Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation

Gwoździk, M.; Motylenko, Mykhaylo; Rafaja, David

doi:10.1088/2053-1591/ab5fc8

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…3a-b). On the other hand, the exploited material was characterized by degraded bainite, a small amount of ferrite and precipitated carbides concentrated at the grain boundaries [8] (Fig. 3c-d).…”

Section: Microstructural Analysis Of Damage Developmentmentioning

confidence: 99%

“…It was reported that the long-term operation of power engineering steels leads to significant changes in their microstructure which mainly include the diffusion of alloying elements out of the bainite, formation and coagulation of carbide precipitates at the grain boundaries, and partial transformation of original bainite to ferrite [8,15]. It was…”

Section: Microstructural Analysis Of Damage Developmentmentioning

confidence: 99%

“…Furthermore, such comparative studies clearly indicate whether the exploited material could be further used without a decrease of safety and reliability of the power engineering constructions. Gwozdzik et al [8] applied optical and transmission electron microscopy as well as standard tensile tests and Charpy tests on 10CrMo9-10 and 13CrMo4-5 steels (low-carbon chrome-molybdenum grade) before and after long-term operation at elevated temperatures in a steam heater. Golasinki et al [9] provided a detailed description of the microstructural changes in the high-chromium martensitic steels that occurred under creep conditions to further extend their time of safe operation in the particular structural elements of power systems.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue damage development in 10CrMo9-10 steel for power plant pipes in as-received state and after 280,000 h of exploitation

Kopeć

Brodecki

Kowalewski

2023

Archiv.Civ.Mech.Eng

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This paper discusses an effect of 280,000 h of exploitation under internal pressure of 2.9 MPa and high temperature of 540 °C on the mechanical properties of 10CrMo9-10 (10H2M) power engineering steel. The mechanical response of the specimens obtained from two pipes: a new in the as-received state and exploited for a long period was assessed through the uniaxial tensile tests and subsequent fatigue tests. The long-term, high-temperature exposure of 10H2M steel resulted in the deterioration of its mechanical properties and was quantitatively described as a function of the fatigue damage measure, φ, and the fatigue damage parameter D. Finally, the proposed methodology of power exponent approximation with both damage sensitive parameters (φ, D) enabled for successful determination of the 10H2M steel fatigue life.

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Section: Microstructural Analysis Of Damage Developmentmentioning

confidence: 99%

Section: Microstructural Analysis Of Damage Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue damage development in 10CrMo9-10 steel for power plant pipes in as-received state and after 280,000 h of exploitation

Kopeć

Brodecki

Kowalewski

2023

Archiv.Civ.Mech.Eng

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“…Small amounts of molybdenum (up to 0.35 wt.%) and chromium (up to 0.3 wt.%) provide heat resistance [9]. 13Cr (13CrMo4-5) is a higher-alloyed steel that contains up to 1 wt.% Cr and up to 0.6 wt.% Mo compared to 16Mo3 and has better oxidation and creep resistance [10].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation of Boiler Steels at 650 °C

Burja,

Šetina Batič,

Žužek

et al. 2023

Metals

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This study presents a comprehensive investigation of the formation, composition and behaviour of oxide layers during the high-temperature oxidation of four different steel alloys (16Mo3, 13Cr, T24 and P91) at a uniform temperature of 650 °C. The study is aimed at assessing the oxidation damage due to short-term overheating. The research combines CALPHAD (CALculation of PHAse Diagrams) calculations, thermogravimetric analysis (TGA) and advanced microscopy techniques, including scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), to elucidate the complex mechanisms controlling oxidation kinetics and oxide layer development. CALPHAD calculations were used to determine the thermodynamically stable phases for each steel type at 650 °C and different oxygen activities. The results showed different phase compositions, highlighting the importance of the chromium content in steel for the formation of oxide layers. The different oxidation kinetics and oxide layer compositions are presented and associated with the increased risk of material degradation due to overheating. These results have significant implications for industrial applications, mainly the susceptibility to oxidation of low-alloyed steels like 16Mo3 and 13 Cr and contribute to a deeper understanding of oxidation processes in steels.

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Analysis of the Creep Mechanism of Low-Alloy Steel in Terms of Plastic Deformation

Jakubowska,

Chulist,

Maj

et al. 2024

J. of Materi Eng and Perform

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As the proportion of renewable energy sources within the energy grid increases, boiler operations increasingly rely on managing disparities in energy supply. This condition substantially curtails their operational lifespan due to frequent switching cycles. Materials exposed to prolonged stress at high temperatures in harsh environments gradually degrade and eventually fail catastrophically. Thus, understanding processes like creep is essential for accurately evaluating the condition of operational components under new operational standards in power plants. In this regard, this paper introduces an innovative methodological framework for analyzing the creep mechanism, focusing on the plastic deformation of a crucial pipeline segment, specifically an elbow composed of 14MoV6-3 steel, both before and after extensive usage periods (164,000 and 302,000 h). The study explored the development of microstrain from the material's surface employing the electron backscattered diffraction method. This analysis assessed how operational durations influence dislocation structural changes, as examined by synchrotron radiation techniques, across a material depth from 0 to 1.5 mm. Based on these observations, the extent of deformation over time was demonstrated. Furthermore, the evolution of precipitation processes was investigated through transmission electron microscopy. These tests allowed to obtain and compare information on the dislocation structure of the tested steel after service in creep conditions, of small and large volumes of material.

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Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation

Cited by 15 publications

References 21 publications

Fatigue damage development in 10CrMo9-10 steel for power plant pipes in as-received state and after 280,000 h of exploitation

Fatigue damage development in 10CrMo9-10 steel for power plant pipes in as-received state and after 280,000 h of exploitation

High-Temperature Oxidation of Boiler Steels at 650 °C

Analysis of the Creep Mechanism of Low-Alloy Steel in Terms of Plastic Deformation

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