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在大气压下,使用高压直流脉冲放电产生微等离子弧,采用此微等离子弧对粗糙和锈蚀的HT250灰铸铁材料表面进行加工处理,对其表面形貌和表面残余应力进行了分析。结果表明,经微等离子弧处理的HT250表面,曲率半径小处全部发生熔化和蒸发去除,去除后的位置平坦化效果明显。表面粗糙度值Ra能从6.73μm降低到1.62μm,且材料表面的锈渍全部被清除,加工后的表面的残余拉应力值也显著减少。因此,采用微等离子弧将有利于提高HT250灰铸铁的使用寿命。
At atmospheric pressure, micro-arc plasma arc was generated by high-voltage direct current (DC) pulse discharge. The surface of rough and rust HT250 gray cast iron was machined using this micro-plasma arc. The surface topography and surface residual stress were analyzed. The results show that the surface of HT250 treated by micro-plasma arc has a small radius of curvature, which melts and evaporates completely. The position flattening effect after the removal is obvious. The surface roughness Ra can be reduced from 6.73μm to 1.62μm, and all the rust stains on the material surface are removed, and the residual tensile stress of the machined surface is also significantly reduced. Therefore, the use of micro-plasma arc will help improve the life of HT250 gray cast iron.