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通过制备5组异种钢扩散偶(T8和1Cr18Ni9Ti),采用传统的箱式空气实验电阻炉辐射加热和新兴的脉冲电流加热2种方法在同种奥氏体化温度相同加热时间下对比研究了Cr和Ni 2种元素的扩散规律.电子探针的扫描图像显示脉冲电流加热条件下的扩散区较辐射加热条件下的明显增大,且加热温度越高扩散区越大,元素的线扫描测量结果及随后在此基础之上分析计算得出的扩散系数和扩散激活能表明,脉冲电流增强了扩散系数,降低了扩散激活能,从而显著促进了以上2种元素的扩散行为.其主要原因在于脉冲电流伴生的磁场作用降低了Cr和Ni元素的空位形成能和迁移能所致,无疑,该脉冲电流加热技术将为高效低能耗热处理的应用开辟一种潜在的新途径.
Five kinds of dissimilar steel diffusion couple (T8 and 1Cr18Ni9Ti) were prepared by the conventional heating method of box-type air resistance furnace and the new pulse current heating method under the same austenitizing temperature for the same heating time. And Ni2 elements.The scanning electron microscopy images show that the diffusion zone under pulsed current heating significantly increases compared with that under radiation heating, and the higher the heating temperature, the larger the diffusion zone, and the elemental line scan measurement results And then on this basis, the calculated diffusion coefficient and diffusion activation energy show that the impulse current enhances the diffusion coefficient and reduces the diffusion activation energy, thus significantly accelerating the diffusion of the above two elements.The main reason is that the impulse The current-accompanying magnetic field reduces the vacancy formation energy and the migration energy of Cr and Ni elements. This pulse current heating technique undoubtedly opens up a potential new avenue for the application of efficient and low-energy heat treatment.