Abstract
Barkhausen noise (BHN) is a technique that can be used to evaluate properties of ferromagnetic materials; case depth, coating depth, residual stress, grinding burnt damage, and hardness of a metallic material. The commercial BHN measuring devices commonly used are relatively expensive. Therefore, the steel industries in Thailand hardly use in their production process. A cost-effective measuring system based on BHN was developed in this research. The developed machine was tested by measuring the hardness of different steels. The hardness measured by the developed BHN system was validated with the hardness measured by the Vickers hardness test. It can be concluded that this proposed measuring machine can estimate the hardness of steels with accuracy of 96.76 percent on average (in hardness rage of 150 – 800 HV). This development can also be applied to measure other properties if the appropriate operating parameters of the machine are changed and calibrated with reliable standards.
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