On the correlation between microstructural evolution and ultrasonic properties: a review

Toozandehjani, Meysam; Матори, Хамирул Амин; Ostovan, Farhad; Mustapha, Faizal; Zahari, Nur Ismarrubie; Oskoueian, Arshin

doi:10.1007/s10853-015-8855-x

Cited by 81 publications

(24 citation statements)

References 119 publications

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“…The evaluation of the microstructural changes during the simulated heat treatment of the hot stamping process is done using a laser-ultrasonic technique. This measurement principle is based on the interaction between a laser-generated ultrasound impulse and the sample material [ 22 ]. For this purpose, a LUMet system from Dynamic Systems Inc. (Poestenkill, NY, USA) and Tecnar (Saint-Bruno-de-Montarville, Canada) is used, which is directly coupled to the thermomechanical simulator Gleeble 3500-GTC (Dynamic Systems Inc., Poestenkill, NY, USA).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Horn

Merklein

2021

Materials

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Prior carburization of semi-finished steel sheets is a new process variant in hot stamping to manufacture parts with tailored properties. Compared to conventional hot stamping processes, a complex phase typed steel alloy is used instead of 22MnB5. Yet recent investigations focused on final mechanical properties rather than microstructural mechanisms cause an increase in strength. Thus, the influence of additional carburization on the microstructural evolution during hot stamping of a complex phase steel CP-W®800 is investigated within this work. The phase transformation behavior, as well as the grain growth during austenitization, is evaluated by in-situ measurements employing a laser-ultrasound sensor. The results are correlated with additional hardness measurements in as-quenched condition and supplementary micrographs. The experiments reveal that the carburization process significantly improves the hardenability of the CP-W®800. However, even at quenching rates of 70 K/s no fully martensitic microstructure was achievable. Still, the resulting hardness of the carburized samples might exceed the fully martensitic hardness of 22MnB5 derived from literature. Furthermore, the carburization process has no adverse effect on the fine grain stability of the complex phase steel. This makes it more robust in terms of grain size than the conventional hot stamping steel 22MnB5.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Horn

Merklein

2021

Materials

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“…to characterize the microstructure changes and mechanical properties of steel strips due to high temperature or heat treatment. All these technologies have advantages and disadvantages [7]. Scholars [8]- [11] have used the ultrasonic method to measure the change of phase composition and the grain size of carbon steel, and results indicate that the sound velocity and attenuation method of ultrasound can provide information on the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Microstructures in Bias Weld of Coiled Tubing Steel Strip With Multi-Frequency Eddy Current Testing

et al. 2020

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Coiled tubing technology is widely used in drilling and repairing operations, and the quality of bias weld directly determines the fatigue life of the coiled tubing. The microstructures consistency between the bias weld and the base metal determines that whether the fatigue resistance of the weld reaches the level of the base metal. In this paper, multi-frequency eddy current testing technique is used to detect the reactance of the bias weld zone and the base material zone within coiled tubing steel strip, which can be used to determine the microstructure consistency between the base metal area and the weld area, and in turn to improve the welding technology and heat treatment process. In this work, CT100 and CT90 materials with the bias weld for coiled tubing were used as the test samples, and the on-line real-time non-destructive testing technology was used to judge whether welding technology and heat treatment technology have been improved. The basis for determination is whether the mechanical properties and fatigue properties of the welding site reach the base material level. The weld zone and base metal zone can be identified by analyzing the characteristic cloud map of the detection signal, and then the quality of partial weld can be evaluated according to the difference of microstructure between them, which is of guiding significance for quality control and improvement of coiled tubing production process. INDEX TERMS Bias weld, coiled tubing, impedance, microstructures, multi-frequency eddy current.

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“…The method is based on the pre-established relationship between the ultrasonic velocity and the vermicular graphite ratio of cast iron, and the ultrasonic velocity is used to predict the vermicular graphite ratio quickly. 5) Therefore, the measurement of ultrasonic velocity is very important because it is directly related to the accuracy of detecting vermicular graphite ratio. At present, a lot of researches were focused on the ultrasonic system of detecting vermicular graphite ratio and the relationship model between ultrasonic velocity and vermicular graphite ratio, and some progress had been made.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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The ultrasonic method was used to detect vermicular graphite ratio according to the relationship between them. However, there is little report how the factors affect the vermicular graphite ratio detection and ultrasonic velocity measurement. In this paper, using ECHOMETER1076 ultrasonic tester, stylus surface roughness tester and quantitative metallography, the influences of sample two-plane parallelism, probe incident angle, coupling agent type, surface roughness and matrix on the ultrasonic velocity were further studied by experiments and simulation. The parallelism and probe incident angle were found to have important influence on the ultrasonic velocity, increasing more than 4.58 m/s every 0.1°. Contrarily, the influence of coupling agent, surface roughness less than 5 and pearlite percentage were little, and even neglected. So, the parallelism and probe incident angle must be kept as small as possible and the surface roughness is not more than 5. This provide a basis for accurately measuring the ultrasonic velocity and predicting the vermiculate graphite ratio.

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On the correlation between microstructural evolution and ultrasonic properties: a review

Cited by 81 publications

References 119 publications

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Experimental Study of Microstructures in Bias Weld of Coiled Tubing Steel Strip With Multi-Frequency Eddy Current Testing

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

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