Microstructure of super-austenitic steels after long-term annealing

2010 ◽  
Vol 101 (6) ◽  
pp. 729-735 ◽  
Author(s):  
Martin Kraus ◽  
Aleš Kroupa ◽  
Peter Miodownik ◽  
Milan Svoboda ◽  
Jan Vrestal
Keyword(s):  
Austenitic Steels

Construction of Theoretical Curves of the Long-Term Strength for Neutron-Irradiated Austenitic Steels Kh18N9 and 08Kh16N11M3

2018 ◽  
Vol 9 (6) ◽  
pp. 1254-1262 ◽  
Author(s):  
A. G. Gulenko ◽  
B. Z. Margolin ◽  
A. A. Buchatskii ◽  
A. A. Nuzhdov
Keyword(s):  
Austenitic Steels ◽  
Term Strength

Effect of neutron irradiation on the long-term thermal cycling resistance of austenitic steels

1986 ◽  
Vol 18 (5) ◽  
pp. 599-605
Author(s):  
Yu. F. Balandin ◽  
A. F. Malygin ◽  
V. A. Nikolaev
Keyword(s):  
Thermal Cycling ◽  
Neutron Irradiation ◽  
Austenitic Steels

scholarly journals Long‐term exposure of austenitic steels and nickel‐based alloys in lignite‐biomass cofiring

2019 ◽  
Vol 70 (12) ◽  
pp. 2179-2189 ◽  
Author(s):  
Xabier Montero ◽  
Mario Rudolphi ◽  
Mathias C. Galetz
Keyword(s):  
Austenitic Steels ◽  
Biomass Cofiring

scholarly journals Local corrosion of austenitic steels and alloys for heat exchanger tubes of nuclear power stations steam generators

2019 ◽  
Vol 75 (2) ◽  
pp. 227-241 ◽  
Author(s):  
L. A. Pisarevskii ◽  
A. B. Korostelev ◽  
A. A. Lipatov ◽  
G. A. Filippov ◽  
T. Yu. Kin
Keyword(s):  
Thermal Aging ◽  
Nuclear Power ◽  
Austenitic Steels ◽  
Local Corrosion ◽  
Nickel Steel ◽  
Water Type ◽  
Low Carbon ◽  
Steam Generators ◽  
Power Stations

Elaboration of modern domestic structural materials with increased corrosion resistance in contact with advanced heatcarriers of future reactor plants is an important problem at development of innovation projects of nuclear power engineering. Heatexchanging tubes are the critical components, which influence on the safety and reliability of steam generators operation. Corrosion properties of non-stabilized nitrogen-containing corrosion resistant steels of austenite class after cold deformation, thermal treatment and long-term thermal aging studied. It was shown, that silicon introducing into chrome-nickel steel, alloyed by nitrogen and molybdenum, results in increasing of its resistance against local kinds of corrosion and equated it on resistance against intercrystallite and pitting corrosion with particularly low-carbon steels and alloys. But the experimental 03Х18Н13С2АМ2ВФБР-Ш low carbon micro-alloyed steel, proposed for operation at a heat-carrier temperature of 450–500 о С, in the first version had a tendency to a decrease of resistance against local corrosion and impact resistance after long-term thermal aging at temperatures of 360 о С and higher. At present specifying of technological parameters of production and balanced alloying element content takes place, which prevents heat exchanging tubes properties degradation. Steel 03Х17Н13С2АМ2 which has higher resistance against local corrosion and strength comparing with 316LN and 08Х18Н10Т grades, can be taken as a candidate material for production of heat-exchanging tubes of steam generators of nuclear power stations having power reactors of water-water type. The new 03Х17Н9АС2 steel, resistant against inter-crystallite corrosion in high-oxidizing media, was proposed for tests of its operation under conditions of contact with lead heat-carriers instead of 10Х15Н9С3Б1-Ш (ЭП 302-Ш) steel.

Nanoscale compositional changes in Cr-Mn steels α-bombarded at 773 K

1990 ◽  
Vol 48 (4) ◽  
pp. 924-925
Author(s):  
Erico Ruedl ◽  
Giovanni Valdrè
Keyword(s):  
Radiation Damage ◽  
High Energy ◽  
Austenitic Steels ◽  
Energy Spectra ◽  
Fusion Reactors ◽  
Structural Components ◽  
Fusion Technology ◽  
Compositional Changes ◽  
Α Particles

