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Influence of intercritical tempering temperature on impact toughness of a quenched and tempered medium-Mn steel: Intercritical tempering versus traditional tempering.
- Source :
-
Materials Science & Engineering: A . Jan2018, Vol. 711, p484-491. 8p. - Publication Year :
- 2018
-
Abstract
- The influence of intercritical tempering temperature on impact toughness of quenched and tempered 0.05C-5.42Mn medium-Mn steel was studied and compared with traditional tempering. The experimental steel had high hardenability because of high Mn-content. Lath-like α'-martensite without retained austenite was obtained over a wide range of quenching rate of 0.5–30 °C/s, and the quenched steel showed high strength but low impact toughness. On intercritical tempering at 625 °C and 665 °C, the impact toughness was enhanced, as compared to traditional tempering at 570 °C. The reversed austenite enriched with Mn and C formed between the martensite laths was the underlying reason for the increased absorbed crack propagation energy, and the ductile-brittle transition temperature (DBTT) was reduced because of increased stability of reversed austenite. Compared to the steel tempered at 625 °C, the steel tempered at 665 °C contained more reversed austenite, but the reversed austenite was less stable because of reduced enrichment of Mn and C. The enrichment or depletion of Mn and C in austenite and martensite was thermodynamically studied by DICTRA. In striking contrast to the steels tempered between 625 and 665 °C, twinned martensite was formed in the steel tempered at high temperature of 700 °C, and the steel exhibited impact toughness lower than the quenched steel. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TEMPERING
*AUSTENITE
*MARTENSITE
*QUENCHED disorder (Quantum mechanics)
*STEEL
Subjects
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 711
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 126596947
- Full Text :
- https://doi.org/10.1016/j.msea.2017.11.072