منابع مشابه
Driving force for martensitic transformation in steels
recently determined LVl~ to be 111918 J mol-I at temperatures below 1000 K, and pointed out that their experimental data were free from various 'intercept effects' which had dogged earlier investigations. Similarly, for T<1000K, they deduced '\~s=51.44Jmol-IK-I. There seem to be no data on the variation of LVl~ or ,\~s as a function of x. However, Lobo and Geigerl found that LVll: and ,\S~S do ...
متن کاملStrong Bainitic Steels by Continuous Cooling Transformation
Using metallurgical models, three steels were designed to obtain carbide-free bainitic structures in the as-rolled condition. Experimental castings were hot-rolled in a pilot mill and their austenite decomposition kinetics were measured using dilatometry. Tensile and Charpy impact properties were measured and the microstructures were characterised using X-ray diffractometry, optical and scannin...
متن کاملFormation of Nanostructured Steels by Phase Transformation
A thermodynamic criterion is developed to define the finest grain size that can be achieved during phase transformation, as a function of the driving force, interfacial energies and the parent phase grain size. It is found that at large undercoolings below the equilibrium temperature, the grain size achieved in practice is far greater than predicted theoretically. This is because of the heat of...
متن کاملMartensitic transformation of individual grains in low-alloyed TRIP steels
E. Jimenez-Melero,* N.H. van Dijk, L. Zhao, J. Sietsma, S.E. Offerman, J.P. Wright and S. van der Zwaag Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands European Synchrotro...
متن کاملAnalysis of deformation induced martensitic transformation in stainless steels
Many studies monitoring the formation of martensite during the tensile deformation of austenite report data which are, in principle, affected by both the applied stress and the resulting plastic strain. It is not clear in these circumstances whether the transformation is stress induced (i.e. the stress provides a mechanical driving force) or whether the generation of defects during deformation ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ISIJ International
سال: 1994
ISSN: 0915-1559
DOI: 10.2355/isijinternational.34.927