长石对明弧堆焊合金的组织及耐磨性影响

Effects of feldspar on microstructure and abrasion resistance of open arc surfacing alloys

采用侧向添加活性剂的方法研究了长石含量对复合粉粒和实心焊丝明弧堆焊合金的组织及耐磨性影响。借助高速摄像仪分析电弧形态;通过X射线衍射仪、扫描电镜及其附属电子能谱仪和磨损试验机研究堆焊合金的组织及耐磨性。结果表明:添加含长石活性层的挡块后,电弧扩张,形态由钟罩形改变为半球形,这使电弧覆盖面积增加,堆焊合金的粉粒填充量提高,初生M_(7)C_(3)相先从细条状转变为板条状,耐磨性显著增加,但长石过量后,电弧往外扩展过多,对实心焊丝的预热增强而提高其熔化量,粉粒填充量轻微下降,初生M_(7)C_(3)相减小,耐磨性下降。

The effect of feldspar content on microstructure and wear resistance of composite powder and solid wire open-arc surfacing alloy was studied by adding active agent on the side.The arc shape was analyzed by high speed camera.The microstructure and wear resistance of surfacing alloy were studied by X-ray diffractometer,scanning electron microscope and its accessory electron spectrometer and wear testing machine.The results show that after the stopper containing feldspar active layer,the arc expands and its shape changes from bell shape to hemispherical shape,which increases the arc coverage area,increases the powder filling amount of the surfacing alloy,and the primary M_(7)C_(3) phase first changes from thin strip to sheet strip,which significantly increases the wear resistance.However,after excessive feldspar,the arc expands too much,and the melting amount of the solid welding wire is enhanced by the preheating of the solid welding wire.The particle filling decreases slightly,the primary M_(7)C_(3) phase decreases,and the wear resistance decreases.