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Effect of Nb/V Alloying on the Microstructure and Mechanical Properties of SiMo Ductile Iron

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Abstract

Three kinds of SiMo ductile iron samples with Nb/V alloying were prepared by the sand casting method. The microstructure and mechanical properties were evaluated via optical microscopy (OM), scanning electron microscopy (SEM) and an electronic universal testing machine. The metallographic analysis showed that Nb/V addition had a negligible effect on the graphite morphology and nodularity of the SiMo ductile iron, but the pearlite content increased and the size of the ferrite decreased. There are many Nb/V-rich carbides inside the ferrite grains and at the interface of the pearlite in ductile iron containing Nb/V. The tensile testing results showed that the SiMo ductile iron sample with 0.17% V addition had better mechanical properties at room and high temperatures. For SiMo ductile iron, the tensile strength (Rm), yield strength (Rp0.2), elongation after fracture (A) and Brinell hardness at room temperature are 631 MPa, 442 MPa, 8.9% and 222 HBW, respectively. The Rm, Rp0.2 and A at 650 °C were 202 MPa, 131 MPa and 21.8%, respectively. The better high-temperature performance of the sample containing 0.17% V is mainly attributed to the ability of V element to promote the precipitation and refinement of carbides, which can effectively improve the high-temperature strength of the matrix.

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Acknowledgement

This work was supported by Key R&D Projects in Heilongjiang Province (GZ20220031), Reserve leader of the Leading Talent Team in Heilongjiang Province.

Funding

The funding was provided by Key R&D Projects in Heilongjiang Province, GZ20220031, Yicheng Feng

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Authors and Affiliations

  1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Yi Chao, Jiang Wenyong, Feng Yicheng, Guo Erjun, Wang Changliang & Wang Lei

  2. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, China

    Feng Yicheng, Guo Erjun & Wang Lei

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  1. Yi Chao
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  2. Jiang Wenyong
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Correspondence to Feng Yicheng.

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Chao, Y., Wenyong, J., Yicheng, F. et al. Effect of Nb/V Alloying on the Microstructure and Mechanical Properties of SiMo Ductile Iron. Inter Metalcast (2024). https://doi.org/10.1007/s40962-024-01285-w

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