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

摘要:

本文采用?1.2mm的ER-GH4169焊丝,通过CMT-Pin增材技术在5mm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(2.30~4.96)mm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。

Abstract:

In this paper,we used ?1.2mm ER-GH4169 welding wire to prepare columnar array structure on 5mm thick Q235 carbon steel substrate by CMT-Pin additive technique,and investigated the Pin forming process and tissue characteristics.The 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;Altitude Adaptation controls the height of Pin growth,and the Pin height is obtained between (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 Pin axis upward,and the fusion area is a very fine fusion line,with a large number of strips of Laves phase precipitated between the crystals;in the base material area,there is a tissue of light and dark interlayer.