The effect of a prior short-term ageing on mechanical and creep properties of P92 steel

Sklenička, V.; Kuchařová, K.; Svobodová, Marie; Král, Pétr; Kvapilová, Marie; Dvořák, Jiří

doi:10.1016/j.matchar.2018.01.008

Cited by 35 publications

(23 citation statements)

References 44 publications

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“…Microstructure analyses using SEM and TEM microscopy confirmed our previously published results from detailed microstructural investigations carried out on the same CG and UFG P92 steel. In general, it was found that the prior austenite grain boundaries were decorated by a network of mostly coarse chromium M 23 C 6 carbides, which precipitate during tempering.…”

Section: Resultssupporting

confidence: 84%

“…Creep behavior, microstructure stability, and degradation of the creep properties of P92 steel are phenomena of major practical importance that often limit the performance of high‐temperature components. This has motivated extensive experimental creep studies and theoretical modeling of the creep mechanisms and microstructure evolution in P92 steel over the last two decades …”

Section: Introductionmentioning

confidence: 99%

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Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

et al. 2019

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Creep testing is conducted on an advanced martensitic‐ferritic creep‐resistant P92 steel (ASME Grade 92) to evaluate the effects of grain refinement and the predeformation impact after processing by severe plastic deformation (SPD), namely, by high‐pressure torsion and high‐pressure sliding. Constant‐load tensile creep tests are carried out in an argon atmosphere at 600 °C and under an applied stress ranging from 50 to 200 MPa. The results show that under the same creep loading conditions, the ultrafine‐grained (UFG) microstructure states after SPD processing exhibit higher minimum creep rate trueϵ˙m and creep fracture plasticity ϵf, but significantly shorter creep lives in comparison with the coarse‐grained (as‐received) state of the steel. These distinct differences between the coarse‐grained and UFG states are explained by the different deformation mechanisms that operate; creep behavior in a coarse‐grained state is controlled by the intragranular climb of dislocations, while creep in UFG states can be interpreted as the synergistic action of the dynamic recovery of free dislocations at high‐angle grain boundaries and grain boundary‐mediated deformation processes.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

et al. 2019

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“…The microstructure of the P91 steel typically consists of prior austenite grains, martensitic packets, blocks and laths, as well as the M23C6 and MX precipitates [26][27][28][29][30][31][32], which is illustrated schematically in Figure 1. The average grain size of the austenite structure varies between 10 and 60 µm, depending on the heat treatment history [33,34].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

Chen

Yang

Al-Abedy

et al. 2020

Materials Characterization

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This paper investigates the microstructural evolution and fracture mechanism of the P91 steel during small punch tensile tests. Disc specimens, 8 mm in diameter and 0.5 mm in thickness, were tested in a small punch test rig at 600 °C using a constant displacement rate of 2 µm/s.Interrupted small punch tensile tests were performed to investigate the microstructural evolution in different deformation regimes. Deformed specimens were characterised by scanning electron microscopy and electron backscatter diffraction. Microstructure characterisation showed that block boundary alignment occurred in the plastic deformation direction, before achieving the maximum punch load. It was revealed that the martensitic structure was recovered when the tests progressed. The elongation of recovered grains occurred after achieving the maximum punch load. In addition, it was shown that the voids tended to nucleate along the recovered grain boundaries and became elongated to align with the plastic flow within the specimen.

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“…Therefore, they are good candidate materials for ultra‐supercritical (USC) power plants, which demand high temperature and pressure. P91 and P92 steel, which are typical martensitic steels, can be utilized as structural materials for power plant components at 600°C to 620°C . However, the maximum operating temperature of those components needs to increase to 625°C to 650°C to improve further the efficiency, causing the traditional materials to become unsuitable .…”

Section: Introductionmentioning

confidence: 99%

“…P91 3 and P92 steel, 6,8,9 which are typical martensitic steels, can be utilized as structural materials for power plant components at 600°C to 620°C. 3,8 However, the maximum operating temperature of those components needs to increase to 625°C to 650°C to improve further the efficiency, causing the traditional materials to become unsuitable. 10,11 The G115 steel invented recently in China has much better mechanical properties at elevated temperature than P91 and P92 steel, and it can be utilized in 625°C to 650°C USC power plants.…”

mentioning

confidence: 99%

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

Tang

Jing

Zhao

et al. 2019

Fatigue Fract Eng Mat Struct

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Many components operate under creep‐fatigue loading causing an increasing need to learn the knowledge about creep‐fatigue crack growth (CFCG). The stress and microstructural evolution around the crack tip of G115 steel after CFCG were investigated. According to the finite element simulations, the variations of equivalent stress and stress triaxiality in the crack tip zone are presented. Furthermore, the evolutions of martensitic laths, dislocations, and precipitates were systematically studied through electron backscatter diffraction and transmission electron microscopy observations. The laths at the crack tip or under a larger hold time are wider than those remote from the crack tip or under a shorter dwell time. Meanwhile, the dislocation densities reduced significantly at the crack tip or under a larger hold time. The different variations of laths' width and dislocation densities resulted from the different stress triaxiality and creep strain. W‐rich Laves and Cu‐rich phases appeared during CFCG. The Laves phase coarsened rapidly because of the stress‐accelerated diffusion.

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The effect of a prior short-term ageing on mechanical and creep properties of P92 steel

Cited by 35 publications

References 44 publications

Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

Characterisation of deformation process and fracture mechanisms of P91 steel at 600 °C in small punch tensile testing

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

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