Thermal Stability of Athermal and Deformation Martensite in Ni27Ti2AlMoNb Steel

Tomasz Borowski; Maciej Kowalczyk; Jerzy Jeleńkowski

doi:10.4028/www.scientific.net/SSP.172-174.585

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Thermal Stability of Athermal and Deformation Martensite in Ni27Ti2AlMoNb Steel

Abstract:

The study was devoted to the thermal stability of the phases present in chromium-less and practically carbon-less Ni27Ti2AlMoNb steel. Steel with an austenitic structure was subjected to martensitic transformations using a thermal treatment, namely cooling to below the temperature M_s (beginning of the martensitic transformation), or by plastic deformation using the TRIP effect. The cooling in liquid nitrogen gave a martensitic-austenitic structure with athermal martensite α’_a. The martensite had a lenticular morphology, and its volumetric share was 51%, which is typical of duplex type steels. The 50% squeeze of the austenitic steel resulted in the formation of deformation martensite α’_d with a lamellar structure (this transformation is only possible below a certain temperature M_d). During the experiments, the thermal stability of the two phases, α’_a and α’_d, at temperatures of 450°C and 550°C was examined. The changes taking place in the steel structure when the athermal martensite and deformation martensite were annealed below and above the temperature A_s (beginning of the austenitic transformation) were observed using a vibrating sample magnetometer and an optical microscope.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

585-590

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.585

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Online since:

June 2011

Authors:

Tomasz Borowski, Maciej Kowalczyk, Jerzy Jeleńkowski

Keywords:

Athermal Martensite, Chromium-Less Austenitic Steel, Deformation Martensite, Thermal Stability, TRIP Effect

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