Studies on Martensite Transformation in a Metastable Austenitic Cr-Mn Stainless Steel

Abstract:

The influences of the heating rate and annealing duration on martensite formation and its reversion to austenite have been investigated in a 60% cold-rolled metastable high-manganese austenitic Type 204Cu stainless steel. A Gleeble 3800 thermomechanical simulator was used for dilatometric measurements. Cold-rolled steel pieces were either heated up to 1000 °C at various heating rates between 5 °C/s and 150 °C/s followed by quenching to room temperature, or heated and held at temperatures in the range of 450 620 °C for different durations between 0.1 600 s. In heating experiments, dilatation curves revealed an expansion of a specimen starting around 550 °C followed by contraction, both processes depending on the heating rate. These dimensional changes could be correlated to the formation and reversion of a ferromagnetic phase, α-martensite. Some martensite was also formed during isothermal holding in connection with tempering of the pre-existing α-martensite before the following reversion, as established by magnetic measurements. Tempering of martensite was revealed by microhardness behaviour, X-ray diffraction analysis and transmission electron microscopy.

• Periodical: Materials Science Forum (Volume 762)
• Pages: 424-430
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.762.424
• Online since: July 2013
• Authors: Anna P. Kisko, Ludovica Rovatti, R.D.K. Misra, Puspendu Sahu, Juho Talonen, L. Pentti Karjalainen
• Keywords: Athermal Martensite, Austenitic Cr-Mn Stainless Steel, Dilatometry, Dislocation Density, Isothermal Martensite, Microhardness, Strain-Induced Martensite, Tempering

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