Modelling the strain and stress state under creep conditions in P91 steel

Duda, Piotr; Felkowski, Łukasz; Dobrzański, J.; Purzyńska, H.

doi:10.1080/09603409.2015.1113021

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…The investigations presented in the work constitute the database of material characteristics of steels and alloys as well as welded joints made of them working under creep conditions, which are developed by the Institute for Ferrous Metallurgy [15][16][17]. The results of the investigations are used in the diagnostics of pressure components of power boilers as well as in modernisation and design of pressure components of steam boilers for the modern power industry.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Zieliński¹,

Dobrzański²,

Purzyńska³

et al. 2017

Archives of Metallurgy and Materials

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This article presents the results of investigations on HR6W alloy and Sanicro 25 steel and the dissimilar welded joint made of them. The characteristic images of microstructure of the investigated materials in the as-received condition and following the creep test, observed with a scanning electron microscope (SEM), are shown. The X-ray analysis of phase composition of the existing precipitates was carried out. The method for evaluation of creep strength based on abridged creep tests carried out at a temperature higher than the design one is presented. The obtained results do not deviate from the values of creep strength determined in longterm creep tests. The maximum difference in creep strength of the investigated materials is ±20%, which is in compliance with the acceptable scatter band. The methodology presented can be used for verification of creep strength (life time) of the material of finished components to be operated under creep conditions.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Zieliński¹,

Dobrzański²,

Purzyńska³

et al. 2017

Archives of Metallurgy and Materials

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“…Previous experience from the use of martensitic 9%Cr steels in the power industry -P/T91, P92 and E911 steels, shows that the main mechanism of degradation of these steels are the processes of coagulation of M 23 C 6 carbides and the precipitation and growth of Laves phase on the boundaries [1][2][3]. The M 23 C 6 carbides in the microstructure of 9%Cr steel fulfill a very significant role as a factor stabilizing the martensitic lath microstructure.…”

Section: Introductionmentioning

confidence: 99%

“…The precipitation and fast growth of Laves phase particles on the boundaries leads to a decrease in the crack resistance and an increase in the steel brittleness. On the other hand, matrix depletion of the substitution elements (chromium, molybdenum, tungsten), as a result of their diffusion to the precipitating Laves phase, increases the steel susceptibility to the process of recovery and polygonization of the matrix, and reduces the resistance to oxidation [2][3][4][5]. A partial antidote to the mentioned negative effect of M 23 6 , which coagulate slower during the service and additionally have an influence on the increase in dispersion of these precipitates.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of stability of 9%Cr steel microstructure after long-term ageing

Golański

Jasak

Zieliński

et al. 2017

Archives of Metallurgy and Materials

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The paper presents the results of research on the microstructure of martensitic X10CrMoVNb9-1 (P91) and X13CrMoCo-VNbNB9-2-1 (PB2) steel subject to long-term ageing at the temperature of 620°C and holding times up to 30 000 hours. The microstructural tests of the examined steel types were performed using a scanning microscope Joel JSM -6610LV and a transmission electron microscope TITAN 80 -300. The stability of the microstructure of the investigated steels was analyzed using a quantitative analysis of an image, including measurements of the following: the density of dislocations inside martensite/subgrain laths, the width of martensite laths, and the mean diameter of precipitates. It has been concluded that during long-term ageing, the microaddition of boron in PB2 steel significantly influenced the slowing of the process of degradation of the martensitic steel microstructure, as a result of slowing the process of coagulation of M 23 C 6 carbides and Laves phase. It had a favorable effect on the stabilization of lath microstructure as a result of retardation of the processes of recovery and polygonization of the matrix.

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“…The aim of this paper is to work out a procedure of comprehensive analysis of thermomechanical low-cycle fatigue behaviour on the example of P91 steel, widely used in power industry applications (Duda et al, 2016). Firstly, the material is tested experimentally in two test temperatures, then the material behaviour is described by a constitutive model implemented into a numerical procedure.…”

Section: Introductionmentioning

confidence: 99%

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Sulich

Egner

Mroziński

et al. 2017

jtam

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Thermomechanical low cycle fatigue behaviour of P91 steel used in power industry applications has been extensively investigated. The constitutive model of Armstrong-Frederick, extended with temperature rate effects, has been applied to describe the behaviour of the thermo-elastic-plastic material. The proposed model has been successfully implemented in simulation of low cycle fatigue of the examined steel in two different temperatures.

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Modelling the strain and stress state under creep conditions in P91 steel

Cited by 15 publications

References 9 publications

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Quantitative analysis of stability of 9%Cr steel microstructure after long-term ageing

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

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