This work investigates the variation in material properties of steel upon friction stir processing through its magnetic response. The steel plate of grade IS 2062 having a thickness of 3 mm have been friction stir processed (FSPed) using a tool of tungsten carbide with a 15 mm shoulder diameter along with 3 mm pin diameter with traverse of 150 mm/minute and a 800 RPM revolving speed. Magnetic response of these processed plate and base metal has been recorded using Barkhausen noise (BN) analyzer in terms of BN signal parameters i.e. the rms value and pulse count or number of pulses. Barkhausen noise analysis results have been validated with micro-hardness testing and metallographic study of as received metal and the processed samples. Higher microhardness has been found in processed sample in comparison to the as received metal due to grain refinement owing to the combined effect of plastic flow of material during stirring action of the rotating tool and the frictional heat. Barkhausen noise analysis has been performed in a wide range of magnetic field intensity (MFI) and excitation frequencies to study their effect on variation in rms value and the number of pulses.

中文翻译：

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搅拌摩擦处理钢板的巴克豪森噪声分析

这项工作研究了搅拌过程中钢的材料特性通过其磁响应的变化。厚度为3毫米的IS 2062等级钢板已通过使用碳化钨的工具进行了摩擦搅拌处理（FSPed），该工具的肩直径为15毫米，销直径为3毫米，移动速度为150毫米/分钟，转速为800 RPM旋转速度。已经使用Barkhausen噪声（BN）分析仪根据BN信号参数（即有效值和脉冲计数或脉冲数）记录了这些加工过的板材和贱金属的磁响应。Barkhausen噪声分析结果已经通过微硬度测试和金相研究验证了所接收的金属和加工后的样品。由于在旋转工具的搅拌作用和摩擦热期间材料的塑性流动的综合作用，由于晶粒细化，在加工样品中发现的显微硬度高于原样。Barkhausen噪声分析已经在广泛的磁场强度（MFI）和激励频率范围内进行，以研究它们对均方根值和脉冲数变化的影响。