肖笑,尹玉祥,李春凤,李晨星,张柯柯

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心

摘要(Abstract)：

以钨极氩弧焊(TIG焊)为热源,采用■1.0 mm的316L不锈钢焊丝获得了单道多层的直壁构件,通过光学显微镜分析沉积层的微观组织形貌。结果表明,热累积非平衡状态的单层沉积层顶部组织多为骨架状枝晶和等轴晶,底部多为短枝晶;热累积平衡状态的单层沉积层顶部组织多为树枝晶和等轴晶,底部组织以短枝晶为主,存在少量长枝晶。单层沉积层在电弧的反复热作用下,发生微观组织的演变,从而形成最终的构件组织。在热累积非平衡状态的组织演变过程中,热累积增多使得凝固过程中过冷度改变,下层沉积层组织逐渐由骨架状铁素体转变为树枝晶;在热累积平衡状态的组织演变过程则以树枝晶转变为板条铁素体为主。

关键词(KeyWords)： TIG增材;不锈钢;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51705137);; 中国博士后面上项目(2018M070);; 河南省自然科学基金(162300410092)

作者(Author): 肖笑,尹玉祥,李春凤,李晨星,张柯柯

DOI: 10.13289/j.issn.1009-6264.2019-0520

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