Microstructural evolution of aged heat-resistant cast steel following strain controlled fatigue

Golański, G.; Zielińska‐Lipiec, A.; Mroziński, Stanisław; Kolan, C.

doi:10.1016/j.msea.2014.12.120

Cited by 16 publications

(11 citation statements)

References 12 publications

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“…Dubey et al attributed the softening to the significant coarsening of the fine subgrain structure induced by cyclic plastic deformation. Golański et al revealed that softening process of GP91 cast steel took place through the continuous decrease in the dislocation density by alignment and annihilation of the dislocations, and also by the transformation of lath microstructure into subgrain microstructure of lower energy configuration. Clearly, the microstructural evolutions have been comprehensively investigated, whereas, studies about correlating the cyclic softening behavior to the deformation analysis are rarely mentioned, although some studies have pointed out that the cyclic softening effect is directly correlated to the accumulated viscoplastic strain applied and the viscoplastic strain applied per cycle.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Low Cycle Fatigue of Ferritic–Martensitic P92 Steel: Effect of Temperature

Wang

Jiang

Gong

et al. 2015

steel research int.

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Isothermal, strain-controlled low cycle fatigue (LCF) tests of P92 steel are conducted in air at different temperatures ranging from 20 to 650 8C and various strain ranges to clarify the influence of temperature on its LCF behavior. A symmetrical triangular wave form and a constant 1.0 Â 10 À3 s À1 strain rate are employed for all the tests. Cyclic softening behavior is expressed in two ways: peak tensile stress in terms of cycle numbers and in terms of accumulated inelastic strain. Based on the definition of "inelastic ratio," correlation between the value of accumulated inelastic strain ( e in;II ) at the beginning of the second softening stage and the inelastic ratio can be distinctively divided into three regions. The modified cyclic plasticity model, in which a linear term is added into the isotropic hardening variable, is developed to simulate the stress-strain hysteresis loop and the cyclic softening curve. Additionally, parameters in the modified isotropic hardening variable at different temperatures are correlated to the cyclic softening phenomenon. Performances of the modified model are assessed by comparing predictions with experimental results. Good predictive capability of the modified constitutive model is obtained.[ Ã ] X.

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Section: Introductionmentioning

confidence: 99%

Characterization of Low Cycle Fatigue of Ferritic–Martensitic P92 Steel: Effect of Temperature

Wang

Jiang

Gong

et al. 2015

steel research int.

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“…Especially as the literature data (Ref 27,28) show that the main mechanism of strengthening in martensitic steels of the 9-12% Cr type is the strengthening with grain boundaries and the solution strengthening constituting, respectively, 33 and 29% of the yield strength increase. Nevertheless, in the longer term, these precipitates will be subject to the process of coagulation during service, which leads to a reduction of their number, assuming their constant volume fraction as per OstwaldÕs law (Ref 5,14,16). As a consequence, this will contribute to a decrease in their role as the subgrain growth inhibitor.…”

Section: Discussionmentioning

confidence: 99%

Effect of Long-Term Service on Microstructure and Mechanical Properties of Martensitic 9% Cr Steel

Golański

Zielińska‐Lipiec²,

Zieliński

et al. 2017

J. of Materi Eng and Perform

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The paper presents the results of research on the X10CrMoVNbN9-1 (T91) steel after long-term service. The material for testing was taken from a pipe section of a boiler superheater coil serviced for around 105,000 h at the temperature of 540°C, at the pressure of 12.5 MPa. A quantitative analysis including the measurement of mean diameter of subgrains and precipitates as well as the density of dislocations of the examined steel was performed by means of TEM. The microscopic tests of T91 steel were complemented with the results of tests on mechanical properties which included also the short creep tests. After service, the investigated steel was characterized by a retained lath microstructure of tempered martensite with fine subgrain and quite large density of dislocations as well as numerous precipitates. In the microstructure, apart from the particles of M 23 C 6 and MX (VX, NbC, V-wings), the precipitates of Laves phase and single particles of Z phase were revealed. It has been shown that the extent of degradation of the T91 steel microstructure was minor, which resulted from its low temperature of service. Performed tests of mechanical properties showed that these properties fulfilled the minimum requirements for this steel in the as-received condition. A favorable influence of fine precipitates of Laves phase on mechanical properties was observed. Moreover, an insignificant influence of single precipitates of Z phase on the creep resistance of the examined steel was stated.

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“…Starting from metallurgical [5][6][7], repair (i.e. welding) [8][9][10][11][12][13][14][15][16] and finishing on wear properties [17][18][19]. As the titanium content increases, so does the hardness of alloys, and on the test contents of 2 and 6 wt.…”

Section: Methodsmentioning

confidence: 99%

Research on Vibration Properties of Copper-Titanium Alloys

Burdzik

Lisiecki

Warczek

et al. 2016

Archives of Metallurgy and Materials

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The article addresses a method proposed for comprehensive research of vibration properties dedicated to new structural materials. The method in question comprises three-stage studies, thus enabling the related costs to be reduced on each stage of the process. Subjects of identification and assessment are both the properties and the material structure as well as numerically determined dynamic characteristics and actual vibration characteristics of materials. The article provides preliminary research results obtained for Cu-2Ti-1Co and Cu-6Ti-1Co alloys, the mechanical properties of which are very prospective. An additional advantage of the method proposed is the capability of identifying alloy types by application of non-destructive vibratory methods.

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Microstructural evolution of aged heat-resistant cast steel following strain controlled fatigue

Cited by 16 publications

References 12 publications

Characterization of Low Cycle Fatigue of Ferritic–Martensitic P92 Steel: Effect of Temperature

Characterization of Low Cycle Fatigue of Ferritic–Martensitic P92 Steel: Effect of Temperature

Effect of Long-Term Service on Microstructure and Mechanical Properties of Martensitic 9% Cr Steel

Research on Vibration Properties of Copper-Titanium Alloys

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