Results 261 to 270 of about 350,048 (296)

A Quantitative Assessment of Microstructural Evolution for Grade 91

Volume 6A: Materials and Fabrication, 2018
China has the most supercritical boilers in the world. Grade 91 steels are widely used for high temperature components of supercritical boiler. During high temperature service, microstructural evolution of Grade 91 steel may affect the mechanical properties, including creep strength.
Chang Che, Gong Qian, Xisheng Yang
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Evaluation of the creep cavitation behavior in Grade 91 steels

International Journal of Pressure Vessels and Piping, 2016
Abstract Even in properly processed Grade 91 steel, the long term performance and creep rupture strength of base metal is below that predicted from a simple extrapolation of short term data. One of the mechanisms responsible for this reduction in strength is the development of creep voids.
J.A. Siefert, J.D. Parker
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Evaluation of Creep Deformation Property of Grade 91 Steels

Volume 6B: Materials and Fabrication, 2015
Creep deformation property of Grade T91 steels over a range of temperatures from 550 to 625°C was analyzed by means of the empirical creep equation reported in the previous study [1]. The creep equation consists of four time dependent terms and one constant and time to rupture is estimated as a time to total strain of 10%.
Kazuhiro Kimura, Kota Sawada, Hideaki Kushima   +2 more
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Phase transformation behavior of Grade 91 ferritic steel

Materials Science and Engineering: A, 2009
The phase transformation behavior of Grade 91 steel, which is an advanced ferritic steel, has been investigated using differential thermal analysis (DTA). In our DTA experiments, disk-shaped samples were normalized at 1080 °C, and then tempered at temperatures between +10 ° C and -40 °C of the ferrite to austenite transformation temperature (A c1 ...
T. Tokunaga, K. Hasegawa, F. Masuyama
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Properties of heavy components of steel grade 91 and their welds

Nuclear Engineering and Design, 1993
Abstract The use of the modified 9% Cr1% Mo steel grade (grade 91) for the manufacturing of heavy products (forgings, plates) for pressure vessels is evaluated on the following aspects: (i) possibility to produce heavy components (base material) with the required properties, (ii) conditions for welding without cracking, and (iii) availability of ...
P. Bocquet, Ph. Bourges, A. Cheviet
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Weld Metal Additive Manufacturing for Grade 91

Advances in Materials Technology for Power Plants
Abstract This study investigates a novel approach to addressing the persistent Type IV cracking issue in Grade 91 steel weldments, which has remained problematic despite decades of service history and various mitigation attempts through chemical composition and procedural modifications.
Teresa Melfi, Niyanth Sridharan, J. Ben Schaeffer, Zhuyao Zhang   +3 more
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Key Life Management Issues with Grade 91 Steel

Advances in Materials Technology for Power Plants, 2010
Abstract Recent evidence suggests that using hardness as the sole acceptance criterion for Grade 91 steels is inadequate for predicting service performance. Components can achieve acceptable initial hardness values through heat treatment despite suboptimal elemental composition, leading to poor tempering resistance and unexpectedly low ...
Jonathan Parker, Kent Coleman
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New ECCC assessment of creep rupture strength for steel grade X10CrMoVNb9-1 (Grade 91)

International Journal of Pressure Vessels and Piping, 2010
Abstract A first assessment of creep rupture strength for steel grade X10CrMoVNb9-1 (Grade 91) was performed by ECCC in 1995. The results were included in the European standard EN 10216. Due to a significant increase of test data and test duration it was decided in 2005 to make a re-assessment of the extended database.
W. Bendick, L. Cipolla, J. Gabrel, J. Hald   +3 more
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Premature Grade 91 failures — worldwide plant operational experiences

Engineering Failure Analysis, 2016
Abstract Four different case studies of premature failures of Grade 91 materials in Heat Recovery Steam Generators (HRSG) and power piping at combined cycle power plants throughout the world are described. The impact of plant design, the metallurgical aspects of the failures and results from finite element simulations are incorporated.
Andreas Fabricius, Peter S. Jackson
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UK experience with modified 9%Cr (grade 91) steel

Energy Materials, 2007
AbstractFollowing its introduction in the late 1980s, modified 9%Cr (grade 91) steel has found widespread use for retrofit and new build applications in the UK power industry. Although it has only been in service for a relatively short period of time, currently ∼80 000 h, a number of problems have arisen.
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