Heat Strength Evaluation and Microstructures Observation of the Welded Joints of One China-Made T91 Steel

Gong, Yi; Yang, Zhen‐Guo; Yang, Fa-Yun

doi:10.1007/s11665-011-0048-4

Cited by 15 publications

(6 citation statements)

References 39 publications

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“…Above changes cause an accelerated damage of a mentioned area during a process of exploitation in the creeping conditions. This type of damage is called cracks of Type IV [18][19][20]. A size of the grain in this area was variable and according to the range patterns was from 7 to 10, which corresponds to an average diameter respectively 31.2 and 11 mm.…”

Section: Results Of Examinations and Their Analysismentioning

confidence: 99%

Archives of Metallurgy and Materials

Golański

Merda

Klimaszewska

et al. 2019

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The article provides results of the microstructure examinations and mechanical properties (hardness and microhardness tests) of the welded joint T91 steel taken from the live steam pipeline. Examined joint has been exploited for about 45 000 hours in a temperature of 535 o C and the steam pressure equals to 13.5 MPa. Examined joint was made as a double bead by the additional materials with a different chemical composition. It was proved that the joint was characterized by a differential microstructure on the cross-section of the weld. Moreover, decarburized zone in the lower alloyed material and carbides zone in the higher alloyed material were revealed in the weld line and on the boundary penetration of beads. Furthermore, it was shown that the main mechanism of a joint degradation is a privileged precipitation of carbides on the grain boundaries, and an increase of their size.

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Section: Results Of Examinations and Their Analysismentioning

confidence: 99%

Archives of Metallurgy and Materials

Golański

Merda

Klimaszewska

et al. 2019

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“…The above observations are in line with previous studies on the weldments of the similar alloys. 2,3,9) Micro-hardness values of the weld joint are measured in the vicinity of the weld area, in the direction perpendicular to the vertical center line of the weld joint indicated in Fig. 2, in the upper, middle and bottom region of the welded joint, with an interval of 120 µm, and are shown in Fig.…”

Section: Microstructure and Micro-hardnessmentioning

confidence: 99%

Nano-Indentation Creep Behavior of the Vacuum Electron Beam Weldment of 12Cr10Co3W2MoNiVNbNB Heat Resistant Steel

et al. 2021

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Creep behavior of the weldment of a new type of martensitic heat-resistant steel 12Cr10Co3W2MoNiVNbNB joined with vacuum electron beam welding is studied employing nano-indentation technique at room temperature. Different load-displacement curves are obtained for base metal, heat affected zone (HAZ) and weld metal of the welded joint. The creep displacement exhibits a sharp rise at first, then the creep rate continuously decreases with time, and is approaching zero at late steady-state creep. The creep rate of the weld is smaller than HAZ, than base metal for late creep stage. Overall, the indention stress decreases with increasing dwelling time for all the regions, and weld metal yields the greatest indention stress while the base metal has the lowest value. Weld metal exhibits the smallest creep strain rate sensitivity value, indicating it has the best room temperature creep resistance, probably due to the newly formed wide lath martensite. The weldment yields various microstructure for base metal, HAZ and weld metal, and wider martensite laths with a high dislocation density are found in the weld seam.

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“…There is an increasing need for materials that can operate under extreme conditions, specifically elevated temperatures. Iron–chromium (Fe-Cr) alloys are prime candidates with outstanding creep strength and heat resistance, for example, T91. , We may refer to superheaters in boilers, main steam pipelines, and heating furnace piping in the petrochemical industry as some of their current applications. , Fe-Cr alloys are also one of the prime candidate materials for nuclear fuel cladding, , specifically for Generation IV nuclear reactors with a life of 60+ years and operating in temperatures as high as 1000 K and extreme radiation doses because they have higher oxidation resistance compared to zirconium alloys. These emerging needs further emphasize the necessity of computational studies for Fe-Cr alloys, as experimental radiation tests are costly and require a minimum of 7 years of testing.…”

Section: Introductionmentioning

confidence: 99%

A Modified Embedded-Atom Potential for Fe-Cr-Si Alloys

et al. 2021

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We developed a modified embedded atom method (MEAM) potential for Fe-Cr-Si ternary systems. These alloys have superior corrosion and crack resistance, making them candidate materials for several engineering applications such as accidenttolerant fuel cladding. We used a multiobjective optimization approach to match Fe-Cr-Si's elastic constants, ground-state energies, and structural parameters with ab initio calculations. The potential has been parameterized by fitting to a set of literature values obtained using density functional theory (DFT) or experimental studies. The developed potential was used in molecular dynamics (MD) simulations to extract mechanical and thermal properties. We obtained the calculated elastic constants for Fe-Cr-Si binary interactions using the proposed potential, agreeing with ab initio calculations. Our calculated self-diffusion coefficient values and defect formation energy using this potential are in good agreement with the previous literature. Therefore, the developed potential can investigate the fundamental behaviors on an atomic scale under harsh conditions like elevated temperature and irradiation.

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Heat Strength Evaluation and Microstructures Observation of the Welded Joints of One China-Made T91 Steel

Cited by 15 publications

References 39 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Nano-Indentation Creep Behavior of the Vacuum Electron Beam Weldment of 12Cr10Co3W2MoNiVNbNB Heat Resistant Steel

A Modified Embedded-Atom Potential for Fe-Cr-Si Alloys

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