The structural materials for nearer-term fusion reactors such as ITER and DEMO will likely be steels. During their operation, the radiation damage in the structural components made of steels will become very complex since the damage is produced simultaneously by high energy neutrons, protons, α-particles and other particles. As long as no fusion device for material testing exists, data about the formation of radiation damage in candidate steels can only be obtained by simpler irradiating condition such as by neutrons with mixed energy spectra, protons and/or α-particles. The present work deals with a study of Cr-Mn austenitic steels, a category of materials of current interest in fusion technology because it is expected to produce less long term waste than Cr-Ni steels.The materials examined were: AMCR 0033 composed of ∼71wt% Fe, 17.5 Cr, 10.4 Mn, 0.53 Si, 0.2 N, 0.1 C; Nitronic 32 composed of ∼66.5 Fe, 12.3 Cr, 18 Mn, 1.5 Ni, 0.55 Si, 0.18 Cu, 0.35 N 0.1 C; AMCR composed of ∼71 Fe, 10 Cr, 17.5 Mn, 0.57 Si, 0.25 Cu, 0.2 C, 0.06 N.

Cold Work Effect on Creep Rupture Strength of Austenitic Boiler Steels

2007 ◽  
Author(s):  
Fujimitsu Masuyama
Keyword(s):  
High Temperature ◽  
Creep Strength ◽  
Rupture Strength ◽  
Cold Work ◽  
Creep Rupture ◽  
Austenitic Steels ◽  
Chemical Compositions ◽  
Creep Rupture Strength ◽  
Cold Worked

In order to clarify the effect of cold work, warm work at working temperatures of up to 400°C and chemical compositions on the creep rupture strength of austenitic steels used for boiler tubing and high temperature support structures, long-term creep rupture tests were carried out on typical 18Cr-8Ni system steels consisting of TP304H, TP316H, TP321H and TP347H grade tubes and of TP321 plates. The long-term (100,000 hours) creep rupture strength of these steels was evaluated in terms of working ratio and Ni-equivalent. It was consequently clarified that creep rupture strength was substantially reduced in the cold-worked TP321 and TP321H materials, although warm-work resulted in less work-induced deterioration. It was also found creep rupture strength was enhanced by the higher Ni-eq in 18Cr-8Ni austenitic steels, and that the combined conditions of working ratio and Ni-eq govern the creep rupture strength criteria of weaker or stronger than as-received strength. Additionally the effect of cold work on the creep rupture strength and ductility of recently developed creep-strength enhanced 23Cr austenitic stainless steel (a candidate material for the hot end of superheaters in ultra-high temperature fossil-fired power plants) was considered. The strength of cold worked 23Cr austenitic steel was observed to fall below the as-received strength at stresses within about 120MPa, while re-solution annealing recovered the creep strength level to the as-received strength across the entire stress region.

Effects of Long‐Term Ageing at High Temperatures on Oxide Scale Development and Evolution of Austenitic Steels Microstructure

2020 ◽  
Vol 91 (6) ◽  
pp. 1900595
Author(s):  
Adam Zieliński ◽  
Tomasz Pawel Dudziak ◽  
Grzegorz Golański ◽  
Jarosław Gazdowicz ◽  
Anna Kołodziej
Keyword(s):  
Scale Development ◽  
Oxide Scale ◽  
High Temperatures ◽  
Austenitic Steels ◽  
Development And Evolution

The Changes in Mechanical Properties of Austenitic Creep Resistant Steels SUPER 304H and HR3C Caused by Medium-Term Isothermal Ageing

2016 ◽  
Vol 258 ◽  
pp. 639-642 ◽  
Author(s):  
Jakub Horváth ◽  
Jiří Janovec ◽  
Michal Junek
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Power Plants ◽  
Secondary Phase ◽  
Thermal Exposure ◽  
Austenitic Steels ◽  
Secondary Phases ◽  
Initial State ◽  
The Impact

The paper presents the results of the analysis of secondary phases formed during thermal exposure in creep resistant austenitic steels of SUPER 304H and HR3C types. These steels were worldwide used for construction of the superheaters (the heat exchangers) of supercritical and ultra-supercritical (USC) coal-fired power plants. In order to accelerate precipitation processes, the steels were isothermally aged at 675 °C for 20 000 h. The investigations of the precipitates were primarily focused on the occurrence of brittle phases. Changes in mechanical properties caused by occurrence of secondary phases were documented by tensile testing and measurement of the impact strength. For comparison reasons, the impact tests of the initial state of the steels were also performed. The results showed that long-term ageing had led to the significant decrease of the impact strength. Correlation between precipitation of secondary phase and measured values of mechanical properties is shown. The influence of brittle phases on long-term durability of the degraded steel regarding its insufficient impact strength has been discussed.

Sign in / Sign up

Export Citation Format

Share Document