Investigation on the Grain Growth of Fe-40Ni-Ti Austenitic Steel in Heating Process

Abstract:

Fe-40Ni alloy, keeping face-centred cubic structure (FCC) at room temperature, possesses similar stacking fault energy to that of austenite in steels at wide temperatures. The grain growth behavior of Fe-40Ni-Ti alloy at high temperatures was investigated by optical microscope and transmission electron microscopy (TEM). The results show that the grains grow very slowly from 880°C to 1160°C at holding time of 150min. At about 1220°C, the grain growing tendency can be clearly observed. At 1300°C, the rain size increases rapidly and coarsens when hold for 30min.TiN precipitates forms during the solidification and and strain induced precipitates can dissolve into the matrix, resulting in the grain boundaries moving easily. The evolution of dislocation configuration is retarded by the strain induced precipitates, which enhances the stabilization of dislocation cells.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 272-276
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.272
• Online since: April 2014
• Authors: Shao Qiang Yuan, Xiao Juan Zhang, Yue Hui Yang, Guo Li Liang
• Keywords: Fe-40Ni-Ti Alloy, Grain Growth, TiN Particles Strain Induced Precipitation

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