microstructural study of creep rupture in a 12% chromium

microstructural study of creep rupture in a 12% chromium

microstructural study of creep rupture in a 12% chromium

On the microstructural evolution in 12% Cr turbine steel ... In order to study the microstructural evolution of the steel during the cyclic plastic deformation process, especially the laths and sub-blocks, EBSD maps of the samples interrupted at different lifetime fractions during 600 °C saw-tooth test were created as shown in Fig. 9. The point P0 was mapped on the as received material.

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Z-phase Formation during Creep and Aging in 912% Cr Heat microstructural study of creep rupture in a 12% chromium

terms abruptly decreases due to microstructural degrada-tion. New phases such as Laves and Z phases appear after long-term creep exposure.14) In 912% Cr ferritic steels, the Z phase precipitates after creep exposure for about 10000h at 873K. It is assumed that the formation of the Z phase causes an abrupt decrease in the creep strength since The role of Mo and W on the creep properties of 3 and 9% microstructural study of creep rupture in a 12% chromium the modified 9 to 12% chromium steels is predominantly controlled by M23C6 and VN. It has been shown that both the proof stress at room temperature and the creep rupture strength at high temperatures increase, while the creep rate decreases [1,4,5] with decreasing interparticle spacing of secondary phases. 2.1.2. The impact of welding on the creep properties of advanced 9 microstructural study of creep rupture in a 12% chromium Especially, long-running crossweld creep tests have not been performed in a sufficient extent so far, although, the heat-affected zone of crosswelds of ferritic chromium steels is known as a possible weak point. The long-term creep properties of crosswelds is linked to microstructure of the heat-affected zone of 912% chromium steels.

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On the microstructural evolution in 12% Cr turbine steel microstructural study of creep rupture in a 12% chromium In order to study the microstructural evolution of the steel during the cyclic plastic deformation process, especially the laths and sub-blocks, EBSD maps of the samples interrupted at different lifetime fractions during 600 C saw-tooth test were created as shown in Fig. 9. The point P0 was mapped on the as received material. Modelling and experimental study of the tertiary creep stage microstructural study of creep rupture in a 12% chromium This article addresses experimental studies and analytical simulations of the tertiary creep stage of Grade 91 steel tested at various stresses and temperatures between 500C (up to 160  103 h) and 600C (up to 94  103 h). The strain rate increases after its minimum mainly because of the softening of the material which microstructure evolves strongly during creep microstructural study of creep rupture in a 12% chromium

Measurement of creep deformation of ex-service 12% Cr steel microstructural study of creep rupture in a 12% chromium

Higher creep damage in the steel due to longer service exposure and higher void densities is revealed by shorter rupture times, faster creep rates and tertiary-dominated creep curves when compared to the lower creep damage state. Microstructural study via quantitative electron microscopy confirms the dislocation creep-driven growth of subgrains microstructural study of creep rupture in a 12% chromium Measurement of creep deformation of ex-service 12% Cr steel microstructural study of creep rupture in a 12% chromium Microstructural study of creep rupture in a 12% chromium ferritic steel. Article. Jan 1989 microstructural study of creep rupture in a 12% chromium Microstructural observation shows that the carbides in the exposed pipe coarsened heavily with microstructural study of creep rupture in a 12% chromium Investigation on creep behavior of welded joint of advanced 9 microstructural study of creep rupture in a 12% chromium The creep behavior of advanced 9%Cr-1 (BM1) and advanced 9%Cr-2 (BM2) dissimilar welded joints was investigated in this paper, and also the microstructures were elaborately characterized. Based on the fitting with MATLAB, a 3-D curved surface describing the primary and steady-state creep stage was achieved.

