,431 h at 600 ◦ C.
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Prediction of welding residual stress in multi-pass butt-welded modified 9Cr–1Mo steel pipe considering phase transformation effects
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