论文部分内容阅读
利用MTS双轴试验机制作了具有不同塑性变形及不同疲劳损伤的试样,采用四端子直流电位法考察塑性变形和疲劳损伤对304奥氏体不锈钢材料电导率的影响,并利用极软磁磁滞回线仪测量塑性变形和疲劳损伤对材料磁性特性的影响。结果表明:首先基于实验研究发现塑性变形会导致材料电导率下降,磁特性升高;并通过微观分析得到塑性变形引起材料位错、滑移、孪晶的产生是导致材料电磁属性变化的诱因。其次,考察了疲劳损伤对304奥氏体不锈钢电磁特性的影响,表明疲劳损伤也可使材料电导率下降,磁特性升高。最后,实验研究发现塑性变形与疲劳损伤的复合作用增强了对304奥氏体不锈钢电磁特性的影响。
The samples with different plastic deformation and different fatigue damage were made by MTS biaxial test machine. The influence of plastic deformation and fatigue damage on the electrical conductivity of 304 austenitic stainless steel was investigated by four-terminal DC potentiometry. Effect of Plastic Deformation and Fatigue Damage on Magnetic Properties of Materials Measured by Hysteresis Loop Instrument. The experimental results show that plastic deformation leads to the decrease of electrical conductivity and the increase of magnetic properties. Based on the experimental results, it is found that the plastic deformation causes material dislocation, slippage and twins, which are the inducement of the change of electromagnetic properties. Secondly, the effect of fatigue damage on the electromagnetic properties of 304 austenitic stainless steel was investigated. It shows that the fatigue damage can also decrease the conductivity of the material and increase the magnetic properties. Finally, the experimental study found that the combined effect of plastic deformation and fatigue damage enhanced the electromagnetic properties of 304 austenitic stainless steel.