Identification of Precipitate Phases in an 11%Cr Ferritic/martensitic Steel after Short-term Creep

Zhou, Xiaoling; Xu, Zhiqiang; Shen, Yinzhong; Shi, Tiantian; Huang, Xi

doi:10.2355/isijinternational.isijint-2018-171

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…The 8Cr4Mo4V alloy, due to its outstanding mechanical properties and thermal stability, is currently widely used as the main bearings materials of aeroengines 8 . The macroscopic failure modes of aeroengine bearings typically include fatigue [9][10][11][12] , creep 13 , and wear [14][15][16] . Fatigue failure is caused by the formation and propagation of microcracks within the material under stress 12,17,18 .…”

Section: Introductionmentioning

confidence: 99%

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Cao,

Ma,

Gong

et al. 2024

Preprint

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8Cr4Mo4V, as an ideal choice for aeroengines bearing materials, involves multi-scale damage mechanisms of the fatigue crack failures. Herein, we propose a multi-scale analysis method to analyze the crack initiation and propagation damage mechanisms of 8Cr4Mo4V alloy. We find that different crystal orientations produce distinctly different damage mechanisms. The second phase doping also has different strengthening effects on the matrix following bypass and cut-through mechanisms. Meanwhile, the study of the polycrystalline model verified the micro-scale inverse Hall-Petch relation, where material strength decreases with grain refinement. Phase transitions caused by dislocations lead to stress concentration at specific grain boundaries, becoming the main inducer for the nucleation of initial voids. To address micro-to-macroscale-crossing issues, we constructed a large-scale mesoscopic molecular dynamics simulation and proposed an analytical formula to predict the relationship between average grain size and yield stress. Finally, we combine macroscopic experiments, crystallographic analyses, and atomic-scale characterization, verifying the combined action of dislocations and stacking faults leads to the failure of the material.

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Section: Introductionmentioning

confidence: 99%

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Cao,

Ma,

Gong

et al. 2024

Preprint

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“…The stability of the TMLS in the initial state is reached by the precipitation of M 23 C 6 carbides along all HABs and LABs of the TMLS, as well as MX carbonitrides (where M means V and/or Nb or their combination, X means C and/or N or their combination) randomly distributed in the ferritic matrix [5][6][7][8][9][10]. During creep at elevated temperatures, the precipitation of the fine Laves phase particles along both HABs and LABs also stabilizes the TMLS [11][12][13][14][15]. However, the fast growth of the Laves phase can cause the formation of cracks [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of a Re-Containing 10% Cr-3Co-3W Steel during Creep at Elevated Temperature

Fedoseeva,

Brazhnikov,

Degtyareva

et al. 2023

Metals

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Ten percent Cr steels are considered to be prospective materials for the production of pipes, tubes, and blades in coal-fired power plants, which are able to operate within ultra-supercritical steam parameters. The microstructural evolution of a Re-containing 10% Cr-3Co-3W steel with low N and high B content during creep was investigated at different strains at 923 K and under an applied stress of 120 MPa using TEM and EBSD analyses. The studied steel had been previously normalized at 1323 K and tempered at 1043 K for 3 h. In the initial state, the tempered martensite lath structure with high dislocation density was stabilized by M23C6 carbides, NbX carbonitrides, and M6C carbides. At the end of the primary creep stage, the main microstructural change was found to be the precipitation of the fine Laves phase particles along the boundaries of the prior austenite grains, packets, blocks, and martensitic laths. The remarkable microstructural degradation processes, such as the significant growth of martensitic laths, the reduction in dislocation density within the lath interiors, and the growth of the grain boundary Laves phase particles, occurred during the steady-state and tertiary creep stages. Moreover, during the steady-state creep stage, the precipitation of the V-rich phase was revealed. Softening was in accordance with the dramatic reduction in hardness during the transition from the primary creep stage to the steady-state creep stage. The reasons for the softening were considered to be due to the change in the strengthening mechanisms and the interactions of the grain boundary M23C6 carbides and Laves phase with the low-angle boundaries of the martensitic laths and free dislocations.

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Evolution of Precipitate Phases in Ferritic and Martensitic Steel P92 During Normalizing and Tempering

Fan

Shen

et al. 2022

JOM

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Identification of Precipitate Phases in an 11%Cr Ferritic/martensitic Steel after Short-term Creep

Cited by 4 publications

References 33 publications

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Microstructural Evolution of a Re-Containing 10% Cr-3Co-3W Steel during Creep at Elevated Temperature

Evolution of Precipitate Phases in Ferritic and Martensitic Steel P92 During Normalizing and Tempering

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