Effect of tempering temperature on the stress rupture properties of Grade 92 steel

Maddi, Lakshmiprasad; Ballal, Atul; Peshwe, D. R.; Paretkar, R.K.; Laha, K.; Mathew, M.D.

doi:10.1016/j.msea.2015.05.062

Cited by 21 publications

(7 citation statements)

References 26 publications

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“…The thermodynamically stable M 23 C 6 -type carbides and M(C,N) carbonitrides precipitate at the boundaries of PAGs, packets, blocks and martensitic laths and within the martensitic matrix after tempering at temperatures that range from 750 to 780°C [1,22]. This dispersion of secondary phase particles plays a key role in superior creep strength of 9-12%Cr steels [1][2][3]26,[27][28][29]. The increase in the B content and the decrease in the N content significantly affect precipitation sequences during tempering, i.e., the chemical composition, morphology and distribution of particles in the transition and equilibrium phases [19,21].…”

Section: Introductionmentioning

confidence: 99%

“…Some dispersoids stabilize the tempered martensite lath structure (TMLS) under service conditions. However, tempered martensite embrittlement takes place after tempering at ∼500°C, or long-term embrittlement occurs at approximately 600°C service temperature [1,15,[20][21][22][23][24][25][26][27][28][29]. The shape, size distribution, origin and nature of second-phase particles in TMLS significantly affect the creep resistance of 9-12%Cr steels [1][2][3][4][5][6][7][8][9][10][11]21,[22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…However, tempered martensite embrittlement takes place after tempering at ∼500°C, or long-term embrittlement occurs at approximately 600°C service temperature [1,15,[20][21][22][23][24][25][26][27][28][29]. The shape, size distribution, origin and nature of second-phase particles in TMLS significantly affect the creep resistance of 9-12%Cr steels [1][2][3][4][5][6][7][8][9][10][11]21,[22][23][24][25][26][27][28][29]. The morphological characteristics and structural parameters of martensite depend on the tempering temperature and are also important for the creep strength [1,13,19,[21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Tempering behavior of a low nitrogen boron-added 9%Cr steel

Fedorova

Kostka

Tkachev

et al. 2016

Materials Science and Engineering: A

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The effect of tempering temperature on microstructure and mechanical properties was studied in a lownitrogen, high-boron, 9%Cr steel. After normalizing and low-temperature tempering, cementite platelets precipitated within the martensitic matrix. This phase transformation has no distinct effect on mechanical properties. After tempering at 500°C, M 23 C 6 carbides appeared in the form of layers and particles with irregular shapes along the high-angle boundaries. Approximately, 6% of the retained austenite was observed after normalizing, which reduced to 2% after tempering at 550°C. This is accompanied by reduction in toughness from 40 J/cm 2 to 8.5 J/cm 2. Further increase of the tempering temperature led to spheroidization and coagulation of M 23 C 6 particles that is followed by a significant increase in toughness to 250 J/cm 2 at 750°C. Three-phase separations of M(C,N) carbonitrides to particles enriched with V, Nb and Ti were detected after high-temperature tempering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tempering behavior of a low nitrogen boron-added 9%Cr steel

Fedorova

Kostka

Tkachev

et al. 2016

Materials Science and Engineering: A

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“…High stresses were responsible for the formation of dimples between the cavities where the material is separated (fractured). In the case of long-term ruptures at low stresses, precipitate coarsening was observed [36]. Ostwald ripening is the established mechanism for precipitate coarsening, meaning one precipitate grows at the expense of its surrounding finer precipitates [9,17].…”

Section: Fractographymentioning

confidence: 99%

Influence of normalizing and tempering temperatures on the creep properties of P92 steel

Maddi¹,

Ballal

Peshwe

et al. 2020

High Temperature Materials and Processes

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AbstractP92 steel is used as a piping material in ultra super critical power plants that can be operated at steam temperatures up to 650°C. The changes in the martensitic microstructure of P92 steel must be evaluated thoroughly before it is put into actual service. In this study, indigenously developed P92 steel was used. The steel was subjected to normalizing and tempering heat treatments in the range of 1,040–1,060°C and 740–780°C. The changes in the microstructure were evaluated and creep-rupture properties were studied at test temperatures of 600 and 650°C. Although normalizing temperatures influenced the microstructure and creep strength marginally, the change in tempering temperatures led to significant changes. The creep rupture strength at 600°C was influenced largely by the changes in the dislocation substructure, while the precipitation of Laves phases was a significant observation made for 650°C test temperature. Proposed mechanisms for the microstructural evolution and its consequences on the rupture life are discussed in this study.

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“…Extensive research has been devoted to the design and development of new grades for high temperature applications [11], such as P91 steel grade [12][13][14], which has been studied under different thermal treatments to analyse the precipitated phases and their influence on the mechanical properties. In the same context, and with the aim of further improving the creep resistance, P92 steel grade is developed [15,16] and investigated through the application of different thermal routes. Other efforts to increase the corrosion resistance in creep steels led to the development of grades with higher Chromium content [17].…”

Section: Introductionmentioning

confidence: 99%

New chromium steel grade for creep applications

Callejo

Barbero²,

Serna-Ruiz³

et al. 2022

Mater. Res. Express

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In this study, a novel Chromium steel grade (COIN2) is produced as a result of a new steel composition and an innovative heat treatment. This new steel grade COIN2 evolves from the P92 steel grade and other novel steel grade recently created by the authors (COIN), and represents an enhancement of hardness, tensile properties, and creep behaviour with respect to them, which validates the metallurgical strategy used for further research in order to increase the efficiency of power plants and thus reduce the CO2 emissions. The characterization reveals a significant property improvement with the innovative thermal treatment, contributing to the production of a novel and more competitive steel grade for creep applications.

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Effect of tempering temperature on the stress rupture properties of Grade 92 steel

Cited by 21 publications

References 26 publications

Tempering behavior of a low nitrogen boron-added 9%Cr steel

Tempering behavior of a low nitrogen boron-added 9%Cr steel

Influence of normalizing and tempering temperatures on the creep properties of P92 steel

New chromium steel grade for creep applications

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