Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

Zieliński, A.; Sroka, M.; Dudziak, T.

doi:10.3390/ma11112130

Cited by 29 publications

(16 citation statements)

References 18 publications

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“…The average γ phase precipitation size for superalloy 740H fabricated by electron beam smelting was (30 nm) and 42 nm for Inconel 740H prepared by the traditional vacuum induction melting plus vacuum arc remelting. Most of the phases were observed both in the delivery and creep tested alloy 740H has been described in an analogous investigation of aged alloy 740H [27,[29][30][31]. Fig.…”

Section: Resultsmentioning

confidence: 52%

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

et al. 2020

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The Inconel 740H alloy is used in the construction of pressure components of ultra-supercritical operating parameters. The paper presents the results of microstructure analysis after 1000 and 10 000 h ageing at 700 and 750 • C. Microstructure studies were made using scanning and transmission electron microscopy. Identification of precipitations was made using X-ray analysis of phase composition. The influence of ageing time on changes in microstructure and the precipitation process of the tested alloy were described. Presented research results are a material characteristic of new generation materials, which are used in the design of elements of pressure parts of boilers and diagnostics work during operation.

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Section: Resultsmentioning

confidence: 52%

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

et al. 2020

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“…This situation causes a reduction in critical resolved shear stresses (CRSSs) of slip systems and more slip systems being activated at ambient temperature, thus enhancing the Mg–Li deformation capacity in comparison with other Mg alloys [ 13 ]. One of the simplest and most useful techniques to enhance the mechanical characteristics of a metal’s structure is alloying or performing plastic deformation [ 14 ]. Currently, Mg–Li alloys are manufactured by thermoplastic deformation to enhance the mechanical properties of metallic structural materials to spread their application range [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

et al. 2020

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In this work, a systematic analysis of the hot deformation mechanism and a microstructure characterization of an as-cast single α-phase Mg–4.5 Li–1.5 Al alloy modified with 0.2% TiB addition, as a grain refiner, is presented. The optimized constitutive model and hot working terms of the Mg–Li alloy were also determined. The hot compression procedure of the Mg–4.5 Li–1.5 Al + 0.2 TiB alloy was performed using a DIL 805 A/D dilatometer at deformation temperatures from 250 °C to 400 °C and with strain rates of 0.01–1 s−1. The processing map adapted from a dynamic material model (DMM) of the as-cast alloy was developed through the superposition of the established instability map and power dissipation map. By considering the processing maps and microstructure characteristics, the processing window for the Mg–Li alloy were determined to be at the deformation temperature of 590 K–670 K and with a strain rate range of 0.01–0.02 s−1.

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“…To maintain the current level of production, it is estimated that each year the modernisation of units with a total capacity of at least 2000 MW is necessary. Therefore, the important issue to be resolved has become not only the condition assessment of the pressure section of boiler and forecast about its further safe service but also the design modernisation with selection and use of new materials allowing for construction and installation of new components [1][2][3][4][5][6][7][8][9][10]. The required increase in efficiency and extension of service time of the operating high-power units, i.e.…”

Section: Introductionmentioning

confidence: 99%

Creep Characteristics of Engineering Materials

Dobrzański¹,

Zieliński²

2020

Creep Characteristics of Engineering Materials

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The assessment of suitability for further service of the basic material and circumferential welded joints of primary steam pipelines made of 14MoV6-3 steel was made based on the determined characteristics of their mechanical properties and structure. The tests were carried out on materials after service significantly exceeding the design time and 200,000 h. The mechanical properties with respect to the determined class of structure for the basic and welded joint material were compared to the determined class of damage in accordance with the Institute for Ferrous Metallurgy's own classification of the condition of materials after service under creep conditions. The residual life and disposable residual life were determined based on short-term creep tests and referred to the class of existing structure and the class of damage. The assessment of the suitability of the basic and circumferential welded joint material for further service was made.

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Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

Cited by 29 publications

References 18 publications

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

Creep Characteristics of Engineering Materials

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