Influence of High Current-Density Impulses on the Stress-Strain Response and Microstructural Evolution of the Single Crystal Superalloy CMSX-4

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Demler, E. et al.: Influence of High Current-Density Impulses on the Stress-Strain Response and Microstructural Evolution of the Single Crystal Superalloy CMSX-4. In: Materials Research 21 (2018), Nr. 6, e20180428. DOI:

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Sum total of downloads: 120

Owing to the low formability of single-crystal nickel-based materials, single-crystal components are typically cast. Subsequently, a multi-stage heat treatment is carried out in order to partially compensate the dendrite segregation and to stabilize the precipitated gamma'-phase. Such components possess a high resistance to creep at elevated temperatures. Since it is known that electrical impulses can be used to increase the formability of various materials, the potential of an electrical high current-density impulse treatment was evaluated for forming of the high strength nickel-based superalloy CMSX-4. Heat treated and pre-deformed specimens were loaded in compression and subjected to short pulses with a high-current density of 2.3 kA/mm(2). Depending on the microstructural state, the material demonstrated work hardening or softening as a consequence of the impulse treatment. In addition, experiments were carried out on crept specimens to test whether the current-impulse treatment can be used to reverse creep-related segregation of alloying elements (raft formation). It was possible to observe a change in the concentration of the elements in the gamma/ gamma'-phase transition following the current-impulse treatment. In particular, a local increase in the gamma-forming elements Cr, Co and a decrease in the gamma'-forming elements Ta, Ti was observed after the impulse treatment.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Fakultät für Maschinenbau

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1 image of flag of Germany Germany 67 55.83%
2 image of flag of United States United States 27 22.50%
3 image of flag of China China 12 10.00%
4 image of flag of Sweden Sweden 3 2.50%
5 image of flag of France France 2 1.67%
6 image of flag of Canada Canada 2 1.67%
7 image of flag of Russian Federation Russian Federation 1 0.83%
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9 image of flag of Israel Israel 1 0.83%
10 image of flag of Austria Austria 1 0.83%
    other countries 3 2.50%

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