In-situ Characterization by Eddy Current Testing of Graded Microstructural Evolution in the Core and Peripheral Zone during Material Conversion during Case Hardening

2019 ◽  
Vol 74 (6) ◽  
pp. 345-356
Author(s):  
L. V. Fricke ◽  
M. G. Skalecki ◽  
S. Barton ◽  
H. Klümper-Westkamp ◽  
H.-W. Zoch ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Eddy Current ◽  
Peripheral Zone ◽  
Eddy Current Testing ◽  
Case Hardening ◽  
In Situ Characterization ◽  
Current Testing ◽  
The Core

scholarly journals Characterization of Case Hardened AISI 4130 Steel Using Eddy Current Testing

2017 ◽  
Vol 62 (3) ◽  
pp. 1833-1837 ◽  
Author(s):  
R. Gukendran ◽  
R. Parameshwaran ◽  
K. Ponappa
Keyword(s):  
Eddy Current ◽  
Case Depth ◽  
Eddy Current Testing ◽  
Material Object ◽  
Quality Level ◽  
Case Hardening ◽  
Current Testing ◽  
Hardness Property ◽  
Aisi 4130 ◽  
Non Destructive

Abstract Casting is the manufacturing process of pouring the hot liquiduos state metal in to the mold cavity and then allowed it to solidify to obtain the final casting. There are many defects are found in the casting components during the inspection. Some defects are tolerated while others are required to repair. Otherwise the casting component is to be eliminated due to the poor quality level. The aim of the non-destructive inspection is to determine, the flaws, discontinuities on the material, and characteristics of the material. Based on the results by non-destructive evaluation the personnel take the decision on the material object is to be accepted or not as per the criteria. In this paper the hardness attribute of the case hardened AISI 4130 steel samples are studied using Vickers Hardness test. Then the hardness property is correlated with the Eddy Current Testing method. According to the acceptance criterion the suitability of the material is analyzed for the corresponding application or not. In this paper Eddy Current Testing response is analyzed for the AISI 4130 samples to determine the mechanical properties of the material. The main objective of the paper is to investigate the effect of the hardness property of the casting material during various case depth obtained via case hardening process. This technique is effective and best practice for the heat treatment shop floors. By this technique the results are investigated based on the cracks and microstructure of the casting material.

In Situ Eddy-Current Testing on Low-Pressure Turbine Blades of Aircraft Engine

2012 ◽  
Vol 40 (4) ◽  
pp. 103388
Author(s):  
Gong-Jin Qi ◽  
Hong Lei ◽  
Gang-Qiang Fu ◽  
Peng Jing ◽  
Jun-Ming Lin
Keyword(s):  
Eddy Current ◽  
Turbine Blades ◽  
Aircraft Engine ◽  
Low Pressure ◽  
Eddy Current Testing ◽  
Current Testing ◽  
Low Pressure Turbine

Probabilistic evaluation of detection capability of eddy current testing to inspect pitting on a stainless steel clad using multiple signal features

2020 ◽  
Vol 64 (1-4) ◽  
pp. 47-55
Author(s):  
Takuma Tomizawa ◽  
Haicheng Song ◽  
Noritaka Yusa
Keyword(s):  
Stainless Steel ◽  
Eddy Current ◽  
Pressure Vessels ◽  
Eddy Current Testing ◽  
Probability Of Detection ◽  
Current Testing ◽  
Multiple Signal ◽  
Signal Features ◽  
Inner Surface ◽  
Drill Holes

This study proposes a probability of detection (POD) model to quantitatively evaluate the capability of eddy current testing to detect flaws on the inner surface of pressure vessels cladded by stainless steel and in the presence of high noise level. Welded plate samples with drill holes were prepared to simulate corrosion that typically appears on the inner surface of large-scale pressure vessels. The signals generated by the drill holes and the noise caused by the weld were examined using eddy current testing. A hit/miss-based POD model with multiple flaw parameters and multiple signal features was proposed to analyze the measured signals. It is shown that the proposed model is able to more reasonably characterize the detectability of eddy current signals compared to conventional models that consider a single signal feature.

scholarly journals Research on Detection Mechanism of Weld Defects of Carbon Steel Plate Based on Orthogonal Axial Eddy Current Probe

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5515
Author(s):  
Linnan Huang ◽  
Chunhui Liao ◽  
Xiaochun Song ◽  
Tao Chen ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Eddy Current ◽  
Steel Plate ◽  
Difficult Problem ◽  
Eddy Current Testing ◽  
Detection Sensitivity ◽  
Detection Mechanism ◽  
Current Testing ◽  
Weld Defects ◽  
Lift Off

The uneven surface of the weld seam makes eddy current testing more susceptible to the lift-off effect of the probe. Therefore, the defect of carbon steel plate welds has always been a difficult problem in eddy current testing. This study aimed to design a new type of eddy current orthogonal axial probe and establish the finite element simulation model of the probe. The effect of the probe structure, coil turns, and coil size on the detection sensitivity was simulated. Further, a designed orthogonal axial probe was used to conduct a systematic experiment on the weld of carbon steel specimens, and the 0.2 mm width and 1 mm depth of weld defects of carbon steel plates were effectively detected. The experimental results showed that the new orthogonal axial eddy current probe effectively suppressed the unevenness effect of the weld surface on the lift-off effect during the detection process.

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