李时春,莫彬,王昆明,肖罡,张鹏飞

• 1:湖南科技大学难加工材料高效精密加工湖南省重点实验室
• 2:湖南科技大学机电工程学院
• 3:九江职业技术学院机械工程学院

摘要(Abstract)：

采用激光增材制造制备了多层金刚石/Ni-Cr合金试样，研究了裂纹随堆叠层数增加的变化规律、试样表面与内部的微观组织形态特征、表面与内部的微观裂纹萌生位置及宏观裂纹的形态特征以及裂纹的延伸扩展规律。结果表明：表面裂纹数量随堆叠层数增加先增加后减小。试样表面粗大晶粒组织与细晶粒组织交替排列，后成形熔覆道对已成形熔覆道微观组织具有明显热影响作用。试样内部组织从靠近基板到表面呈现细小→粗大→细小的形态，内部磨粒周边的组织比远离磨粒的组织粗大。表面微观裂纹主要萌生于粗大组织区和磨粒周边，粗大组织和磨粒有利于裂纹的扩张与延伸。在平行于激光扫描方向的熔覆层表面拉应力作用下，表面宏观裂纹主要呈现出垂直熔覆道的形态。内部微观裂纹萌生于磨粒周边、粗大组织区以及碳化物夹杂处。内部宏观裂纹可由内部裂纹向外延伸形成或由表面裂纹向内延伸形成。内部裂纹的桥接、磨粒周围缝隙、破碎的磨粒、碳化物夹杂及粗大组织均会助长内部裂纹的扩张和延伸。

关键词(KeyWords)： 金刚石;镍铬合金;激光增材制造;裂纹

Abstract:

Keywords:

基金项目(Foundation): 湖南省自然科学基金项目(2021JJ30255,2018JJ3183);; 湖南省教育厅科学研究重点项目(20A216)

作者(Author): 李时春,莫彬,王昆明,肖罡,张鹏飞

DOI: 10.13289/j.issn.1009-6264.2022-0093

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