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首页> 外文期刊>Philosophical Magazine Letters >Mitigation of micro-cracks in dissimilar welding of Inconel 718 and austenitic stainless steel
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Mitigation of micro-cracks in dissimilar welding of Inconel 718 and austenitic stainless steel

机译：Inconel 718和奥氏体不锈钢不同焊接微裂纹的减轻

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摘要

Intermetallic formation by solute segregation during dissimilar welding of Inconel 718 and SS316L stainless steel poses a severe challenge of solidification cracking in the welded structure. The minimisation of these intermetallic phases and, eventually, the solidification cracks through variation in welding speed is undertaken in the current study. With a reduction in welding speed, an improvement in the weld dilution level is observed along with a change in microstructural morphology from columnar to equiaxed dendrites. A reduction in solute segregation is evident with higher weld dilution level and equiaxed structure as compared with the columnar dendrites. The enrichment of Nb, Mo, and Ti is witnessed near micro-crack sites produced with a higher welding speed. X-ray diffraction (XRD) analysis confirmed the presence of various intermetallic phases and found to decrease with a reduction in the welding speed. With a reduction in welding speed, the tensile strength improved marginally, whereas a remarkable improvement in tensile ductility (similar to 90%) was found.
机译：Inconel 718和SS316L不锈钢不同焊接期间通过溶质隔离的金属间形成构成焊接结构中凝固裂缝的严重挑战。最小化这些金属间相和最终通过焊接速度变化的凝固裂缝在目前的研究中进行。随着焊接速度的降低，观察到焊接稀释水平的改善以及从柱状到等轴树枝状的微观结构形态的变化。与柱状树突相比，溶质沉淀水平和等轴结构的降低是明显的。在具有较高焊接速度产生的微裂纹部位附近，目睹Nb，Mo和Ti的富集。 X射线衍射（XRD）分析证实了各种金属间相的存在，并发现焊接速度的降低降低。随着焊接速度的降低，抗拉强度略微改善，而发现拉伸延展性（类似于90％）的显着改善。

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