Preparation of High-Nitrogen Ductile Iron by Injecting Nitrogen Gas in Molten Iron

Materials

卷:13

Jinchuan Jie¹  Lifeng Tong¹  Shichao Liu¹  Tingju Li¹ 

[1] Key Laboratory of Solidification Control and Digital Preparation Technology, School of Material Science and Engineering, Dalian University of Technology, Dalian 116000, China;

关键词: ductile iron;    nitrogen gas;    graphite morphology;    tensile strength;   

DOI  :  10.3390/ma13112508

来源: DOAJ

【 摘 要 】

High-nitrogen ductile iron (DI) was prepared by a new method of injecting nitrogen gas into molten iron and nodularizing treatment. The microstructure and mechanical properties of the as-prepared DI for different nitrogen gas injection periods were characterized. The graphite morphology gradually deteriorated with the increase in the nitrogen gas injection time. The maximum nitrogen and pearlite contents were obtained after 20 min of nitrogen gas injection, and the corresponding tensile strength and elongation of the DI were calculated as 492 MPa and 9.5%, respectively, which were 9.3% and 22% higher than those of the DI prepared without the nitrogen gas injection treatment, respectively.

【 授权许可】

Unknown