Effect of PWHT on the dissolution of δ-ferrite in the welded joint of 12Cr–1Mo steels for steam turbines

Alcantar-Mondragón, N.; Reyes-Calderón, F.; García-García, V.; Vázquez–Gómez, Octavio; Salgado-López, J. M.

doi:10.1016/j.jmrt.2020.12.071

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…As a consequence, grains of δ-ferrite surrounded by lath martensite are preserved in the samples where the melting of the upper boundary of the hardened zone did not take place [13]. Therefore, the microstructure of the melting zone after hardening consisted of rack martensite, coarse δ-ferrite and α-ferrite and partial content of γ-austenite [14][15][16][17][18]. The content of martensite throughout the hardened zone was 50-55%, the second phase ferrite and a small proportion of retained austenite Table 4.…”

Section: Microstructure Analysismentioning

confidence: 99%

Investigation of the Technological Possibility of Laser Hardening of Stainless Steel 14Cr17Ni2 to a Deep Depth of the Surface

Somonov

Tsibulskiy

Mendagaliev

et al. 2021

Metals

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The article presents the results of a research of the process of laser hardening of steel 14Cr17Ni2 (AISI 431) by radiation of a high-power fiber laser LS-16. Assessment of the theoretically possible maximum depth in laser processing without additional beam transformations, the use of additional coatings and devices were shown. The results of experiments on increasing the depth of the hardened layer during laser processing by using scanning of the laser beam and optimally selected mode parameters without scanning are demonstrated. The influence of the number of passes on the depth of the hardened layer is investigated. The microstructure of hardened samples was studied and quantitative estimation of structural components was carried out. The microhardness of hardened samples at different modes of laser hardening was measured.

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Section: Microstructure Analysismentioning

confidence: 99%

Investigation of the Technological Possibility of Laser Hardening of Stainless Steel 14Cr17Ni2 to a Deep Depth of the Surface

Somonov

Tsibulskiy

Mendagaliev

et al. 2021

Metals

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“…Tan et al [25] investigated the effect of welding residual stress on operating stress in designing a nuclear turbine welded rotor. Alcantar-Mondragón et al [26] determined the optimal post-weld heat treatment parameters for 12Cr-1Mo steel, commonly used to manufacture HP steam turbine diaphragms. Emonts et al [27] studied the thermoelastic deformation of a large scale turbine housing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Manufacturing Processes on Blade Throat Size and Position in a Steam Turbine Diaphragm

Eret¹,

Hoznedl²

2022

Journal of Machine Engineering

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Despite a sustainable energy future, steam turbines are requisite for the reliability and security of the electric power supply in many countries. Accurate and precise manufacturing of the steam path is crucial to turbine efficiency. Before entering the rotor blades, the steam must be correctly guided using stationary blading in a diaphragm. Steam turbine diaphragms are complicated components to manufacture, and welding is the most common fabrication method. A case study presented in this paper employs data from a 3D optical scanner for a geometric deviation analysis of the upper half of the diaphragm at two production steps, after complete welding and after final machining. Unrolled cylinder cross-sections at different diameters are used to evaluate the blade throat sizes and positions compared to the nominal geometry. The results indicate significant geometric changes between the two fabrication steps, and several suggestions are put forward for targeted future work.

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Cooling Rate Dependency of Retained δ-Ferrite in the Coarse-Grained Heat-Affected Zone of P92 Heat-Resistant Steel

Liu,

Zhong,

Panteleyenko

et al. 2024

Metall Mater Trans A

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Effect of PWHT on the dissolution of δ-ferrite in the welded joint of 12Cr–1Mo steels for steam turbines

Cited by 6 publications

References 39 publications

Investigation of the Technological Possibility of Laser Hardening of Stainless Steel 14Cr17Ni2 to a Deep Depth of the Surface

Investigation of the Technological Possibility of Laser Hardening of Stainless Steel 14Cr17Ni2 to a Deep Depth of the Surface

Effect of Manufacturing Processes on Blade Throat Size and Position in a Steam Turbine Diaphragm

Cooling Rate Dependency of Retained δ-Ferrite in the Coarse-Grained Heat-Affected Zone of P92 Heat-Resistant Steel

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