The recrystallization and oxidation of a Mn-containing interstitial free (IF) steel were investigated simultaneously using confocal scanning laser microscope (CSLM) under controlled atmosphere of Ar 95% and H2 5% (in volume percent) at different temperatures. It was found that the grain boundary played a significant role in controlling recrystallization and oxidation in overall oxidation kinetics of the steel. The surface morphology was composed of two networks along the original and new grain boundaries respectively, which did not coexist. The grain boundary moved in different directions with different velocities during annealing process. The recrystallization processes were studied by CSLM motion video through observing the moving grain boundary to estimate the time for 50% recrystallization, and the activation energy for recrystallization was therefore calculated. The oxidation mechanism was discussed through comparison of the fluxes among mass transfer of water vapor, dissociation of water vapor and outward diffusion alloying elements. The results indicated that the oxidation was controlled by the mass transfer from the bulk gas to the surface, or dissociation rate, or outward diffusion of manganese, which depended on the temperature to form a grain boundary ridge or groove.
参考文献
| [1] | |
| [2] | Ghosh P, Ghosh C and Ray RK. Precipitation in interstitial free high strength steels [J]. ISIJ International, 2009, 49(7):1080.[2] Ray RK, Jonas J J and Hook RE. Cold rolling and annealing textures in low carbon and extra low carbon steels[J]. Int. Mater. Rev., 1994, 39(4):129.[3] Olefjord I, Leijn W and Jelvestam U. Selective surface oxidation during annealing of steel sheet in H2/N2[J]. Appl. Surf. Sci., 1980, 6:241.[4] Zhang ZT, Sohn IR, Meier GH, Pettit JS and Sridhar S. Effect of alloying elements, water vapor content and temperature on the oxidation of interstitial-free steels [J]. Metallurgical and Materials Transaction B, 2009, 40:567.[5] Huin D, Flauder P, and Leblond JB. Numerical simulation of internal oxidation of steel during annealing treatments [J]. Oxidation of Metals, 2005, 64:131.[6] Grabke HJ, Leroy V and Viefhaus H. Segregation on the surface of steels in heat treatment and oxidation [J]. ISIJ international, 1995, 35(2):95.[7] Mahieu J, Cooman BCD, Maki J and Claeffens S. Hot-Dip Galvanizing of Al alloyed TRIP steels [J]. Iron and Steelmaker, 2002, 29:29.[8] Parezanovic I and Spiegel M. Influence of dew point on the selective oxidation of cold rolled DP and IF-steel [J]. Journal of corrosion science and engineering, 2003, 6:32.[9] Martinez C, Cremer R, Loison D and Servais JP. In-situ investiagtion on the oxidaiton behavior of low alloysed steels annealed under N2-5%H2 protective atmosphere [J]. Steel Research, 2001, 72:508.[10] Grabke HJ. Surface and grain boundary segregation on and in iron and steels [J]. ISIJ International, 1989, 29:529.[11] Grabke HJ, Leroy V and Viefhaus H. Segregation on the surface of steels in heat treatment and oxidation [J]. ISIJ International, 1995, 35:95.[12] Carter GF. Priciples of physical and chemical metallurgy [M]. American society for metals. Metal Park, Ohio, 1979 :177.[13] Zhang ZT, Balaji S, Sohn IR, Ydstie BE and Sridhar S. Influence of fast path diffusion on the oxidation of Mn strengthened IF steels [J]. Defect and Diffusion Forum, 2009:432-438.[14] Yu YN. Priciples of physical and chemical metallurgy[M]. Metallurgical Industrial press, Beijing, 1999:428.[15] Kaur I and Gust W. Fundamental of grain and interface boundary diffusion [M]. Ziegler press, Stuttgart, 1989:127.[16] Porter DA and Easterling KE. Phase transformations in metals and alloys [M]. Second Edition, Taylor and Francis, 2004: 103.[17] Nakano J, Sridhar S, Moss T, Bennett J and Kwong KS. Crystallization of synthetic coal-petcoke slag mixtures simulating those encountered in entrained bed slagging gasifiers [J]. Energy and Fuels, 2009, 23: 4723.[18] Bird RB, Stewart WE and Lightfoot EN. Transport Phenomena [M], Second Edition, John Wiley, 2002[19] Nagasaka T and Fruehan TJ. Kinetics of the reaction of H2O gas with liquid iron [J]. Metall. Mater. Trans. B, 1994, 25: 245.[20] Fruehan RJ, Belton GR, Mannion FJ and Sasaki Y. Rate of decarburization of Fe-Csat melts by H2O at 1523 and 1873 K [J]. Metall. Trans., B, 1992, 23(1):45.[21] Wagner C. Reaction types in the oxidation of alloys [J]. Z. Elektrochemie, 1959, 63:772. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%