Deformation-induced phase transitions in a high-carbon steel

The Mössbauer Spectroscopy Studies of ϵ to Cementite Carbides Transformation during Isothermal Heating from As-Quenched State οf High Carbon Tool Steel

“…As one could see, already in the sample tempered for 0.5 h, carbides precipitated from the martensitic matrix. The value of measured hyperfine magnetic field (≈ 243 kG) is slightly higher than the ones reported in the literature (230 ÷ 240 kG) [15]. It is most probably caused by a high participation of interphase boundaries -martensitic matrix, because the process of carbides has been only initiated.…”

“…On the account of a possibility of using the data from [11][12][13][14][15][16][17][18], concerning the value of the hyperfine field on 57 Fe nuclei, located in various ferromagnetic phases or in chemical compounds occurring in the steels, the easiest way was to attribute the individual components of the experimental Mössbauer spectra to phases and chemical compounds occurring in the microstructure of the tempered steel. Figure 2 presents changes in hyperfine magnetic field (H) for a component corresponding with iron carbides vs. tempering time.…”

“…5. In a case of small particles of carbides precipitations (large value of grain boundaries) quadrupole splitting is giving on a level 0.1 mm/s [15]. If carbides precipitations are large, QS is going down [19,20].…”

“…Many works [11][12][13][14][15][16][17][18] showed that the Mössbauer spectroscopy gives a possibility to obtain new data, which may help more detailed interpretation of the phenomena connected with phase transformations during tempering.…”

The Mössbauer Spectroscopy Studies οf Cementite Precipitations during Continuous Heating from As-Quenched State of High Carbon Cr-Mn-Mo Steel

“…Many works [9][10][11][12][13][14][15][16][17] showed that the Mössbauer spectroscopy gives a possibility to achieve new information which may help to facilitate more detailed interpretation of the phenomena connected with transformations on-going during tempering of hardened steel. In such cases, the Mössbauer spectroscopy can help to confirm whether cementite precipitations are present in the microstructure of steel.…”