应力和组分占比对马氏体-铁素体双相钢中磁巴克豪森噪声的影响

磁巴克豪森噪声(MBN)技术在马氏体-铁素体双相钢的微观结构及应力无损评价与表征中具有巨大潜力.为探究拉应力和铁素体占比对磁巴克豪森噪声的影响规律及权重,在0?200MPa范围内实验测得了具有不同铁素体占比的双相钢MBN信号.重点分析了MBN蝶形曲线双峰峰值(分别代表马氏体和铁素体)在应力和铁素体占比两因素耦合条件下的...

Effect of applied stress and phase proportion on the magnetic Barkhausen noise in martensite-ferrite steel

Magnetic Barkhausen noise(MBN)technique has great potential in non-destructive evaluation of microstructure and stress in martensite-ferrite steel.To investigate the influence and weight of applied tensile stress and ferrite proportion on MBN,experiments are performed in dual-phase steel with different ferrite proportion under tension in the range of 0~200MPa.The change trends of double peaks(representing martensite and ferrite respectively)of MBN butterfly curve under the coupling condition of stress and ferrite proportion are specially analyzed.The results show that the MBN peak corresponding to ferrite hardly changes obviously with the increase of stress and ferrite proportion due to the complex competition mechanism.The MBN peak corresponding to martensite increases rapidly at first and then increases slowly as the ferrite proportion increases.In addition,the growth rate of the second stage is faster in the high stress range.Stress and ferrite proportion will lead to the increase of MBN peak value.In general,the phase proportion is the dominant influence factor when the ferrite proportion is less than 12%,and the influence weight of stress and ferrite proportion is in the same order when the ferrite proportion exceeds 12%.