CuAlBe高强度阻尼合金与不锈钢扩散焊接头组织

Study on Joint Structure of CuAlBe High Strength Damping Alloy with Stainless Steel in Diffusion Bonding

以Ni箔作中间层对新型舰船推行器用阻尼材料CuAlBe合金与 1Cr18Ni9Ti不锈钢固相扩散焊接头的微观组织及断口形貌进行了扫描电镜、电子探针线扫描、X射线衍射及微区能谱等微观分析。结果表明 ,焊接热循环易使CuAlBe合金近界面生成粗大的 β相 ,α相沿晶界网状分布 ,这将引起热弹性马氏体阻尼功能退化 ;同时 ,CuAlBe合金与 1Cr18Ni9Ti不锈钢两者塑性变形能力的差异及Cu -Ni界面Kirkendall效应在较大程度上影响扩散焊初期的原子相互扩散 ,进而影响稳定扩散阶段的冶金结合性 ;此外 ,焊接过程元素间的相互扩散在一定程度上影响着接头的断裂特征。

The microstructure of solid diffusion welded joint between a new type damping CuAlBe alloy to be used for naval ship propelling screw manufacturing and 1Cr18Ni9Ti stainless steel with Ni foil interlayer was analyzed by means of SEM,EPMA line scan,X ray diffraction and micro area EDS techniques.The result showed that the microstructure of CuAlBe alloy nearby interface was coarse β phase following a network α phase distributing in grain boundary through thermal cycle.This would cause degeneration of damping function produced by thermal elastic martensite.At the same time,the difference of plastic deforming ability between CuAlBe and 1Cr18Ni9Ti and the Kirkendall effect on Cu Ni interface would affect atom diffusion at the initial period of diffusion bonding.Moreover,this would influence metallurgy weldability at steady diffusing stage.Otherwise,the diffusion of atoms in welding process exerted some influence on fracture character of material in certain degree.