Nondestructive Monitoring of Pearlite Degradation in Medium Carbon Steels by Magnetic Barkhausen Noise Method

Date

2017-09-06

Author

Gür, Cemil Hakan

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Cementite in steel microstructures exits in various forms such as lamellae in pearlite after normalizing, or nano-size particles in ferrite matrix after quenching-tempering, or large spheroidal particles in ferrite matrix after spheroidizing heat treatment. Any alteration in the cementite morphology influences the strength and hardness of pearlite that exists in most of the steel structures used in wide range of industrial applications. For instance, spheroidizing heat treatment is intentionally applied to increase the cold formability and machinability. On the other hand, there is a serious risk for the structural integrity of boiler tubes and steam pipes that operate at elevated temperatures for long periods due to degradation of pearlite by formation of spheroidal cementite. This study aims to investigate the applicability of Magnetic Barkhausen Noise (MBN) method for nondestructive detection of the changes in pearlite caused by prolonged heating of medium carbon steel near the eutectoid temperature. The microstructures were characterized by metallographic investigations, hardness and MBN measurements. It was observed that MBN emission is very sensitive to the alteration in the spheroidization level which makes it a candidate for nondestructive determination of the pearlite degradation.

Subject Keywords

Steel , Pearlite degradation, Nondestructive evaluation, Magnetic Barkhausen Noise

URI

https://hdl.handle.net/11511/73560
https://www.ndt.net/article/ndt-slovenia2017/papers/155.pdf

Conference Name

14th Int Conference of Slovenian Society for Non-Destructive Testing

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

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Citation Formats

C. H. Gür, “Nondestructive Monitoring of Pearlite Degradation in Medium Carbon Steels by Magnetic Barkhausen Noise Method,” Portoroz, Slovenya, 2017, p. 155, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73560.