Development of Nickel Alloys Based on Alloy 617 for Components in 700 °C Power Plants

Klöwer, J.; Husemann, R. U.; Bader, Maher A.

doi:10.1016/j.proeng.2013.03.247

Cited by 70 publications

(29 citation statements)

References 4 publications

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“…lower carbon content compared to Alloy 617. The alloy is melted and remelted in a vacuum furnace and the Boron concentration is very precisely controlled [14,15].…”

Section: Fig 3 Central Control and Processing Unit 4 Experimental Smentioning

confidence: 99%

Laser Multi-Pass Narrow-Gap Welding – A Promising Technology for Joining Thick-Walled Components of Future Power Plants

et al. 2019

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Today, the average worldwide efficiency of coal-fired power plants stands at about 33 percent. The consistent use of state of the art technologies would enable an increase of the average efficiency of up to 47 percent and thus a sharp reduction of greenhouse gas emissions. The importance of improvements in this field becomes apparent when reviewing e.g. plans in Europe in 2017 for new power plants to be built across the continent. About 44 percent of the envisaged 153 gigawatts are still to be generated by fossil-fuel power plants [1]. One technical solution is to increase the steam turbine inlet temperature to 700°C. This, however, requires the use of nickel-based superalloys. Only these alloys satisfy all the requirements with regard to high-temperature, corrosion and oxidation resistance and creep behavior [2], [3]. Due to their relatively poor machinability, forgeability and high material costs compared to the steel-based alloys they are to replace, a more effective welding technology is needed to overcome the disadvantages of conventional welding technologies, i.e. large quantities of filler metal required and high energy input per unit length resulting in distortion and the potential reduction of high-temperature properties.

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“…lower carbon content compared to Alloy 617. The alloy is melted and remelted in a vacuum furnace and the Boron concentration is very precisely controlled [14,15].…”

Section: Fig 3 Central Control and Processing Unit 4 Experimental Smentioning

confidence: 99%

Laser Multi-Pass Narrow-Gap Welding – A Promising Technology for Joining Thick-Walled Components of Future Power Plants

et al. 2019

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“…The foregoing will require the use of creep and heat resisting materials. Subjected to appropriate heat treatment, alloy INCONEL 617 can be successfully used in the fabrication of crucial boiler elements [4,5].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Procedure of the Assessment of the Quality of Welded Joints Made in Alloy INCONEL 617

Konieczna

2018

eBIS

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The development of the power engineering industry forces designers and material engineers to develop and implement new technologically advanced materials, including alloy INCONEL 617. There are numerous works concerning tests focused on the alloy microstructure, yet welded joints made of INCONEL 617 have not been discussed in detail. The description of the microstructure of welded joints provides designers, design engineers and welding engineers with knowledge enabling them to assess the service life and degradation of welded joints in elements made of INCONEL 617. The article presents the analysis and the assessment of the microstructure of TIG-welded joints made of nickel alloy INCONEL 617. The tests involved the use of light and scanning microscopy. Precipitates revealed in the tests were identified using EDS-based chemical composition microanalysis XRD-based phase analysis. The verification of the test results also required the performance of analysis carried out using the scanning transmission electron microscope. The tests revealed the presence of precipitates both in the base material and in the weld. The presence of precipitates including Cr(Mo)₂₃C₆ or Ti(CN) carbides increases the strength of the alloy, whereas identified dislocations and twins intensify the hardening effect.

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“…The high creep strength and good workability of this alloy mean that it is also now expected to be used for steam pipes of boilers at temperatures of 700 C in advanced ultra-supercritical (A-USC) thermal power plants [6][7][8] . There are several studies of the creep rupture strength 9,10) and precipitation behavior of the secondary phases [11][12][13][14][15][16][17] at 700 C to 800 C, which is the temperature range for A-USC.…”

Section: Introductionmentioning

confidence: 99%

Deformation Microstructure and Fracture Behavior in Creep-Exposed Alloy 617

2017

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Development of Nickel Alloys Based on Alloy 617 for Components in 700 °C Power Plants

Cited by 70 publications

References 4 publications

Laser Multi-Pass Narrow-Gap Welding – A Promising Technology for Joining Thick-Walled Components of Future Power Plants

Laser Multi-Pass Narrow-Gap Welding – A Promising Technology for Joining Thick-Walled Components of Future Power Plants

Comprehensive Procedure of the Assessment of the Quality of Welded Joints Made in Alloy INCONEL 617

Deformation Microstructure and Fracture Behavior in Creep-Exposed Alloy 617

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