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首页> 外文期刊>IEEE Transactions on Magnetics >Magnetic Barkhausen Noise Measurements to Assess Temper Embrittlement in HY-80 Steels
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Magnetic Barkhausen Noise Measurements to Assess Temper Embrittlement in HY-80 Steels

机译：磁性巴克豪森噪声测量可评估HY-80钢的回火脆性

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Magnetic Barkhausen noise (MBN) can result from abrupt motion of domain walls due to their interaction with pinning sites during magnetization of ferromagnetic steel. However, understanding domain structure interactions with pinning site density is limited. In this article, the effect of density of pinning sites within grains of HY80 steel, on generation of MBN, was investigated. Pinning site density was modified by a heat treatment that produces temper embrittlement. Temper embrittlement refers to the reduction of fracture toughness of alloy steels when heated or slowly cooled through the embrittling temperature range and arises due to migration of impurity elements to grain boundaries. Samples, machined from a casting, were held at a constant temperature (525 degrees C) for different holding times, to generate varying degrees of temper embrittlement. MBN signal response was observed to decrease exponentially as a function of holding time with decay constants (relaxation time) in the range of 160-190 h. A reduction in the MBN signal along each sample's easy axis was attributed to different densities of impurity elements, which act as pinning sites for domain wall movement within grains. Samples were also characterized using a scanning electron microscope (SEM), hardness testing, and impact toughness testing. Hardness was observed to increase with holding time and MBN energy decreased linearly with increasing hardness. Furthermore, a linear relationship between impact energy and MBN energy was observed. This implies that MBN signal analysis can be used as an indirect measure of the change in material properties of the sample.
机译：巴克豪森磁噪声（MBN）可能是由于在铁磁钢的磁化过程中畴壁与钉扎点的相互作用而引起的畴壁的突然运动引起的。但是，了解与钉扎位点密度的域结构相互作用是有限的。本文研究了HY80钢晶粒内钉扎点密度对MBN产生的影响。钉扎部位的密度通过产生回火脆化的热处理而改变。回火脆化是指在脆化温度范围内加热或缓慢冷却时，合金钢的断裂韧性降低，这是由于杂质元素迁移到晶界引起的。将由铸件加工而成的样品在恒定温度（525摄氏度）下保持不同的保持时间，以产生不同程度的回火脆化。观察到MBN信号响应随保持时间的函数呈指数下降，衰减时间（松弛时间）在160-190 h范围内。沿每个样品的易轴的MBN信号的减少归因于杂质元素的不同密度，这些杂质元素充当晶粒内畴壁移动的钉扎位点。还使用扫描电子显微镜（SEM），硬度测试和冲击韧性测试对样品进行了表征。观察到硬度随保持时间增加而增加，MBN能量随硬度增加而线性下降。此外，观察到冲击能量和MBN能量之间的线性关系。这意味着MBN信号分析可以用作样品材料特性变化的间接度量。

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