Structural changes of tempered martensitic 9%Cr–2%W–3%Co steel during creep at 650°C

Dudova, Nadezhda; Plotnikova, N. V.; Molodov, Dmitri A.; Belyakov, Andrey; Kaibyshev, Rustam

doi:10.1016/j.msea.2011.12.020

Cited by 120 publications

(151 citation statements)

References 31 publications

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“…This dispersion of secondary phase particles withstands short-term creep [4,9,15]. The Laves phase provides effective stabilization of TMLS and therefore promotes creep resistance, although their effect on the rearrangement of lattice dislocation is negligibly small [9,11,15]. However, the particles of Laves phase grow with a high rate under creep condition and, at present, these boundary precipitations are considered to be responsible for the creep ductility of the P92-type steels during long-term aging [16].…”

Section: Introductionmentioning

confidence: 99%

“…Stability of TMLS is provided by M 23 C 6 -type carbides and MX (where M is V and/or Nb, and X is C and/or N) carbonitrides precipitated during tempering at boundaries and within ferritic matrix, respectively, and boundary Laves phase particles precipitated during creep [1,2,[4][5][6][7][8][9][10][11][12]. MX carbonitrides, which are highly effective in pinning of lattice dislocations, play a vital role in superior long-term creep resistance of the high chromium martensitic steels, whereas boundary M 23 C 6 carbides and Laves phase particles exerting a high Zener drag force stabilize the TMLS [1,2,5,[7][8][9][10][11][12][13][14]. This dispersion of secondary phase particles withstands short-term creep [4,9,15].…”

Section: Introductionmentioning

confidence: 99%

“…MX carbonitrides, which are highly effective in pinning of lattice dislocations, play a vital role in superior long-term creep resistance of the high chromium martensitic steels, whereas boundary M 23 C 6 carbides and Laves phase particles exerting a high Zener drag force stabilize the TMLS [1,2,5,[7][8][9][10][11][12][13][14]. This dispersion of secondary phase particles withstands short-term creep [4,9,15]. The Laves phase provides effective stabilization of TMLS and therefore promotes creep resistance, although their effect on the rearrangement of lattice dislocation is negligibly small [9,11,15].…”

Section: Introductionmentioning

confidence: 99%

“…The enhanced long-term creep strength could be achieved by hindering this microstructural evolution. An effective way to achieve this goal is to slow down the diffusion-controlled processes, such as the climb of dislocations, knitting reaction between dislocation and lath boundaries, particle coarsening, etc., by such substitutional additives as Co, W, and Mo [1,9,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…It was recently shown that cobalt addition significantly hinders the coarsening of M 23 C 6 carbides and MX carbonitrides under creep conditions, which results in the superior creep resistance of martensitic steels [9,13,18,20]. This positive effect of Co is attributed to hindering diffusion within ferrite [9,18].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Tungsten on Creep Behavior of 9%Cr–3%Co Martensitic Steels

Fedoseeva

Dudova

Kaibyshev

et al. 2017

Metals

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Abstract:The effect of increasing tungsten content from 2 to 3 wt % on the creep rupture strength of a 3 wt % Co-modified P92-type steel was studied. Creep tests were carried out at a temperature of 650 • C under applied stresses ranging from 100 to 220 MPa with a step of 20 MPa. It was found that an increase in W content from 2 to 3 wt % resulted in a +15% and +14% increase in the creep rupture strength in the short-term region (up to 10 3 h) and long-term one (up to 10 4 h), respectively. On the other hand, in the long-term creep region, the effect of W on creep strength diminished with increasing rupture time, up to complete disappearance at 10 5 h, because of depletion of excess W from the solid solution in the form of precipitation of the Laves phase particles. An increase in W content led to the increased amount of Laves phase and rapid coarsening of these particles under long-term creep. The contribution of W to the enhancement of creep resistance has short-term character.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Tungsten on Creep Behavior of 9%Cr–3%Co Martensitic Steels

Fedoseeva

Dudova

Kaibyshev

et al. 2017

Metals

View full text Add to dashboard Cite

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Driving and Retarding Forces in Tempered Martensite Lath Structure

Fedoseeva

Dudova

Kaibyshev

2016

Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016)

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On the Cobalt − Tungsten/Chromium Balance in Martensitic Creep Resistant Steels

Zwaag

2017

steel research int.

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Recently, novel martensitic creep resistant steels strengthened by slowly coarsening Laves phase or stable M 23 C 6 precipitates have been identified both computationally and experimentally. The coarsening kinetics of these precipitates, traditionally considered to be very detrimental in creep steels, can be suppressed to a degree which makes them attractive strengthening factors by alloying such steels to high Cobalt levels. As high Co levels are undesirable for various reasons, in the present work, the characteristics of Laves phase and M 23 C 6 , in particular the volume fraction, coarsening rate, and precipitation strengthening factor, in newly designed alloys are computationally compared with those of existing Co-containing creep steels. The binary analyses of Co-M balance show that the Co-W levels are highly coupled for creep steels strengthened by Laves phase deposits and W can be used to partially replace Co to yield the same precipitation strengthening. For the M 23 C 6 strengthened alloys, irrespective of the Cr level, a high Co concentration is predicted to be necessary for a high creep resistance.

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Structural changes of tempered martensitic 9%Cr–2%W–3%Co steel during creep at 650°C

Cited by 120 publications

References 31 publications

Effect of Tungsten on Creep Behavior of 9%Cr–3%Co Martensitic Steels

Effect of Tungsten on Creep Behavior of 9%Cr–3%Co Martensitic Steels

Driving and Retarding Forces in Tempered Martensite Lath Structure

On the Cobalt − Tungsten/Chromium Balance in Martensitic Creep Resistant Steels

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