Effect of thermo-mechanical treatment on toughness of 9Cr-W ferritic-martensitic steels during aging

Kunimitsu, Seiji; You, Yang; Kasuya, Naoki; Sasaki, Y.; Hosoi, Yuzô

doi:10.1016/0022-3115(91)90182-7

Cited by 21 publications

(12 citation statements)

References 6 publications

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“…The average value of d is measured as 0.25 m, d c ϭ (1 ϩ )d ϭ 0.6 m. Then, the effect of clustering on the strength can be calculated by using Eq. [2] and the result is plotted in Figure 10. Figure 10(a) shows how clustering influences the precipitate strengthening of the Laves phase, and Figure 10(b) illustrates the effect of Laves clustering on the yield strength (rms) of the material.…”

Section: A Effect Of Clustering Of Laves Particles On the Strengthmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Fe 2 W Laves phase is an important intermetallic component, which can significantly influence microstructures and microstructural stability as well as mechanical properties. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Conventionally, Fe 2 W Laves phase is often considered detrimental for steels since it reduces their toughness. [2][3][4][5][6] Kunimitsu et al [2] observed a decrease in toughness after Fe 2 W Laves phase precipitated in a 9Cr-2W steel.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Conventionally, Fe 2 W Laves phase is often considered detrimental for steels since it reduces their toughness. [2][3][4][5][6] Kunimitsu et al [2] observed a decrease in toughness after Fe 2 W Laves phase precipitated in a 9Cr-2W steel. Schafer [3] showed that precipitation of Laves phase embrittles a 8Cr-2W steel.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

2006

Metall Mater Trans A

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Precipitation of Fe 2 W Laves phase in a 12Cr-2W power plant steel is investigated by using transmission electron microscopy (TEM). Fe 2 W Laves phase is found to be coherent with the matrix and has a stacking fault structure. The influence of formation of Fe 2 W Laves phase on the yield strength of the steel is quantitatively evaluated. The modeling result indicates that the strengthening effect from the formation of Laves phase particles is diminished by the loss of solid solution strengthening of alloying elements, and, as a result, the strength of the steel remains similar. The effect of clustering and coarsening of Laves precipitates on the strength of the steel is also studied. It is showed that clustering and coarsening decreases the strengthening effect of Laves phase. The limitation of the modeling approach currently adopted is also discussed.

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Section: A Effect Of Clustering Of Laves Particles On the Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

2006

Metall Mater Trans A

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“…Up to now, it has been generally believed that Laves phase is responsible for the impact brittleness of 9-12Cr martensitic heat-resistant steels after long-term aging at elevated temperatures [8][9][10] . The earliest report could be traced back to the work of Hosoi and coworkers [11,12] , in which Laves phase was revealed to bring impact brittleness in a 9Cr-2Mo ferritic-martensitic steel because the absorbed energy upon impact decreased and the ductile-brittle transition temperature (DBTT) increased as the Laves phase started to precipitate. Kunimitsu et al reported this phenomenon in 9Cr-2W, 9Cr-2Mo and 9Cr-4W steels [12] .…”

Section: Introductionmentioning

confidence: 99%

“…The earliest report could be traced back to the work of Hosoi and coworkers [11,12] , in which Laves phase was revealed to bring impact brittleness in a 9Cr-2Mo ferritic-martensitic steel because the absorbed energy upon impact decreased and the ductile-brittle transition temperature (DBTT) increased as the Laves phase started to precipitate. Kunimitsu et al reported this phenomenon in 9Cr-2W, 9Cr-2Mo and 9Cr-4W steels [12] . Li has well reviewed this subject in his article [13] .…”

Section: Introductionmentioning

confidence: 99%

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Zhong

Wang

et al. 2015

Materials Science and Engineering: A

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The Effect of Long‐Term Ageing on Microstructural Properties and Laves Phase Precipitation of Welded P91 and P92 Steels

Junek

Svobodová

Horváth

et al. 2021

steel research int.

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Creep resistant 9% Cr steels are frequently used in civil engineering projects of supercritical coal‐fired power plants operating at temperatures of superheated steam around 610 °C. This work focus on analysis of microstructure degradation and degradation of mechanical properties of orbital narrow‐gap welding of P91 and P92 steels. Nowadays welding technology of orbital narrow‐gap using tungsten inert gas is not limited to welding of high‐pressure steam pipelines. This method is highly productive and efficient and leads to an increase in productivity, quality, and repeatability of welding process. It replaces the original method of manual welding with coated electrode into a standard bevel, which is a time‐consuming process that costs a high amount of weld metal. Welds are degraded at 650 °C/30 000 h without applied stress and the effect of degradation is evaluated across the weld based on the observed changes in microstructure and hardness. Attention is focused mainly on precipitation and coarsening of Laves phase in the main areas of heat affected zone (HAZ): coarse grain HAZ, fine grain HAZ, and intercritical HAZ. The results show that frequency and rate of Laves phase coarsening in the fine grain and coarse grain HAZ are higher than in the base material.

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Effect of thermo-mechanical treatment on toughness of 9Cr-W ferritic-martensitic steels during aging

Cited by 21 publications

References 6 publications

Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

The Effect of Long‐Term Ageing on Microstructural Properties and Laves Phase Precipitation of Welded P91 and P92 Steels

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