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Martensite start temperature and the austenite grain-size
Journal of Materials Science, 2010The dependence of the martensite start temperature on the austenite grain-size is modeled based upon aspects of martensite nucleation and validated by data reported in the literature. The results obtained support the view that grain boundaries provide an environment for the formation of martensite embryos in annealed austenite.
J. R. C. Guimarães, P. R. Rios
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Modeling the Effect of Austenite Grain Size Distribution on Austenite Decomposition Kinetics
Materials Science Forum, 2007The model of the γ→α transformation calculated with the CATRAN program is described. The expected effect of former austenite grain size on the transformation kinetics as well as the final microstructure is analyzed and compared with experimental data.
Andrej Samoilov +4 more
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Effect of Initial Grain Size on the Dynamic Recrystallization Behaviours of Austenite
Materials Science Forum, 2007The effect of initial grain size on the recrystallization behaviour of a type 304 austenitic stainless steel was investigated using hot torsion. Refinement of the initial grain size to 8 μm had a considerable effect on the flow curve shapes, peak and critical strains and also on DRX kinetics, compared with an initial grain size of 35 μm ...
Dehghan-Manshadi, A., Hodgson, P. D.
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JOM, 1987
This paper attempts to find a suitable technique for determining prior austenite grain size in mild steel such that it could be used over as wide a range of compositions and temperatures as possible. An effort is also made to trace the reasons behind the failure of any particular technique when applied beyond a specific temperature and composition ...
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This paper attempts to find a suitable technique for determining prior austenite grain size in mild steel such that it could be used over as wide a range of compositions and temperatures as possible. An effort is also made to trace the reasons behind the failure of any particular technique when applied beyond a specific temperature and composition ...
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The Effect of Austenitizing Temperature on Prior Austenite Grain Size in Martensitic Cast Steel
Solid State Phenomena, 2013The GX12CrMoVNbN9-1 (GP91) cast steel belongs to a new group of high-temperature creep resistant cast steels being introduced to the power industry. The cast steel is characterized by higher mechanical properties in comparison with the low alloy Cr – Mo or Cr – Mo – V cast steels used so far.
Grzegorz Golański +2 more
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The determination of austenite grain size in ferrous metals
Metallography, 1981Abstract A simple uncomplicated method is introduced to render the austenite grain boundaries visible at room temperature. The suggested method is inexpensive and time saving and may be used universally. This is demonstrated on eleven ferrous materials and a good reproducibility is shown.
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Different austenite grain size in nonuniformly deformed billets
Metal Science and Heat Treatment, 1991Grain growth in steels during carburizing or carbonitriding is often accompanied by the occurrence of a varied grain size. Authors explain this phenomenon by the presence of impurities and excess phases along grain boundaries which restrain their growth.
S. S. D'yachenko, E. A. Kuz'menko
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Effect of ultrasonic vibrations on grain size in austenite and pearlite
Metal Science and Heat Treatment of Metals, 19621. Ultrasonic vibrations applied during heating coarsen the austenite grain, and this leads to the formation of coarse acicular martensite. 2. The application of ultrasonic vibrations during cooling when the austenite is changing into pearlite helps to make the pearlite grain finer.
A. G. Vasil'yeva, T. Ye. Kobtseva
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Austenite grain growth kinetics and the grain size distribution
2009The aims of this work are to assess the kinetics of austenite grain growth, and to estimate the three dimensional grain size distribution. Measurements are to be used for the validation of a statistical model for the estimation of the kinetics of austenite grain growth during hot strip rolling.
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Austenitic grain size of hydroextruded high-speed steels
Metal Science and Heat Treatment, 19811. To obtain a fine and uniform austenitic grain size in hardening of hydroextruded steels, a post-deformation temper at 500°C is recommended. After hydroextrusion with large degrees of deformation (">30%), heating to temperatures close to the Ac1 point (750°C) with short holds (5–10 min) may be used. 2.
A. A. Lyadskaya +2 more
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