Industrial Applications: Ultrasonic Inspection of Large Forgings

Senni, Luca; Battaglini, Luigi; Burrascano, Pietro; Laureti, Stefano; Ricci, Marco

doi:10.1007/978-3-319-10566-6_9

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…However, the use of a narrow-band ultrasonic transducer reduces the range resolution, thus decreasing the defect detection capability. PuC, using a coded waveform, can be used both to improve the SNR and to achieve a higher range resolution [60,61], as demonstrated in the inspection of forgings [62], food [63], composites [12,42,64], concrete [60,65] and phononic crystals [66].…”

Section: Pulse-compressionmentioning

confidence: 99%

Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Laureti

Rizwan

Malekmohammadi

et al. 2019

Sensors

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Ablative materials are used extensively in the aerospace industry for protection against high thermal stresses and temperatures, an example being glass/silicone composites. The extreme conditions faced and the cost-risk related to the production/operating stage of such high-tech materials indicate the importance of detecting any anomaly or defect arising from the manufacturing process. In this paper, two different non-destructive testing techniques, namely active thermography and ultrasonic testing, have been used to detect a delamination in a glass/silicone composite. It is shown that a frequency modulated chirp signal and pulse-compression can successfully be used in active thermography for detecting such a delamination. Moreover, the same type of input signal and post-processing can be used to generate an image using air-coupled ultrasound, and an interesting comparison between the two can be made to further characterise the defect.

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Section: Pulse-compressionmentioning

confidence: 99%

Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Laureti

Rizwan

Malekmohammadi

et al. 2019

Sensors

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“…The issue is quite extensive and the number of papers devoted to the study of the material characteristics of forgings is large. The most important is [ 5 ]. The authors deal with ultrasound control used in non-destructive testing to detect cracks and other defects.…”

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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“…Among several complementary NDE methods, ultrasonic methods are commonly employed in manufacturing and process industries owing to its applicability on any material and competence of real-time analysis. Major drawback associated with the conventional pulse-echo inspection of large size forgings is the weak signal-to-noise ratio which can be dealt with the pulse-compression techniques [7,8] and synthetic aperture focusing technique [9] and also using advanced imaging techniques such as time of flight diffraction [10] and phased array [11]. 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.…”

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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Industrial Applications: Ultrasonic Inspection of Large Forgings

Cited by 4 publications

References 15 publications

Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

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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