Abstract The nickel interlayer improved the laser weldability of Zr-2.5Nb to AISI 410 stainless steel. The fusion zone contained a large amount of refined and tough dendritic γ-Ni(Fe, Cr) solid solution (182 ∼ 268 HV), while the brittle Zr(Fe, Cr)2 intermetallic compound (1171 ∼ 1460 HV), which was the main phase as the result of direct welding of Zr-2.5Nb to SS410 as well as the source responsible for the welding cracks, disappeared. Only limited quantities of Zr2(Ni, Fe), Zr7Ni10 (and/or Zr2Ni7) intermetallics were present mainly in the form of thin layers (less than 200 μm thick in total) near the fusion interface with Zr-2.5Nb. Those Zr-Ni based intermetallics showed relatively higher toughness and lower hardness (301 ∼ 497 HV) than the brittle Zr(Fe, Cr)2, which reduced the overall cracking sensitivity of the laser-weld.

中文翻译：

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Zr-2.5Nb 合金与含 Ni 填料的 AISI 410 不锈钢的激光焊接性能

摘要 镍夹层提高了Zr-2.5Nb 与AISI 410 不锈钢的激光焊接性。熔合区含有大量细化且坚韧的枝晶γ-Ni(Fe, Cr)固溶体(182 ∼ 268 HV)，而脆性Zr(Fe, Cr)2 金属间化合物(1171 ∼ 1460 HV) Zr-2.5Nb 与 SS410 直接焊接的主要相以及造成焊接裂纹的源头消失了。只有有限数量的 Zr2(Ni, Fe)、Zr7Ni10（和/或 Zr2Ni7）金属间化合物主要以薄层（总厚度小于 200 μm）的形式存在于与 Zr-2.5Nb 的熔合界面附近。与脆性 Zr(Fe, Cr)2 相比，这些 Zr-Ni 基金属间化合物显示出相对较高的韧性和较低的硬度 (301 ∼ 497 HV)，从而降低了激光焊接的整体开裂敏感性。