Surface Hardening of Non-ferrous Metals by Spark Discharge
Surface Hardening of Non-ferrous Metals by Spark Discharge
复制标题
有色金属的火花放电表面硬化
作者：
N. Welsh
该实验室的一项早期通信1描述了利用电火花的热作用来模拟摩擦加热对摩擦钢表面结构的影响的实验。在某些情况下，摩擦接触的高局部温度会引发奥氏体相的形成，并且由于传导到块体金属中提供了热点的有效淬火，因此形成了马氏体相并导致表层硬化。同样，电火花在电极和钢铁表面之间产生的短暂但强烈的热量可以使少量材料变硬。如果火花电极穿过表面，就会形成一层坚硬且耐磨的皮肤。
AN earlier communication1from this Laboratory described experiments in which the thermal action of electric sparks was used to simulate the effects of frictional heating on the structure of rubbing steel surfaces. The high local temperatures which characterize rubbing contacts can, in certain circumstances, initiate austenite formation and, since conduction into the bulk metal provides effective quenching of the hot spots, martensite is formed and causes hardening of the surface layer. Similarly the brief but intense heat of an electric spark, struck between an electrode and the steel surface, can harden a small volume of material. If the sparking electrode traverses the surface a hard and wear-resistant skin develops.