Model of idiomorphic ferrite growth in a vanadium-nitrogen steel

作者：Liu Hong Yu^*; Liu Jian Hua; Li Hai Bo; Chen Xiao Long; Wang Hong Li; Tang Li

来源：Materials Science and Technology, 2010, 18(6): 777-781.

• Austenization
• Calculated values
• Energy dispersive x-ray
• Ferrite growth
• Growth laws
• Idiomorphic ferrite
• Isothermal growth
• Isothermal time
• Metalloscope
• MnS inclusions
• Nitrogen steels
• Refining mechanisms
• Transformation temperatures
• V(C , N)

In order to investigate the refining mechanism of microstructures in vanadium-nitrogen steels, the sizes and nature of the inclusions were determined by means of scanning electron microscopy and its attached energy dispersive X-ray analysis unit. A model that described the isothermal growth of idiomorphic ferrite was built based on nucleation of inclusion. Based on this model, the volume fractions of idiomorphic ferrite, which were isothermally produced at 873 K, 823 K for different time after austenization, were calculated and compared with the results of metalloscope measurement. The results indicated that the model can well describe the growth law of idiomorphic ferrite. During the same isothermal time, the volume fraction of idiomorphic ferrite formed at 873 K was greater than that at 823 K. As the transformation temperature decreased, the calculated value of volume fraction of idiomorphic ferrite was smaller than measured value, which is resultant from more VN or V(C, N) particles not only precipitating on MnS inclusions, but also doing outside them as the nuclei of idiomorphic ferrite.

• 出版日期2010-12
• 单位武汉科技大学