Non-destructive Hardness Measurement of Hot-stamped High Strength Steel Sheets based on Magnetic Barkhausen Noise

Abstract Hot-stamped high strength steel parts are widely used to achieve lightweight of automobile. However, mechanical properties of formed high strength steel parts are difficult to control and predict. In order to realize field nondestructive testing of hot forming high strength steel parts, magnetic Barkhausen noise which is sensitive to microstructure of ferromagnet was used. In the paper, magnetic Barkhausen noise signals of hot-stamped high strength steel strips with different hardness were measured and analyzed. A substantial correlation was found between magnetic Barkhausen noise and hardness (in range 220∼450 HV). Then, frequency domain analysis based on autoregressive modeling was done to find out signal components which are dependent and independent to hardness of the hot-stamped high strength steel. Independent signals can be eliminated based on the frequency analysis. Accordingly, the measurement accuracy can be improved for application in industrial field.

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