沉积路径对等离子弧快速成形Inconel625合金组织及性能的影响

Effect of deposition path on microstructure and mechanical properties of plasma arc rapid prototyping of Inconel 625 alloy

关键词:  等离子弧快速成形  沉积路径  沉积态组织  力学性能

Key words:  plasma arc rapid prototyping  deposition path  as-deposited microstructure  mechanical properties

摘要:

研究了沉积路径对等离子弧快速成形Inconel625合金组织及性能的影响，分析了不同沉积路径条件下沉积态组织的生长机制.结果表明，沉积路径对组织特征的影响机理主要表现为不同的热输入和散热方向，导致了不同温度梯度，从而影响组织生长的延续性，正反交替路径获得最佳的成形质量和力学性能，交叉路径虽然导致了组织的交替生长，促进了层内区域细小的枝晶的生成和Laves相的弥散析出，但在层与层边界处，严重的元素偏析，大量脆性相的析出以及枝晶的粗化使力学性能没有大幅度提高.

Abstract:

In order to optimize the microstructure and mechanical properties of plasma arc rapid prototyped Inconel625 alloy, the alternating and cross paths were applied to forming the rectangular block sample. The effects of the two paths on the structure and properties of block samples were investigated, and the growth mechanisms of the as-deposited structures under the two conditions were analyzed. The results show that different heat input and heat dissipation directions result in different temperature gradient, and have an influence on the continuity of structure growth. The optimal forming quality and mechanical properties were obtained under the condition of alternating path. Although using the cross path can lead to the alternating structure growth, the formation of small dendrite and the disperse precipitation of Laves phase, the mechanical properties were not increased drastically because of serious element segregation, precipitation of brittleness phase and the coarsening of dendrite.