The influence of long-term aging on microstructures and static mechanical properties of P92 steel at room temperature

Guo, Xiaofeng; Gong, Jianming; Jiang, Yong; Rong, Dongsong

doi:10.1016/j.msea.2012.10.024

Cited by 37 publications

(17 citation statements)

References 22 publications

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“…• C. Similar results of microstructural degradation in 9%Cr steel were also observed in [14,15]. Moreover, the analysis of the microstructure of P92 steel after thermal ageing revealed the existence of near-boundary precipitate-depleted zones (Fig.…”

Section: Microstructure and Properties Of P92 Steel After Long-term Tsupporting

confidence: 76%

“…13), which may result from coarsening of M 23 C 6 carbides and Laves phase, but also from the probable presence of Z-phase precipitates in the microstructure, which results in a reduction in the effect of precipitation and solution strengthening. The similar impact of long-term thermal ageing on changes in mechanical properties in 9%Cr steel was also observed in [8,[12][13][14][15]24]. The effect of the time of ageing at 600 and 650…”

Section: Microstructure and Properties Of P92 Steel After Long-term Tsupporting

confidence: 73%

“…The trend mentioned above shows intensive precipitation/diffusion processes that in all likelihood occur within this time interval and are related, but not limited, to the occurrence of Laves phase. Literature data [14,27] show that Laves phase may occur in the microstructure of tungsten-modified 9%Cr steels as early as after 200 h ageing at 650…”

Section: Microstructure and Properties Of P92 Steel After Long-term Tmentioning

confidence: 99%

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Assessment of microstructure stability and mechanical properties of X10CrWMoVNb9-2 (P92) steel after long-term thermal ageing for high-temperature applications

Zieliński¹,

Golański²,

Sroka³

2016

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This paper presents changes in mechanical properties and microstructure of the material of components of a power station boiler made of X10CrWMoVNb9-2 (P92) steel after long--term thermal ageing. Mechanical properties and microstructure were examined on material in initial heat treatment condition and after long-term thermal ageing up to 100,000 h at 600 and 650• C. The microstructure was observed using a scanning and transmission electron microscope. The examinations of steel microstructure and mechanical properties in initial heat treatment condition have confirmed that the requirements for this steel are met. Longterm thermal ageing at a temperature similar to the operating one as well as mechanical properties and microstructure examinations allowed to assess the effect of long-term impact of temperature on the properties and microstructure of P92 steel. The presented method can be used for evaluation and qualification of microstructural changes in power station boiler components operating under creep conditions. K e y w o r d s : P92 steel, microstructure, mechanical properties, long-term thermal ageing

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Section: Microstructure and Properties Of P92 Steel After Long-term Tsupporting

confidence: 76%

Section: Microstructure and Properties Of P92 Steel After Long-term Tsupporting

confidence: 73%

Section: Microstructure and Properties Of P92 Steel After Long-term Tmentioning

confidence: 99%

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Assessment of microstructure stability and mechanical properties of X10CrWMoVNb9-2 (P92) steel after long-term thermal ageing for high-temperature applications

Zieliński¹,

Golański²,

Sroka³

2016

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“…The precipitates of Laves phase were observed in the steels of the 9%Cr type already after around 500 hours of creep [18,19]. Laves phase is characterized by a high proneness to coagulation [19].…”

Section: Microstructure Of P91 and Pb2 Steels After Long-term Ageingmentioning

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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“…17 MX precipitates has been observed in the intra lath region of the steel. 2,3,18,19 Laves phase has been observed as bright phase in backscattered electron (BSE) mode SEM image because of its higher average atomic number. 10,18,20 SEM secondary electron (SE) and BSE mode micrographs of both the steels in the NT, and thermal aged conditions are shown in Fig.…”

Section: Microstructurementioning

confidence: 99%

Creep deformation and rupture behaviour of thermal aged P92 steel

Sakthivel

Selvi

Laha

2016

Materials at High Temperatures

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Creep deformation and rupture behaviour of thermal aged P92 steel have been investigated over a stress range of 110-130 MPa at 923 K. Laves phase was observed in the thermal aged steel. Laves phase predominantly coarsens towards the intra-lath region assisted by substructure within the lath region. The stress dependence of minimum creep rate followed Norton's power law of creep with comparable apparent stress exponent value in the thermal aged, and normalised and tempered steels. The creep rate and creep rupture lives of both the steels were relatively comparable under lower stress level. The steel obeyed Monkman-Grant and modified Monkman-Grant ductility relationships. Enhanced precipitation of Laves phase has been observed at the necked region in both the conditions of the steel, which experienced higher plastic flow. Thermal aging of P92 steel has not significantly influenced the creep strength under longer creep duration.

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The influence of long-term aging on microstructures and static mechanical properties of P92 steel at room temperature

Cited by 37 publications

References 22 publications

Assessment of microstructure stability and mechanical properties of X10CrWMoVNb9-2 (P92) steel after long-term thermal ageing for high-temperature applications

Assessment of microstructure stability and mechanical properties of X10CrWMoVNb9-2 (P92) steel after long-term thermal ageing for high-temperature applications

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

Creep deformation and rupture behaviour of thermal aged P92 steel

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