Manufacturing Technology 2020, 20(5):684-689

Influence of Elevated Temperatures on the High-Strength X3NiCoMoTi 18-9-5 Maraging Steel Behavior

Angelina Strakosova, Alena Michalcová, Zdeněk Kačenka, Filip Průša, Dalibor Vojtěch
Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague. Tech-nická 5, 166 28 Prague. Czech Republic

High-strength X3NiCoMoTi 18-9-5 maraging steel belongs to highly researched materials due to its wide application range. Thanks to its outstanding mechanical properties, it is usually used for high-loaded parts in the aircraft and aerospace industry. Hardness and ultimate tensile strength are strong-ly affected by heat treatment allowing to create Ni3X (X = Mo, Ti), Fe2Mo, and (Fe, Ni, Co)3(Ti, Mo) precipitate which almost doubles their properties. In the present study, microstructure and mechani-cal properties of the thermo-mechanically processed maraging steel were studied two modes of heat treatment. Microhardness values improved from 350 HV0.1 to 650 HV0.1, and ultimate tensile strength has increased from 1029 up to 2140 MPa. On the contrary, elongation has reduced from 11 to 4 %. After heat treatment, precipitates Ni3Mo has been formed in the material volume.

Keywords: Maraging, Forging, Microstructure, Heat treatment, Precipitation hardening
Grants and funding:

Specific university research A1_FCHT_2020_003.
Research Infrastructure NanoEnviCz, Project No. LM2018124.

Received: August 27, 2020; Revised: November 16, 2020; Accepted: November 23, 2020; Prepublished online: November 23, 2020; Published: December 14, 2020  Show citation

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Strakosova A, Michalcová A, Kačenka Z, Průša F, Vojtěch D. Influence of Elevated Temperatures on the High-Strength X3NiCoMoTi 18-9-5 Maraging Steel Behavior. Manufacturing Technology. 2020;20(5):684-689.
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