试件拉伸过程中塑性变形阶段内磁信号无较大数值变化，断裂后信号突变。
The magnetic signals were hardly varied during elastic and plastic deformation periods but changed after fracture rapidly.
试件拉伸过程中塑性变形阶段内磁信号无较大数值变化，断裂后信号突变。
The magnetic signals were hardly varied during elastic and plastic deformation periods but changed after fracture rapidly.
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