Abstract Increasing the thickness of the Invar (Ni42Fe50.9C0.6Mn3.5Nb3) interlayer from 1 to 1.5 mm resulted in a continuous metallurgical bonding, free of voids and oxide films. Invar as a pre-placed buffer also led to higher bending strength because of the stress relaxation. When the thickness was increased to 2 mm, the porosity in the fusion zone increased and cracks developed near the fusion boundary on the WC-Co side, lowering the strength. The fusion boundary, heat affected zone and the fusion zone on the WC-Co side were susceptible to cracking. Transmission electron microscopy revealed high densities of dislocations. Energy dispersive spectroscopy suggested that long-range solute diffusion occurred inside the WC grains and at the WC/Fe (Ni)/WC interfaces.

中文翻译：

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层间厚度对光纤激光焊接WC-Co/Invar/316L钢接头组织和强度的影响

摘要 将因瓦合金 (Ni42Fe50.9C0.6Mn3.5Nb3) 夹层的厚度从 1 毫米增加到 1.5 毫米，导致连续的冶金结合，没有空隙和氧化膜。由于应力松弛，殷钢作为预先放置的缓冲器也导致更高的弯曲强度。当厚度增加到 2 mm 时，熔合区的孔隙率增加，WC-Co 侧熔合边界附近出现裂纹，降低强度。WC-Co 侧的熔合边界、热影响区和熔合区容易开裂。透射电子显微镜显示高密度的位错。能量色散谱表明长程溶质扩散发生在 WC 晶粒内部和 WC/Fe (Ni)/WC 界面。