Investigation of microstructural evolution and creep rupture microstructural study of creep rupture in a 12% chromium

The creep results demonstrate that the minimum creep strain rate increases with the increase of stress while creep rupture time decreases as stress increased. At the medium stress level of 200 MPa and 220 MPa, SSCR values for cross-weld are 26-fold higher than the parent metal, whilst the time to rupture is 14- to 18-fold shorter as compared to microstructural study of creep rupture in a 12% chromium Effect of Creep Stress on the Microstructure of 912% Cr microstructural study of creep rupture in a 12% chromium This paper presents the study of creep-fatigue interaction damage and creep rupture limit for 912% Cr steam turbine rotor under coupled cyclic thermal-mechanical loadings that alter in phase microstructural study of creep rupture in a 12% chromium Development of high (7-12%) chromium martensitic steels microstructural study of creep rupture in a 12% chromium Request PDF | On Jan 1, 2001, R.L. Klueh and others published Development of high (7-12%) chromium martensitic steels | Find, read and cite all the research you need on ResearchGate

Detection of microstructural changes of 9% Crmartensitic microstructural study of creep rupture in a 12% chromium

Considering the abovementioned results, it seems possible to detect microstructural changes due to aging or creep of 912% chromium steels by electrochemical methods. But the assessment of the damage degree needs a reliable evaluation criterion with possibilities to define critical threshold values. Characterization of the creep properties of heat resistant 9 microstructural study of creep rupture in a 12% chromium The tempered martensite microstructure of P91 and other 912% chromium steels as well as the microstructural evolution during high temperature loading of these steels and their long-term creep behavior have been analyzed comprehensively, e.g. , , , , . Carbide Coarsening During Creep in 12 Percent CrMoV Steel microstructural study of creep rupture in a 12% chromium Carbide coarsening has been investigated in a 12 percent CrMoV steel. Studies in the gauge length (creep exposed) and in the head (stress free ageing) for both interrupted and ruptured creep specimens tested at an initial stress of 80 MPa at various temperatures and at 600C at different initial stresses have been performed.

Analysis of steady state creep behaviour of 912% chromium microstructural study of creep rupture in a 12% chromium

The present work deals with the creep behaviour of 912% Cr steels in the steady state (secondary) creep regime in order to enable a more detailed and exact description of the creep rupture strength on the basis of the Monkman Grant relationship. Special attention is paid to the microstructural aspects. Analysis of steady state creep behaviour of 912% chromium microstructural study of creep rupture in a 12% chromium The present work deals with the creep behaviour of 912% Cr steels in the steady state (secondary) creep regime in order to enable a more detailed and exact description of the creep rupture microstructural study of creep rupture in a 12% chromium Advances in welded creep resistant 9-12%Cr steels (October microstructural study of creep rupture in a 12% chromium Creep rupture studies on modified 9-12%Cr steels have been largely focused on the rupture strength of the parent steels. Much less attention has been given to the behaviour of weldments. The failure of high chromium steels in power plant components is often associated with failure in the 'type IV' region.

A new methodology for analysis of creep and creep fracture microstructural study of creep rupture in a 12% chromium

(2008). A new methodology for analysis of creep and creep fracture data for 912% chromium steels. International Materials Reviews: Vol. 53, No. 2, pp. 91-104. A new 12% chromium steel strengthened by Z-phase precipitates A new 12% chromium steel strengthened by Z-phase precipitates Abstract In order to increase the corrosion resistance and simultaneously maintain the creep resistance of 9-12% Cr steels at 650C, a new alloy design concept was proposed, using thermodynamically stable Z-phase (CrTaN) precipitates to strengthen the steel. A new trial Z- Study of Creep Damage in a 10.86% Cr Heat Resistant Steel microstructural study of creep rupture in a 12% chromium The relationship between heterogenous spatial distribution of creep voids and variation in rupture life has been exploited in terms of microstructural sites during the onset of creep embrittlement. Study of Creep Damage in a 10.86% Cr Heat Resistant Steel using Synchrotron X-Ray Microtomography | Scientific.Net

Microstructural stability of 912%Cr ferrite/martensite heat microstructural study of creep rupture in a 12% chromium

