进行了K418高温合金和42CrMo钢的激光焊接实验,分别采用OM、SEM、XRD和EDS等手段分析了焊缝的金相组织和物相组成,评价了焊缝的显微硬度和拉伸强度.结果表明:焊缝主要由树枝状非平衡凝固的FeCrNiC (()固溶体组成,此外,还有少量细小、弥散的Ni3Al (( ()相、Laves 颗粒和少量MC碳化物分布在树枝晶间区域.由于主要强化相( (在激光辐照后的部分溶解和随后快速凝固的抑制作用,焊缝的硬度虽分布较均匀但低于母材.由于没有获得穿透的焊接接头,焊接接头的强度约只有母材的88.5%,焊缝的断裂机制是塑性和脆性断裂的混合机制.由于在焊缝中存在一些Laves 颗粒,这促进了微裂纹和微孔的形成和扩展,降低了焊接接头的抗拉强度.
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