NDT Technology

NDT Technology

Application of nondestructive magnetic flux leakage method in characterization of mechanical properties of API X65 steel

Document Type : Original Article

Authors
Hossein Norouzi Sahraei 1
Farzad Akhlaghi Modiri 1
Saeed Kahrobaee 2
Iman Ahadi Akhlaghi 3
1 Center of Nondestructive Evaluation, Sadjad University of Technology, Mashhad, Iran.
2 Department of Mechanical and Materials Engineering, Sadjad University of Technology, Mashhad, Iran.
3 Department of Electrical and Bioelectric Engineering, Sadjad University of Technology, Mashhad, Iran.
10.30494/jndt.2021.277217.1062
Abstract
In this paper, the capability of non-destructive method of magnetic flux leakage in characterizing the microstructure and mechanical properties of API X65 steel has been evaluated. Magnetic flux leakage method is a popular non-destructive inspection method for oil and gas pipelines based on the detection of magnetic flux leakage from the surface of the part. This test is widely used to identify all discontinuities including surface and subsurface cracks as well as thickness changes due to latent corrosion in the inner wall of pipelines. In this study, four different microstructures subjected to four different types of heat treatment have been used. The results show that changes in microstructural characteristics, including morphology of the ferrite phase (polyhedral or needle) as well as the size of the ferrite grains, affect the density of magnetic flux lines emitted inside the part and the amount of magnetic flux leaked from the surface. Therefore, one can use the magnetic flux leakage test to efficiently determine the type of microstructure as well as the mechanical properties of the part.
Keywords
Magnetic flux leakage test
Non-destructive testing
API X65 Steel
Mechanical properties
Microstructural changes

Subjects

 
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  • Receive Date 13 March 2021
  • Revise Date 11 May 2021
  • Accept Date 21 May 2021