锡青铜激光选区熔化工艺及其性能

Selective Laser Melting of Tin Bronze Alloy and Its Properties

为了研究QSn6.5-0.1锡青铜激光选区熔化(SLM)技术直接成型工艺及其成型性能,设计三因素四水平正交工艺实验,研究激光功率、扫描速度和扫描间距对致密度的影响,采用SEM、OM、Micro-CT以及显微硬度仪研究微观组织与硬度。结果表明:选择合理的优化工艺参数,锡青铜(SLM)成型致密度最高达到98.71%;微观组织为网络状枝晶结构且分布均匀的(α+δ)相和α相;成型试样显微维氏硬度比传统铸造的软态(700～900 MPa)高45%左右;直接成型的风轮模型致密性高。表明采用激光选区熔化技术可以成型性能较好的QSn6.5-0.1锡青铜合金零件。

In order to investigate the process and performance of QSn6.5-0.1 tin bronze manufactured by selective laser melting（SLM） technique, the orthogonal experiment of three factors and four levels were designed to study the influence of laser power, scanning speed and scanning distance on the density. SEM, OM, Micro-CT and microhardness tester were used to study microstructure and hardness. The results show that the density of Sn-Cu SLM is up to 98.71% with optimized process. The microstructure is net-like dendritic structure with homogeneous（α＋δ） phase and α phase. Micro vickers hardness（HB） is about 45% higher than the traditional casting of the soft state（700~900 MPa）. The wind wheel model manufactured directly has high compactness. It is indicated that the QSn6.5-0.1 tin bronze alloy parts with better performance can be manufactured directly by SLM.