Improvement of reliability and creep resistance in advanced low-alloy steels

Mohyla, Petr; Foldyna, Václav

doi:10.1016/j.msea.2008.05.056

Cited by 26 publications

(26 citation statements)

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“…• C, followed by their gradual decrease with further increasing of ageing time up to 5000 h. This result correlates well with findings of Mohyla and Foldyna [11] who observed the similar tendency of hardness values in over-heated coarse-grained HAZ of their homogeneous T24/T24 weldments subjected to PWHT at 750…”

Section: Mechanical Properties and Microstructure Evolutionsupporting

confidence: 91%

“…• C [9][10][11]. Microstructural evolution and mechanical properties of T24 steels during long-term ageing and/or creep exposure have been widely studied by many authors [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Microstructural evolution and mechanical properties of T24 steels during long-term ageing and/or creep exposure have been widely studied by many authors [10][11][12][13][14][15][16]. These studies revealed precipitation of several secondary phases in T24 base materials and their welded joints such as MX, M 2 C, M 6 C, M 7 C 3 , and M 23 C 6 , where M stands for various metallic elements, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Falat¹,

Čiripová²,

Homolová³

et al. 2016

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The effects of thermal exposure at 600• C and subsequent electrolytic hydrogen charging at ambient temperature were studied in terms of their influence on notch-tensile properties and fracture behaviour of individual heat-affected zones (HAZ) of Ni-based transition weldments between T24 and T92 creep-resistant steels. The experimental welded joints were prepared by gas tungsten arc welding using "Inconel-type" filler metal Nirod 600. Post-weld heat treatment (PWHT) was carried out at 720• C for 2 h, followed by passive cooling within tempering furnace. Subsequent long-term ageing of two series of prepared T24/T92 dissimilar welds at 600• C for 1000 and 5000 h, respectively, led to gradual changes in both T24 and T92 HAZ microstructures, which were mainly related to their additional tempering accompanied by the coarsening of original precipitates as well as newly-formed secondary phases. The observed thermally-induced microstructural changes together with subsequently applied hydrogen charging effects resulted in complex variations in tensile properties and fracture behaviour of individual HAZ regions related to the pre-existing differences in their initial tempering grade due to the used PWHT procedure. K e y w o r d s : creep-resistant steels, dissimilar welding, isothermal ageing, hydrogen embrittlement, mechanical properties, fracture mechanisms

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Section: Mechanical Properties and Microstructure Evolutionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Falat¹,

Čiripová²,

Homolová³

et al. 2016

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“…The cavity nucleation and growth behavior under moderate stress level Mohyla and Foldyna [17] stated that at 873K (600 ) and at 110MPa, the microstructure of the experimental specimens has seen the elliptical creep cavities, wedge type creep cavities and grain boundary cavities. These results indicate that the creep deformation and rupture behavior is a mixture mechanism under the stress level of 0.4-0.5 .…”

Section: The Cavity Nucleation and Growth Behavior Under Lower Stressmentioning

confidence: 99%

Review of Creep Cavitation and Rupture of Low Cr Alloy and its Weldment

Pang

et al. 2013

AMR

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Abstract. This paper presents a review of creep cavitation and rupture of low Cr alloy and its weldment, particular in the heat-affected zone (HAZ). Creep damage is one of the serious problems for the high temperature industry. One of the computational approaches is continuum damage mechanics which has been developed and applied complementary to the experimental approach and assists in the safe operation. However, the existing creep damage constitutive equations are not developed specifically for low stress. Therefore, in order to form the physical bases for the development of creep damage constitutive equation, it is necessary to critically review the creep cavitation and rupture characteristics of low Cr alloy and its weldment.

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“…If the chemical composition is given, the microstructure of these steels depends on the heat treatment, temperature and time of creep exposure [57].…”

Section: Microstructure Evolution In Inservice Materialsmentioning

confidence: 99%

Heat-Resistant Steels, Microstructure Evolution and Life Assessment in Power Plants

Hu¹

2012

Thermal Power Plants

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Improvement of reliability and creep resistance in advanced low-alloy steels

Cited by 26 publications

References 0 publications

Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Review of Creep Cavitation and Rupture of Low Cr Alloy and its Weldment

Heat-Resistant Steels, Microstructure Evolution and Life Assessment in Power Plants

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