气缸套工作面等耐磨处理的试验研究

采用数控等离子束专用机床与自制的电流调控装置对气缸套工作面进行等耐磨硬化处理试验研究.试验发现在工作电流为60～90 A时,随着扫描行程与电流的增大,硬化层的深度、宽度以及硬度均呈直线上升,奥氏体化程度更为充分,马氏体含量逐渐增加,残余奥氏体含量逐渐减少.研究结果表明:气缸套内表面经等离子束扫描后,实现自淬火,获得了高...

Experimental Research on Same Wear-resisting Processing of Cylinder Liner Working Surface

With the CNC plasma special machine and self-developed current regulation device,the same wear-resisting processing of cylinder liner working surface was carried out.It was found that the depth,width and hardness of hardened layer showed a linear increase with the increase of scanning area and current when the current was between 60 A and 90 A.In addition,the austenitizing was more thorough,the content of martensite gradually increased and the content of residual austenite gradually decreased.The results show that the inner surface of cylinder liner can have the high-hardness hidden needle martensite structure through the self-quenching after plasma beam scanning.The wear difference between top and bottom of original cylinder liner is large and the wear is also more severe.The wears in each position of double-layer grid plasma beam hardened cylinder liner are almost the same,which is equal to only 1/3 of the original wear.