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ExplosiveTreatment Effect on Structure and Properties of (gamma+epsilon) Alloy on the Basis of Fe-Mn-Solid Solution

Borys M. Efros 3Natalya V. Shishkova 3V. V. Milyavskiy 1Natalya B. Efros 3Anatolii I. Deryagin 2

1. High Energy Density Research Center SA, IVTAN RAS, Izhorskaya 13/19, Moscow 127412, Russian Federation
2. Russian Academy of Sciences, Ural Division, Institute of Metal Physics, 18 S.Kovalevskaya str., GSP-170, Ekaterinburg 620219, Russian Federation
3. National Academy of Sciences of Ukraine, A.Galkin Donetsk Institute for Physics & Technology (DonPTI NASU), Roza Luxemburg 72, Donetsk 83114, Ukraine


The samples of Fe77.95Mn20Si2C0.05 alloy were quenched in water (from T=9500C) and were subjected to explosive treatment, created by explosive missile device evolving the pressure pulse ~45 GPa during 1 s. The extremely energy densities, high pressures, shear stresses at explosive treatment could initiate the various chemical reactions or phase transitions. Magnetometry methods allowing to fix and to run down even insignificant concentration changes of α -phase were used.
The initial samples without explosive treatment contain 0.7% α -phase after quenching according to hysteresis dependence of magnetization on magnetic field strength (H). The crystallites' size was estimated as about 300 nm according to coercitivity force. After explosive treatment (P=45 GPa) the ferromagnetic component in the sample becomes the smaller and with respect to magnetization corresponds to 0.2% α -phase content with crystallites' size about 150 nm. The temperature investigations with heating of samples up to 4600C result in weak decreasing of magnetization for both samples. Further heating up to T=6000C offered to determine of the Curie temperature (which runs 6500C of observed phase for both samples possible. And that was typical for α -phase.
Thus under missile explosive treatment α -phase content reduces one-third as large for Fe77.95Mn20Si2C0.05 steel with decreases of crystallites sizes. Probably this was stipulated by α -> γ inverse transformation initiated by high pressure and shear stresses.


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Presentation: poster at E-MRS Fall Meeting 2004, Symposium I, by Natalya V. Shishkova
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-05-13 21:41
Revised:   2009-06-08 12:55