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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >EFFECT OF DIFFERENT STAGES OF TENSILE DEFORMATION ON MAGNETIC BARKHAUSEN EMISSION IN HIGH STRENGTH LOW ALLOY STEEL
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EFFECT OF DIFFERENT STAGES OF TENSILE DEFORMATION ON MAGNETIC BARKHAUSEN EMISSION IN HIGH STRENGTH LOW ALLOY STEEL

机译：高强度低合金钢中拉伸变形的不同阶段对磁巴哈森发射的影响

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摘要

This study shows that the MBE technique can be used to identify the different stages of deformation such as perfectly elastic, microplastic yielding, the macro-yielding and progressive plastic deformation in ferritic steel base and weldments. Within the elastic region (stage 1), the applied stress can be determined from the change in the MBE level. It is clearly shown in this study that, dislocation generation even during micro-plastic yielding (stage 2) affect the MBE level significantly. The macro-yield phenomenon (stage 3) is reflected by the sharp increase in the MBE level. With progressive plastic deformation (stage 4), the MBE decreases in a linear manner. The difference in the MBE level with and without the applied stress shows the combined effect of the dislocation density and the applied/residual stress. For residual stress determination using the MBE technique, the effect of dislocation density should be taken into account. With prior calibration by X-ray diffraction measurement at different stages of deformation, the MBE can be related to the residual stress generated at different strain level. Since, the MBE measurement system can be made portable, it can be considered as simple, versatile technique and easily applicable in the field for residual stress measurements.
机译：这项研究表明，MBE技术可用于识别变形的不同阶段，例如，铁素体钢基体和焊件的完美弹性，微塑性屈服，宏观屈服和渐进塑性变形。在弹性区域（阶段1）内，可以根据MBE水平的变化确定所施加的应力。这项研究清楚地表明，即使在微塑性屈服过程中（第2阶段），位错的产生也会显着影响MBE水平。 MBE水平的急剧上升反映了宏观收益现象（阶段3）。随着逐渐的塑性变形（阶段4），MBE呈线性下降。在有和没有施加应力的情况下，MBE水平的差异显示了位错密度和所施加/残余应力的综合作用。使用MBE技术确定残余应力时，应考虑位错密度的影响。通过在变形的不同阶段通过X射线衍射测量进行事先校准，MBE可以与在不同应变水平下产生的残余应力有关。由于MBE测量系统可以制成便携式设备，因此可以认为它是一种简单，通用的技术，并且可以轻松地应用于残余应力测量领域。

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