The Microstructure and Mechanical Properties of Novel MQ-P-T Processes Proposed to Ductile Iron Casting Ball with Different Composition

4th Annual International Workshop on Materials Science and Engineering

Shan, Kuankuan^1 ; Huang, Yu^2 ; Li, Hongpeng^1 ; Dong, Dashan^1 ; Jia, Xiaoshuai^1

Logistics Engineering College, Shanghai Maritime University, Shanghai

201306, China^1

Jiangxi Copper Group (Dexing) Foundry Co. Ltd., Dexing, Jiangxi

334200, China^2

关键词: Complex Processes;    Impact performance;    Mechanical performance;    Microscopic characterization;    Microstructure and mechanical properties;    Quenching-partitioning-tempering;    Toughening mechanisms;    Water quenching;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012110/pdf
DOI  :  10.1088/1757-899X/381/1/012110

来源: IOP

【 摘 要 】

Based on microstructure desired, ductile iron casting balls are treated by a multi-cycle quenching-partitioning-tempering (MQ-P-T) process, and such a complex process is performed by alternating water quenching and air cooling. The resultant microstructure is characterized and the effect of the heat treatments on the mechanical properties is evaluated. Compared to ductile iron casting iron samples, the hardness of MQ-P-T ductile iron balls has been significantly enhanced. After treated by MQ-P-T process, the impact performance of sample 1# reduces, while the impact performance of 2# and 3# increases. With the purpose of studying the root causes of the mechanical performance enhancement, this paper will further investigate the strengthening and toughening mechanism of MQ-P-T ductile iron casting balls by means of microscopic characterization technique, such as OM and XRD methods.