利用激光快速成形技术制造高温合金不锈钢梯度材料

Functionally Gradient Materials Prepared with Laser Rapid Forming

在自制的激光快速成形(LRF)系统上,利用优化的激光快速成形工艺参量,制备了从100% 316L到100%Rene 88DT成分连续渐变的梯度材料(FGM)。所成形梯度材料的组织致密,成分、组织和硬度在40 mm梯度过渡层内连续渐变。在梯度过渡层内,随着Rene 88DT合金所含比例的逐渐提高,硬度和一次枝晶间距持续增大,硬度值从底部100% 316L的186 Hv连续渐变到顶端100% Rene 88DT的458 Hv。平均一次枝晶间距由底部的12.41μm逐渐增大到顶部的16.99μm。

With the home-made laser rapid forming system and suitable processing parameter, functionally graded materials (FGMs) were prepared whose compositions continuously gradually changed from 100% 316L to 100% Rene 88 DT. The microstructure of prepared materials was full dense and very fine, its composition and hardness were continuously varied in the 40-mm transition layers. In the transition layers, with Rene 88 DT's percentage composition increased, the degree of hardness and primary dendritic space were varied from 186 Hv, 12.41 μm with 100% 316 L at the bottom to 458 Hv, 18.99 μm with 100% Rene 88 DT in the top.