CMT-Pin增材制备GH4169高温合金柱形阵列成形工艺和组织特征

CMT-Pin Additive Preparation of GH4169 High Temperature Alloy Columnar Array Forming Process and Microstructure

采用Φ1.2 mm的ER-GH4169焊丝,通过CMT-Pin增材技术在5 mm厚Q235碳钢基板上制备柱形阵列结构,研究了Pin针成形工艺和组织特征。结果表明:当Ball/Cyl Adaptation参数为负时,Pin针头型为平头;当Ball/Cyl Adaptation为非负时,Pin针头型为球头;Altitude Adaptation控制Pin针生长的高度,获得Pin针高度在2.30-4.96mm之间。Pin针的微观组织分为Pin轴区、熔合区、母材区。Pin轴区分布着大量的柱状晶,沿轴向外生长;在熔合区,沿Pin轴往上柱状晶由细晶转变为粗晶,熔合区为一条极细的熔合线,晶间析出大量条状的Laves相;在母材区,存在组织明暗交接分层。

UsingΦ1.2 mm ER-GH4169 welding wire,the columnar array structure was prepared on Q235 carbon steel substrate with 5 mm in thickness by CMT-Pin additive technique,and the Pin forming process and tissue characteristics were investigated.Results show that when the Ball/Cyl adaptation parameter is negative,the Pin head shape is cylindrical;when the Ball/Cyl adaptation is non-negative,the Pin head shape is ball.The altitude adaptation controls the height of Pin growth,and the Pin height is 2.30-4.96 mm.The microstructure of Pins is divided into Pin axis zone,fusion zone,and base material zone.Pin axis area has a large number of columnar crystals,which grow outward along the axis.In the fusion area,the columnar crystals change from fine crystals to coarse crystals along the upward Pin axis,and the fusion area is a very fine fusion line with a large number of strips of Laves phase precipitated between the crystals.The tissues of light and dark interlayers exist in the base material area.