Effects of Microstructures and Mechanical Properties of Ferritic Ductile Iron by Increasing Inoculation Content

Author of the article:QUAN Zhen1 , XU Jinfeng1 , ZHAO Xinwu2 , HE Baolou1 , ZHAI Qiuya1

Author's Workplace：1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; 2. Xixia Internal Combustion Engine Intake and Exhaust Pipe Co., Ltd., Xixia 474500, China

Key Words：silicon content; solution strengthening; ferritic ductile iron; microstructure; mechanical properties

Abstract：The effect of inoculation and silicon addition treatment on microstructure and mechanical properties of ferrite ductile iron was studied under the condition of other technological factors unchanged. The results show that with the increase of inoculation amount of silicon, the graphite spheroidization rate decreases, the diameter of the spheroidization increases, the number of the spheroidization decreases, and the distribution uniformity becomes worse. Especially when the Si content is greater than 4.0%, it is easy to produce lumpy graphite and tends to intensify. At the same time, the tensile strength, yield strength and hardness of ductile iron tend to increase, while the elongation first increases and then decreases, and the impact toughness decreases monotonically.