Effect of the High-Temperature Deformation on the Ms Temperature in a Low C Martensitic Stainless Steel

• Published in: Journal of materials engineering and performance 2013, Vol.22 (2), p.345-350
• Main Authors: Alvarado-Meza, M. A., García-Sanchez, E., Covarrubias-Alvarado, O., Salinas-Rodriguez, A., Guerrero-Mata, M. P., Colás, R.
• Format: Article
• Language: English
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Cross-disciplinary physics: materials science; rheology; Elasticity. Plasticity; Engineering Design; Exact sciences and technology; Martensitic transformations; Materials Science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Quality Control; Reliability; Safety and Risk; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-012-0258-4

The effects of cooling rate and plastic deformation at 1100 °C on the start of the austenite-to-martensite transformation in a low carbon Fe-12Cr stainless steel were investigated by dilatometry and thermal analysis of pre-strained samples. The experimental M s was found constant (397.2 °C) for cooling rates between 15 and 30 °C/min. Outside this range, the M s apparently decreases as the cooling rate decreases below 15 °C/min or increases above 30 °C/min. An overall average value of 380.9 ± 11.8 °C was observed within the complete range of cooling rates investigated (8-40 °C/min). This value is 50 °C higher than that predicted from the chemical composition of the steel and Andrews’ equation for M s . Prior plastic deformation of austenite at 1100 °C increases the M s temperature and broadens the martensitic domain ( M f - M s ). This effect increases as the magnitude of the applied pre-strain increases.