摘要
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,获得了高硬度的隐针马氏体组织;原硼铸铁气缸套上下部磨损量相差较大,磨损量也大,而双层网格等离子束硬化的硼铸铁气缸套各部位的磨损量几乎相等,其磨损量是原硼铸铁气缸套磨损量的1/3。
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.
出处
《车用发动机》
北大核心
2011年第4期89-92,共4页
Vehicle Engine
基金
河南省科技厅科技攻关项目(210460019)
关键词
气缸套
硼铸铁
等离子束
硬化
耐磨试验
cylinder liner
boron cast iron
plasma beam
hardening
wear-resisting test
