Investigating the effects of quenching and tempering on steel microstructures by Magnetic Barkhausen Noise method

Non-destructive evaluation of the properties of the heat treated steels is a challenging task. In this study, quenched and quenched-tempered (200°C and 600°C) SAE 1040 and SAE 4140 steels were characterized by Magnetic Barkhausen Noise (MBN) method. First, the microstructures of the samples were characterized by SEM examination and hardness measurements. Then, the MBN signals were evaluated by using a commercial Barkhausen noise system. The results showed that the MBN response of the as-quenched martensite is very low. However, as tempering temperature increases, in contrast to the reduction in hardness, the MBN response of the microstructure increases due to the enhancement of domain wall displacement with softening of the martensite. MBN method seems to be a promising tool for evaluating microstructure of quenched and tempered steels after establishing the quantitative relationships between MBN parameters and the microstructure. Copyright © 2012 ASM International® All rights reserved.
6th International Quenching and Control of Distortion Conference: Quenching Control and Distortion, Including the 4th International Distortion Engineering Conference


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This paper presents non-destructive evaluation of microstructures of heat treated steels by the Magnetic Barkhausen Noise (MBN) method. Various steel specimens having different microstructures were produced by appropriate heat treatments. All specimens were characterized by metallographic examinations, hardness and MBN measurements. The results showed that MBN parameters are highly sensitive to the variations in the microstructure, and this method is a promising candidate for practical non-destructive chara...
Characterization of steel microstructures by magnetic barkhausen noise technique
Gür, Cemil Hakan (2012-12-01)
Optimization and control of the microstructure is vital for improving performance and service life of the steel components. Development of non-destructive techniques for microstructure characterization has been a challenging task for many years. Magnetic Barkhausen Noise method is a non-destructive evaluation technique with high potential for characterization of steels. This paper summarizes the related studies performed at METU.
Citation Formats
C. H. Gür and İ. Çam, “Investigating the effects of quenching and tempering on steel microstructures by Magnetic Barkhausen Noise method,” Chicago, USA, 2012, Accessed: 00, 2021. [Online]. Available: