Low-Cycle Fatigue Properties of P92 Ferritic-Martensitic Steel at Elevated Temperature

Zhang, Zhen; Hu, Zhang; Schmauder, Siegfried; Mlikota, Marijo; Fan, K.L.

doi:10.1007/s11665-016-1977-8

Cited by 47 publications

(19 citation statements)

References 44 publications

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“…This also meant that the softening ratio and the increasing inelastic strain were closely linked, which could be shown by further evaluating the data in Figure 20. For the LCF-tests, the increase of inelastic The results regarding the lifetime, softening ratio, and maximum stresses of the LCF-tests were in a good agreement with the results obtained by Zhang et al [23] and Wang et al [15]. It should be mentioned that the tests results of the LCF-tests at 300 • C, in this work, were similar to those obtained at room temperature by Zhang et al, which showed in the values of the softening ratio and the constants of the Basquin Manson-Coffin relationship.…”

Section: Softening Behaviorsupporting

confidence: 89%

“…To soften the material and to precipitate fine carbonitrides, a tempering treatment follows, leading to partial rearrangement of dislocations and formation of subgrains. The as-received microstructure is shown in Figure 1 a and in Figure 1b; a schematic view of the typical substructure of a prior austenite grain is shown based on [23]; corresponding schemes have also been suggested elsewhere [6,24]. The prior austenite grains, which are transformed to a ferritic condition during tempering, still exhibit signs of the previous hierarchical martensitic structure with packets, blocks, and elongated cells that are often denominated as "laths".…”

Section: Introductionmentioning

confidence: 90%

“…• 100 (8) σmax is the overall maximum stress of the complete test, whereas σmax,50%Nf is the maximum stress of the stabilized cycle at half-lifetime. The equation was adapted from References [15,23], which used the maximum stress of the first cycle (see chapter 4. Discussion).…”

Section: Cyclic Stress Response Behavior Of the Lcf-testsmentioning

confidence: 99%

“…From there on, a nearly similar softening trend was apparent for all tests. In other studies on ferritic-martensitic steels, [e.g., 15,23], the softening ratio was often calculated on the basis of the maximum stress of the first cycle, neglecting the possibility that the global maximum stress was reached in a later cycle. If the maximum stress of the first cycle is taken for calculation, the softening ratio, in the present work, would result in values of 29.9% (for the RF-test at 620 °C and This leads to the question of why the initial hardening took place at smaller strain amplitudes.…”

Section: Softening Behaviormentioning

confidence: 99%

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Low Cycle Fatigue and Relaxation Performance of Ferritic–Martensitic Grade P92 Steel

Jürgens

Olbricht

Fedelich

et al. 2019

Metals

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Due to their excellent creep resistance and good oxidation resistance, 9-12% Cr ferritic-martensitic stainless steels are widely used as high temperature construction materials in power plants. However, the mutual combination of different loadings (e.g., creep and fatigue), due to a "flexible" operation of power plants, may seriously reduce the lifetimes of the respective components. In the present study, low cycle fatigue (LCF) and relaxation fatigue (RF) tests performed on grade P92 helped to understand the behavior of ferritic-martensitic steels under a combined loading. The softening and lifetime behavior strongly depend on the temperature and total strain range. Especially at small strain amplitudes, the lifetime is seriously reduced when adding a hold time which indicates the importance of considering technically relevant small strains.2 of 25 microstructure, by a formation of equiaxed dislocation cells and carbide coarsening, was observed, after only few hours of fatigue loading [5].In the following decades, the fatigue behavior and microstructure evolution have been investigated in more detail in P91 [6,7], as well as in other 9-12% Cr-steels [8][9][10]. The topic of combined loading (creep-fatigue) has been extensively studied for P91 [11]. Generally, these studies confirmed the above-mentioned trends and indicated qualitatively similar behaviors for all ferritic-martensitic steel grades. However, the number of studies dealing with fatigue and creep-fatigue of these materials is still quite limited, compared to the great efforts spent on characterizing the creep behavior [12], especially when considering the large parameter fields which would need to be covered for a thorough analysis of the material behavior, under the different combined loadings. Consequently, the amount of available fatigue data is quite restricted, as is reflected, for example, in the number of creep data and fatigue data sheets provided by NIMS in Japan [13].Recently, combined loading involving creep and cyclic fatigue loads has received increased attention due to the more flexible operation of power plants in many countries. Consequently, reliable data on the fatigue and creep-fatigue behavior are required for current construction materials. Since cyclic operation may especially affect thick-walled components (due to the build-up of thermal stresses [1]), the common material grades for live steam piping, headers, etc., need to be comprehensively tested. One current candidate material is P92, an optimized version of the 9% Cr grades with an increased tungsten content. Due to its enhanced creep resistance, compared to earlier grades, P92 can be used up to maximum operation temperatures of 620 • C [14]. A number of studies on the fatigue behavior of P92 have been published recently [15][16][17][18]. It was found that P92 exhibits a considerable cyclic softening, as it is known from P91. No quantitative comparison of the effect was given but it was confirmed that softening depends on a number of parameters, like the amount of plastic s...

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Section: Softening Behaviorsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 90%

Section: Cyclic Stress Response Behavior Of the Lcf-testsmentioning

confidence: 99%

Section: Softening Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Low Cycle Fatigue and Relaxation Performance of Ferritic–Martensitic Grade P92 Steel

Jürgens

Olbricht

Fedelich

et al. 2019

Metals

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“…A series of research and studies on the fatigue behavior of 9Cr ferritic-martensitic steel has been carried out. 6,7 Meanwhile, published data on fatigue properties of P92 steel, especially the influence of strain amplitude on cyclic plasticity and fatigue crack growth, are scarce. As part of this research, this paper focuses on the LCF properties and numerical investigations of P92 steel.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of low‐cycle fatigue behavior of 9Cr ferritic‐martensitic steel at room temperature

Zhang

et al. 2020

Mat Design & Process Comms

Self Cite

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The low‐cycle fatigue (LCF) behavior of 9Cr ferritic‐martensitic steel has been investigated over a range of controlled total strain amplitudes from 0.25 to 0.8% at room temperature (RT). The LCF properties of P92 steel at RT follow Coffin‐Manson relationship. Cyclic stress response of the P92 steel at RT contains three stages, in which the rapid softening and saturation part of cyclic softening stage can be described by the nonlinear isotropic/kinematic hardening model, and the softening rate and strength are enhanced with the increase of strain amplitudes. The influence of strain amplitude on the fatigue crack growth has been studied by using a scanning electron microscope, and it shows that the number of fatigue sources and secondary cracks increase with the increase of strain amplitudes.

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Simulation of Cyclic Deformation Behavior of Ferritic P92 Steel Based on Unified Viscoplastic Model

Wang

Zhang

Gong

et al. 2018

Proceedings of the 7th International Conference on Fracture Fatigue and Wear

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Low-Cycle Fatigue Properties of P92 Ferritic-Martensitic Steel at Elevated Temperature

Cited by 47 publications

References 44 publications

Low Cycle Fatigue and Relaxation Performance of Ferritic–Martensitic Grade P92 Steel

Low Cycle Fatigue and Relaxation Performance of Ferritic–Martensitic Grade P92 Steel

Experimental and numerical investigation of low‐cycle fatigue behavior of 9Cr ferritic‐martensitic steel at room temperature

Simulation of Cyclic Deformation Behavior of Ferritic P92 Steel Based on Unified Viscoplastic Model

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