Embrittlement of 21/4 CrMoV steel bolts after long exposure at 540 °C

Qu, Z.; Kuo, K. H.

doi:10.1007/bf02642347

Cited by 38 publications

(9 citation statements)

References 2 publications

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“…The dependence between the precipitates on the grain boundaries and the growth of brittleness in the low-alloy steels has been discussed inter alia in the publications [15,17]. However, according to studies [18], brittleness of CrMoV steels serviced below the temperature of 540°C is not connected with the precipitations on the boundaries of grains. The above shows that the main cause for the growth of brittleness in the investigated steel can be the increase in the concentration of phosphorus on the boundaries of grains.…”

Section: Mechanical Properties Of Crmov Steel After Servicementioning

confidence: 99%

Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service

Golański

Pietryka

Słania

et al. 2016

Archives of Metallurgy and Materials

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The paper presents the results of research on the microstructure and mechanical properties of 12HMF steel after longterm service. The investigated material was taken from a pipeline with circumferential welded joint after 419 988 hours of service at the temperature of 490°C, steam pressure 8 MPa. Performed research has shown that the 12HMF steel after service was characterized by a typical microstructure for this grade of steel, that is a ferritic-bainitic microstructure without any visible advanced processes of its degradation. The investigation of mechanical properties has shown that the examined steel after service was characterized by a very low impact energy KV, and yield strength lower than the required minimum. Whilst tensile strength and yield strength determined at elevated temperature was higher and similar to the standard requirements, respectively. It has been proved that the main cause of an increase in brittleness and a decrease in yield strength of the examined steel should be seen in the segregation of phosphorus to grain boundaries and the formation of precipitate free zones near the boundaries.

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Section: Mechanical Properties Of Crmov Steel After Servicementioning

confidence: 99%

Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service

Golański

Pietryka

Słania

et al. 2016

Archives of Metallurgy and Materials

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“…Zależność pomiędzy wydzieleniami na granicach ziaren a wzrostem kruchości niskostopowych stali była dyskutowana m.in. w [8,16], natomiast wg [17] kruchość stali CrMoV eksploatowanych poniżej temperatury 540 o C nie jest związana z wydzieleniami po granicach ziaren. Powyższe może wskazywać, że główną przyczyną wzrostu kruchości badanej stali była dyfuzja domieszek, głównie fosforu do granic ziaren i powierzchni międzyfazowych węglik/osnowa.…”

Section: Rys 2 Zubożony W Wydzielenia Obszar Przygraniczny Ziarna Funclassified

Mikrostruktura i właściwości mechaniczne złącza spawanego stali 12HMF po długotrwałej eksploatacji; Microstructure and mechanical properties of welded joint of 12HMF steel after long-term service

Golański

Słania

Jasak

et al. 2014

Przegląd Spawalnictwa

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Mikrostruktura i właściwości mechaniczne złącza spawanego stali 12HMF po długotrwałej eksploatacji Microstructure and mechanical properties of welded joint of 12HMF steel after long-term service Dr hab. inż. Grzegorz Golański; dr hab. inż. Jacek Słania, prof. PCz; mgr inż. Joanna Jasak-Politechnika Częstochowska; dr inż. Izabela Pietryka-Politechnika Krakowska; mgr inż. Paweł Urbańczyk

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“…However, when low alloy steels are used for long periods at high temperatures, carbide-induced embrittlement, temper embrittlement and softening of the matrix can occur due to thermal degradation. [1][2][3] Thermal degradation shortens the lifespan of facilities and can bring about large-scale disaster due to sudden damage. Therefore, it is of utmost importance to evaluate degradation to ensure the safety of structures.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Degradation Assessment in Pressure Vessel Steel by Harmonic Generation Technique

KIM

PARK

2008

J. Nucl. Sci. Technol.

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The harmonic generation technique has been used to characterize the isothermal degradation of pressure vessel steel. The isothermal degradation was conducted at 630 C with forged 2.25Cr-1Mo steel. The variation in the normalized ultrasonic nonlinearity parameter (= 0 ) was interpreted as having resulted from microstructural evolution, which was supported by the results of electron microscopy and X-ray diffraction, in addition to Vickers hardness and ductile-brittle transition temperature. The normalized ultrasonic nonlinearity parameter increased progressively with the isothermal degradation time due to the increase in the volume fraction of equilibrium M 6 C carbide and the variation in the lattice parameter of M 23 C 6 carbide. It was found that the nonlinearity parameter was very sensitive to the microstructure during the isothermal degradation of 2.25Cr-1Mo steel. The harmonic generation technique has the potential to assess microstructural changes due to isothermal degradation.

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Embrittlement of 21/4 CrMoV steel bolts after long exposure at 540 °C

Cited by 38 publications

References 2 publications

Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service

Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service

Mikrostruktura i właściwości mechaniczne złącza spawanego stali 12HMF po długotrwałej eksploatacji; Microstructure and mechanical properties of welded joint of 12HMF steel after long-term service

Microstructural Degradation Assessment in Pressure Vessel Steel by Harmonic Generation Technique

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