摘要
采用反极性弱等离子弧堆焊设备将铝青铜堆焊在铸铁表面,以此提高铸铁的耐磨性和密封性。堆焊后,对堆焊层的硬度、耐磨性、显微组织以及界面的结合情况进行了分析,探究不同堆焊工艺参数下堆焊层组织、性能的变化规律,最终确定最佳堆焊工艺参数。结果表明,当堆焊电流为110 A时,堆焊层的硬度最大,为233.7 HV,当堆焊电流为120 A时,堆焊层磨损量最小,为0.0116 g;堆焊电流的增大可以减少界面氧化物的数量,改善堆焊层界面的结合情况,但是电流过大也会使显微组织变得粗大,降低堆焊层的力学性能。
In order to unprove the wear resistance and tightness, aluminum-bronze alloy was surtaced on cast iron by reverse polarity weak plasma arc.The hardness and mass loss of the surfacing layer was measured. The microstructure and bonding of the surfacing layer were studied by optical metallograghy. The optimal processing parameters would be selected. The results show that the hardness is biggest when the surfacing current is 110A, which is 233.7 HV, the wear extent is smallest when the surfacing current is 120A, which is 0.016g. The number of the oxide decreases and the bonding of the surfacing layer improves when the surfacing current increases. When the surfacing current is bigger, the microstructure becomes thickness, and then the mechanical properties of the surfacing layer decrease.
出处
《热加工工艺》
CSCD
北大核心
2013年第5期195-196,199,共3页
Hot Working Technology
关键词
铝青铜
铸铁
等离子堆焊
工艺参数
aluminum-bronze alloy
cast iron
plasma arc surfacing
processing parameters
