Characterization of graphite size and surface hardness of ductile cast iron based on nonlinear ultrasonic technology

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 8-14.

TANG Yan1, MAO Hanling1,2, LIN Yongchuan1, MAO Hanying3, HUANG Zhenfeng1,2, LI Xinxin1,2

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Abstract

Ductile cast iron has excellent mechanical properties and is widely used in various industrial fields, the internal graphite morphology and distribution will affect the mechanical properties. Compared with the spheroidization rate of graphite, there is less research on the characterization of graphite size. It is of great engineering significance to evaluate the graphite size and surface hardness of ductile cast iron by a non-destructive method. Ductile cast iron specimens with different graphite sizes and matrix structures were poured, the metallographic observation and hardness test were carried out. Based on the critical refraction longitudinal (LCR) wave and surface Rayleigh wave models, the graphite size and surface hardness were characterized using acoustic wave velocity and ultrasonic nonlinear coefficient. The results show that the ultrasonic nonlinear coefficient of LCR wave increases with the increase of surface hardness and decreases with the increase of graphite size, and it has higher sensitivity than the ultrasonic velocity; The increase of LCR wave ultrasonic nonlinear coefficient is related to the increase of the number of graphite, grain boundaries, and carbides in the microstructure. Therefore, the graphite size and surface hardness of ductile cast iron can be characterized by the ultrasonic nonlinear parameter of the LCR wave, and the relationship between microstructure, ultrasonic nonlinear coefficient, and mechanical properties can be established.

Key words

ductile cast iron / nonlinear ultrasonic / graphite size / surface hardness / nonlinear ultrasonic parameter / acoustic wave velocity

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TANG Yan1, MAO Hanling1,2, LIN Yongchuan1, MAO Hanying3, HUANG Zhenfeng1,2, LI Xinxin1,2. Characterization of graphite size and surface hardness of ductile cast iron based on nonlinear ultrasonic technology[J]. Journal of Vibration and Shock, 2023, 42(15): 8-14

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