Effect of the Austenitizing Temperature on Microstructure Evolution and Impact Toughness of a Novel Bainite Ductile Iron

Yongjin Wang; Yingchao Zhang; Renbo Song; Liang Huang; Yu Pei

doi:10.1007/s12540-020-00893-5

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자료유형: 학술저널

저자정보: Yongjin Wang (University of Science and Technology Beijing) Yingchao Zhang (University of Science and Technology Beijing) Renbo Song (University of Science and Technology Beijing) Liang Huang (University of Science and Technology Beijing) Yu Pei (University of Science and Technology Beijing)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10

발행연도: 2021.10

수록면: 4,014 - 4,022 (9page)

DOI: 10.1007/s12540-020-00893-5

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The effect of austenitizing temperature on microstructure evolution and impact toughness of a newly developed Fe?3.0C?2.8Si?2.0Mn?0.9V?0.2Cr bainite ductile iron was investigated in this research. The ductile iron specimens were heat treatedunder different continuous cooling process, involving austenitizing between 900 and 980 °C and followed tempering at200 °C. Optical microscopy, X-ray diffraction, scanning electron microscope and transmission electron microscope tests wereconducted to investigate the microstructure evolution. Impact toughness and Rockwell hardness were measured. The resultsshowed that the microstructure of the ductile iron mainly consisted of graphite, acicular bainite and retained austenite aftercontinuous cooling process. The austenitizing temperature could change the volume fraction and size of bainite and retainedaustenite. There existed a C-area, where retained austenite accumulated near the graphite, except for specimen austenitizedat 920 °C. The impact toughness of specimens increased first and then get worse with the increasing of austenitizing temperature. The impact toughness was related with the volume fraction of bainite and the morphology of retained austenite. The fracture mechanism of the bainite ductile iron belonged to cleavage fracture. Chunky graphite acted as the source ofmicrocrack during the impact process. The bulky retained austenite behaved as a prior path for the microcrack propagation,while the bainite and thin filmy retained austenite limited its propagation.

#Ductile iron #Bainite #Retained austenite #Impact toughness

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참고문헌 신청

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