Influence Factors for the Determination of Vermicular Graphite Ratio in Cast Iron Measured by Ultrasonic Method

Liu, Qingyi; An-li, Jiang; Wang, Junbo; Shi, Daming

doi:10.2320/matertrans.m2018083

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The experimental equipment were two longitudinal wave sensors with central frequency of 5 MHz, RITEC-RAM-5000 snap-nonlinear high energy ultrasonic testing system, an oscilloscope (Tektronix MDO3022, Beaverton, OR, USA), a microscope (Axio Scope.A1 and Cam MRc 5, Oberkohen, Germany), a thermostatic magnetic stirrer (MYP11-2A), a specially processed ASTM 1020 steel specimen with surface roughness less than 5 µm [21] and dimensions of 150 mm × 30 mm × 20 mm, four plastic sheets with thickness of 0.2 mm, a rubber head dropper with volume of 2 mL, and a precision pallet balance (DH-JCS).…”

Section: Experimental Materials and Equipmentmentioning

confidence: 99%

Experimental Study on Properties of Ultrasonic Coupling Agent with Graphene in NDT

et al. 2022

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An ultrasonic coupling agent, as an acoustic medium between the ultrasonic probe and the surface of the specimens, is indispensable in Nondestructive Testing (NDT). Whether it is liquid, air, or solid coupling agent, the problem of improving the efficiency of ultrasonic propagation in a coupling agent is one worth studying. Glycerol and hydrogels are two common liquid coupling agents in NDT. This study intended to investigate the effect of graphene addition on the performance of these coupling agents in NDT. Firstly, based on the theory of acoustic impedance matching, the authors established an index system to evaluate the performance of ultrasonic coupling agent by experiments. Secondly, hydrogel–graphene and glycerol–graphene composite coupling agents were prepared by adding three-dimensional graphene structure powders with mass fraction of 0.25%, 0.5%, 0.75%, and 1% to CG-98 hydrogel coupling agent and HG-99 glycerol coupling agent, respectively. Corresponding experiments were conducted on these composite coupling agents. Peak-to-peak value, attenuation coefficient, and energy value of first echo are calculated at different frequencies. The experimental results showed that graphene can significantly improve the ultrasonic propagation performance of hydrogel and glycerin coupling agents. In addition, when the mass fraction of graphene added was 0.75%, the coupling agent had the best performance. Finally, we measured the acoustic impedance values of the composite couplings with different graphene contents to demonstrate the reliability of the experimental results.

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Section: Experimental Materials and Equipmentmentioning

confidence: 99%

Experimental Study on Properties of Ultrasonic Coupling Agent with Graphene in NDT

et al. 2022

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“…The determination of the vermicular graphite ratio to ultrasonic methods parameters was published by authors (Liu et al, 2018) and (Tupaj et al, 2020). From their work results, the change in ultrasonic velocity is depending on the angle of graphite particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Parameters - the Shape of Graphite and Matrix on Change of Ultrasonic Wave Propagation Rate and Value of Attenuation in Graphitic Cast Irons

Belán

Tillová

Uhríčik

et al. 2023

Production Engineering Archives

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Despite the tendency of the current industry, especially the automotive industry, it is to use modern, light and super-strong materials based on Al or HSLA steels, the application of classic materials such as cast iron still makes sense, especially concerning price and excellent castability. The article presents one of the possible ways of using the ultrasonic non-destructive method in quality control and simplification of the identification of the type of cast iron concerning the change of parameters of ultrasound propagation in materials. The main criteria for assessing the quality and determining the type of graphite cast iron were considered to be the rate of propagation of ultrasound - cL and the value of attenuation - α, which vary depending on the shape of the graphite and matrix. Graphitic cast irons with different graphite shapes (lamellar, vermicular, and globular shapes) and a matrix with different ferrite/perlite ratios were used as experimental material. Along with the ultrasonic tests, a metallographic analysis was also performed to quantify the microstructure of cast irons.

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Characterization on vermicular graphite rate and tensile strength in vermicular graphite cast iron based on nonlinear ultrasonic technique

Tang,

Mao,

et al. 2024

Ultrasonics

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Influence Factors for the Determination of Vermicular Graphite Ratio in Cast Iron Measured by Ultrasonic Method

Cited by 3 publications

References 11 publications

Experimental Study on Properties of Ultrasonic Coupling Agent with Graphene in NDT

Experimental Study on Properties of Ultrasonic Coupling Agent with Graphene in NDT

Influence of Structural Parameters - the Shape of Graphite and Matrix on Change of Ultrasonic Wave Propagation Rate and Value of Attenuation in Graphitic Cast Irons

Characterization on vermicular graphite rate and tensile strength in vermicular graphite cast iron based on nonlinear ultrasonic technique

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