The kinetics of lath martensite formation in Fe-17·3 wt-%Cr-7·1 wt-%Ni-1·1 wt-%Al-0·08 wt-%C stainless steel was investigated with magnetometry and microscopy. Lath martensite forms during cooling, heating and isothermally. For the first time, it is shown by magnetometry during extremely slow isochronal cooling that transformation rate maxima occur, which are interrupted by virtually transformation free temperature regions. Microscopy confirms martensite formation after athermal nucleation of clusters followed by their time dependent growth. The observations are interpreted in terms of time dependent autocatalytic lath martensite formation followed by mechanical stabilisation of austenite during the transformation process.
Anomalous kinetics of lath martensite formation in stainless steel / Villa, M.; Hansen, M. F.; Pantleon, K.; Somers, M. A. J.. - In: MATERIALS SCIENCE AND TECHNOLOGY. - ISSN 0267-0836. - 31:11(2015), pp. 1355-1361. [10.1179/1743284714Y.0000000709]
Anomalous kinetics of lath martensite formation in stainless steel
Villa M.;
2015-01-01
Abstract
The kinetics of lath martensite formation in Fe-17·3 wt-%Cr-7·1 wt-%Ni-1·1 wt-%Al-0·08 wt-%C stainless steel was investigated with magnetometry and microscopy. Lath martensite forms during cooling, heating and isothermally. For the first time, it is shown by magnetometry during extremely slow isochronal cooling that transformation rate maxima occur, which are interrupted by virtually transformation free temperature regions. Microscopy confirms martensite formation after athermal nucleation of clusters followed by their time dependent growth. The observations are interpreted in terms of time dependent autocatalytic lath martensite formation followed by mechanical stabilisation of austenite during the transformation process.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