The microstructural evolutions of advanced 912%Cr ferrite/martensite heat-resistant steels used for power generation plants are reviewed in this article. Despite of the small differences in chemical compositions, the steels share the same microstructure of the as-tempered martensite. It is the thermal stability of the initial microstructure that matters the creep behavior of these heat microstructural study of creep rupture in a 12% chromium Microstructural stability of 9--12%Cr ferrite/martensite heat microstructural study of creep rupture in a 12% chromium Eggeler G, Nilsvang N, Ilschner B. Microstructural changes in a 12%Cr steel during creep. Steel Research, 1987, 58(2): 97103 39: Eggeler G, Earthman J C, Nilsvang N, . Microstructural study of creep rupture in a 12% chromium ferritic steel. Acta Metallurgica, 1989, 37(1): 4960 Microstructural changes in steel 10Kh9V2MFBR during creep for microstructural study of creep rupture in a 12% chromium In this work, we have investigated microstructural changes in steel 10Kh9V2MFBR (analog of P02 steel) after long-term creep tests at a temperature of 600C under an initial stress of 137 MPa. Time to rupture was found to be more than 40000 h. It has been established that, in the zone of grips and in the neck region of the sample, the size of the particles of the M 23C6 carbides increases from microstructural study of creep rupture in a 12% chromium

Microstructural analysis on a creep resistant martensitic 9 microstructural study of creep rupture in a 12% chromium

The present work deals with the creep behaviour of 912% Cr steels in the steady state (secondary) creep regime in order to enable a more detailed and exact description of the creep rupture microstructural study of creep rupture in a 12% chromium Microstructural Stability During Creep Exposure of 9Cr-1Mo microstructural study of creep rupture in a 12% chromium A modified 9Cr-1Mo steel has been exposed to three separate austenitization temperatures, i.e., at 950, 1025, and 1100 C for normalization. After subsequent tempering at 750 C, the normalized and tempered samples were creep-tested at temperatures of 550, 600, and 650 C. The creep strength of the investigated samples was evaluated in terms of minimum creep strain rate and microstructural study of creep rupture in a 12% chromium Microstructural study of creep rupture in a 12% chromium microstructural study of creep rupture in a 12% chromium Microstructural study of creep rupture in a 12% chromium ferritic steel By Gunther Eggeler, James C. Earthman, N. Nilsvang and Bernhard Ilschner No static citation data No static citation data Cite

Creep Damage Assessment of Ex-Service 12% Cr Power Plant microstructural study of creep rupture in a 12% chromium

The lifetime of steam pipelines in long-term operation in coal-fired power plants are limited due to material damage that resulted from creep exposure. In the present study, the authors comparatively assess the damage of ex-service 12% Cr piping steel with varying degrees of exposure while using accelerated creep tests that employ digital image correlation (DIC) as well as microstructural microstructural study of creep rupture in a 12% chromium Creep Behaviour and Microstructural Stability of FB2 (CrMoCoB microstructural study of creep rupture in a 12% chromium Study of the microstructure of the grade 91 steel after more than 100,000h of creep exposure at 600 degree C Panait, C. / Bendick, W. / Fuchsmann, A. / Gourgues-Lorenzon, A.F. / Besson, J. | 2009 Creep Microstructural Changes in Power Plant Steels: Part Two microstructural study of creep rupture in a 12% chromium The steel 912% Cr is used in the normalized-and tempered or quenched-and-tempered condition, and unless otherwise stated, possesses a 100% tempered martensite microstructure (Figure 1). For these conditions, the strength of the 912% Cr steels will depend on the tempered martensite microstructure and the precipitates therein.

32 Post-irradiation creep rupture properties of the 12% microstructural study of creep rupture in a 12% chromium

Conclusions The results of the investigation of the postirradiation creep behaviour of stabilized and unstabilized 12% chromium martensite steels may be summarized as follows: 1. The Nb-stabilized steel 1.4914 possesses the better creep rupture strength but nearly the same rupture elongation as the unstabilized 1.4923 after 5x10^ h.

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