Relation between hardness and ultrasonic velocity on pipeline steel welded joints

Carreόn, Héctor; Barrera, G.; Natividad, C.; Salazar, Μ.; Contreras, A.

doi:10.1080/10589759.2015.1074231

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…In the X-65 steel (Figure 3d), there is a greater quantity of pearlite. The weldments are the main examples of structural components where the final mechanical properties depend on the features of the microstructure obtained after the welding process [7]. On the other hand, the SEM analysis performed on the aged samples revealed the thin dispersed precipitation of particles that were trans-granular, semi-round and fine (100-900 nm).…”

Section: Resultsmentioning

confidence: 99%

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Study of the Precipitation Process in Aging Steel Pipeline Weldments by Thermoelectric Power Means

et al. 2018

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The microstructural changes due to the aging process in steel pipeline weldments as a function of the thermoelectric power (TEP) were studied. In general, the thermoelectric methods are based on the well-known Seebeck effect. The thermoelectric methods monitor the TEP via an electron flux induced by a temperature gradient in metallic materials, which is affected by the different types of defects that are present in the atomic lattice, such as atoms in the solid solution, precipitates and dislocations. In this present study, the relationship among the TEP data, hardness and the microstructure of steel pipeline weldments was investigated. In addition, the coarse and dendritic grain structure of the welding material is extremely and unpredictably anisotropic. Such microstructures are no longer direction-independent to the electron flux. Therefore, it has an opposite negative effect on the TEP and overlaps the precipitation effect due to the aging process. TEP and hardness measurements were obtained in each zone of the weldments. For each section of the weldment, the weld bead (WB), heat affected zone (HAZ) and base metal (BM) were found to correspond to particular values of TEP. The relationship between the TEP and the microstructure of a weldment of X60 and X65 micro-alloyed steel that was artificially aged was obtained using the conventional contact TEP technique (hot-tip) and scanning electron microscopy (SEM). It was found that thermoelectric power is very sensitive to the aging process in the two-studied steel pipeline weldments.

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Section: Resultsmentioning

confidence: 99%

“…The In the X-65 steel (Figure 3d), there is a greater quantity of pearlite. The weldments are the main examples of structural components where the final mechanical properties depend on the features of the microstructure obtained after the welding process [7].…”

Section: Resultsmentioning

confidence: 99%

Study of the Precipitation Process in Aging Steel Pipeline Weldments by Thermoelectric Power Means

et al. 2018

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“…The V(ε) dependence reflects the extremal behavior of the density of mobile dislocations in deformation, while the V(ε) dependence is related to its rate of change on deformation. The relation between the ultrasound rate and the applied stress may be used for nondestructive assessment of the strength of materials -in particular, σu [21][22][23]. Since the localization of the strain and the ultrasound rate vary consistently in the course of plastic f low, it should be possible to assess the mechanical properties on the basis of the ultrasound velocity.…”

Section: Resultsmentioning

confidence: 99%

Effect of X46Cr13 Microstructure on the Ultrasound Rate Propagation under Plastic Deformation

Shlyakhova¹,

Bochkareva

Баранникова

et al. 2021

SSP

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The change in ultrasound rate in the plastic deformation of high-chromium X39Cr13 stainless steel with ferrite–carbide structure (initially), martensite structure (after quenching), and sorbite structure (after high tempering) is investigated. The loading curve is different for each state. In the initial state, the loading curve is practically parabolic. In the martensitic state, linear strain hardening is the only stage. In the sorbitic state, a three-stage curve is observed. The structure of the steel after different types of heat treatment is studied by optical and scanning probe microscopy. In parallel with the recording of the loading curve, the change in properties of the ultrasound surface waves (the Rayleigh waves) in the steel under tension is measured. The structure of the steel determines not only the type of deformation curve in uniaxial extension but also the dependence of the ultrasound rate on the strain.

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“…Ultrasonic immersion testing is a very popular nondestructive method in industries to ensure the product quality and the safety of key components, which can keep good acoustic coupling and is apt to automatic testing [1,2]. But the speckle noise and artifacts are generated easily by the material inhomogeneity and the difference acoustic impedance between water and the specimen, which will reduce imaging accuracy and lead to some difficulties in defect identification [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

Wang

et al. 2018

J. Inst.

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A multi-angle spatial compound imaging method was developed to suppress the speckles and artifacts in ultrasonic immersion testing using a single transducer. The multi-angle echo signals were acquired by an ultrasonic immersion testing system with different incident angles. With consideration of the acoustic difference between water and the specimen, the deviation of the time of flight (TOF) and refraction were corrected. Then the corrected signals were superimposed to reconstruct a multi-angle spatial compound image. The performance of the proposed method is assessed with quantitative accuracy, signal to noise ratio (SNR) and contrast to noise ratio (CNR). Compared with the conventional B-scan imaging, the quantitative accuracy of the longitudinal and lateral sizes of the defect holes in proposed method are respectively improved by an average of 12.3% and 15.8%, and the SNR and CNR are increased by an average of 6.13 dB and 2.65 dB, respectively. The results show the advantage of the proposed multi-angle spatial compound imaging for ultrasonic immersion testing in terms of the less quantitative error and artifacts.

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Relation between hardness and ultrasonic velocity on pipeline steel welded joints

Cited by 12 publications

References 15 publications

Study of the Precipitation Process in Aging Steel Pipeline Weldments by Thermoelectric Power Means

Study of the Precipitation Process in Aging Steel Pipeline Weldments by Thermoelectric Power Means

Effect of X46Cr13 Microstructure on the Ultrasound Rate Propagation under Plastic Deformation

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

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