Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots

Dupont-Marillia, Frederic; Jahazi, Mohammad; Lafreniere, Serge; Bélanger, Pierre

doi:10.1007/s10921-019-0611-8

Cited by 3 publications

(4 citation statements)

References 31 publications

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“…A previous study done on a similar block from the same manufacturing process provided extensive information on the metallurgical parameters and their impact on ultrasound wave propagation (Dupont-Marillia et al, 2019). The metallurgical analysis determined that the phases were mainly bainitic (98-99%) with residual austenite (less than 1%).…”

Section: Methodsmentioning

confidence: 99%

Phased array probe for the inspection of large steel forgings

Dupont-Marillia

Jahazi²,

Bélanger³

2021

Cogent Engineering

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Reliable inspection of large steel forgings is a significant problem across multiple industries. When the dimensions of forgings are at least 1000 mm in each direction, ultrasonic phased array inspection becomes difficult because conventional probes are not designed to transmit and focus acoustic energy over such large distances. Using simulations and experiments, this article aims to discuss the possibilities and limitations of phased array imaging of large forged steel ingots. Simulations were used to design a transducer based on the reflected amplitude, as well as the lateral and axial resolutions of defects in a 1000 mm thick block. It was shown that when limiting the aperture to allow easy handling in an industrial inspection setting, the lateral resolution and the reflected amplitude were the main limitations. Increasing the element width maximizes the energy transmitted into the material, but it also moves elements away from each other, thus reducing the lateral resolution. Based on the simulations, an experimental phased array transducer was manufactured with eight elements of 9.25 × 22.5 mm. The probe was used to perform measurements and generate total focusing method images of three different at a depth of 370 mm in a 776 mm forged steel block.

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Section: Methodsmentioning

confidence: 99%

Phased array probe for the inspection of large steel forgings

Dupont-Marillia

Jahazi²,

Bélanger³

2021

Cogent Engineering

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“…The ultrasound inspection data obtained in the pulsed echo configuration are reconstructed using the synthetic binding application coupling (SAFT) technique. Document [ 13 ] investigated the relationship between changes in ultrasonic group and phase velocity with the local properties of a forged and heat-treated large bainitic steel block. From the obtained data it is possible to find out the number and approximate location of small errors.…”

Section: Introductionmentioning

confidence: 99%

“…Article [ 25 ] describes the problem of the speed of ultrasonic waves as one of the suitable methods for investigating the properties of materials and forgings by non-destructive methods. The paper [ 27 ] focuses on the presented issue of large-scale parts [ 6 , 7 , 13 ]. In the paper [ 29 ], the authors dealt with a wide range of issues of analysis and research of texture issues in metals.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Forging Metal Specimens of Different Relative Reductions Using Ultrasonic Waves

2021

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Forgings produced in industry are an irreplaceable basis for subsequent elaborating on machine tools. The quality of the semi-finished product produced by forging is a necessary prerequisite for ensuring the final quality of the final product because the forging can produce some defects. The presented paper is aimed at investigation of selected characteristics of forging steel specimens for various levels of their relative reduction. Ultrasound testing belongs to methods for investigation of structure changes, including defects. Experimental investigation, using both the attenuation and velocity measurements, verify that the reduction of specimens’ material can have an effect on the propagation of ultrasound waves passing through the specimen body. The procedure of steel samples forging corresponds accordingly to the process of their hardening. The increase of toughness after relative reduction of forging in the range of 10–50% is with highest probability caused by the strength matrices development due to the relatively important deformation hardening. It is evident that the deformation hardening is almost the same after every 10% addition of relative reduction. Experiments are supplemented by Barkhausen noise detection and metallographic characteristics of the samples. While differences between the Barkhausen noise values are in principle relatively small and significant differences are only in the values of the position of the envelope, there is maximum coincidence with ultrasonic investigation.

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“…It must be emphasised that sensitivity of all these methods is limited by the wavelength used and cannot be employed to characterise the microstructural features meaningfully. In this context, ultrasonic velocity [12] and attenuation [13] measurements are considered even on the industrial scale. But ultrasonic wave velocity in a medium is less sensitive to the grain size variations [13-15].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of heterogeneous microstructure in large forged products using nonlinear ultrasonic method

Abraham

Shivaprasad

Das

et al. 2020

Materials Science and Technology

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A comparative study between the ultrasonic attenuation and the nonlinearity is presented for the characterisation of microstructure in large dimension forgings. Results are provided for two austenitic stainless steel forgings of AISI type 304L with a diameter 200 mm, where microscopic observations reveal abnormal grain growth near the surface of one of the forgings. Frequency dependence of the nonlinearity parameter is used to discern variations in grain size in these forgings more precisely than attenuation measurements. The distribution of grain size is shown to have a significant influence on the nonlinearity parameter. Relative changes in the nonlinearity parameter with applied frequency were correlative with the microstructural variations in both the forgings.

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Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots

Cited by 3 publications

References 31 publications

Phased array probe for the inspection of large steel forgings

Phased array probe for the inspection of large steel forgings

Investigation of Forging Metal Specimens of Different Relative Reductions Using Ultrasonic Waves

Characterisation of heterogeneous microstructure in large forged products using nonlinear ultrasonic method

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