白玉超,杨永强,王迪,肖然,刘洋.锡青铜激光选区熔化工艺及其性能研究[J].稀有金属材料与工程,2018,47(3):1007~1012.[BAI Yu-chao,YANG Yong-qiang,WANG Di,XIAO Ran,Liuyang.Research on the Process and Properties of Tin Bronze Alloy Manufactured by Laser Selective Melting[J].Rare Metal Materials and Engineering,2018,47(3):1007~1012.]
锡青铜激光选区熔化工艺及其性能研究
投稿时间:2016-02-26  修订日期:2016-12-06
中文关键词:  激光选区熔化  铜合金  工艺参数  微观组织  显微维氏硬度
基金项目:国家自然科学基金资助项目(51275179)
中文摘要:
      研究激光选区熔化(SLM)技术直接成型QSn6.5-0.1锡青铜合金,探讨激光功率、扫描速度和扫描间距对锡青铜致密度的影响。在块体成型探究实验的基础上设计三因素四水平正交工艺实验,研究成型件的致密度、微观组织与显微维氏硬度,结果表明:增大激光功率和选择合适的扫描速度与扫描间距有利于提高锡青铜成型致密度,在优化的工艺参数下成型致密度最高达到98.71%;微观组织具有明显的网络状枝晶结构且分布均匀,主要为含锡高的(α+δ)相和含铜高的α相;成型试样的顶面和侧面显微维氏硬度均值分别为133.87HV和130.69HV,比QSn6.5-0.1锡青铜合金传统铸造的软态(70~90HB)高45%左右。采用优化工艺参数成型出锡青铜三维风轮模型,应用计算机断层扫描技术(MicroCT)研究风轮模型内部成型效果,并对其上表面显微维氏硬度进行测试,发现内部致密性好,显微维氏硬度较高。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。
Research on the Process and Properties of Tin Bronze Alloy Manufactured by Laser Selective Melting
英文关键词:selective laser melting  tin bronze alloy  process parameters  microstructure  micro vickers hardness
英文摘要:
      In this paper, we choose QSn6.5-0.1 tin-bronze alloy that directly manufactured by SLM as material to study the influence of laser power,scan speed and scan space on the relative density of the tin-bronze alloy. An orthogonal process experiment with three factors and four levels on the basis of block forming experiment was designed to study the microstructure and the micro Vickers hardness of the forming parts. The results showed that high relative density of tin-bronze alloy could be got by increasing the laser power and choosing the appropriate scan speed and scan space. And with the optimized process parameters, the relative density of the samples is up to 98.71%. The microstructure is built up of obviously reticular dendrite structure with uniform distribution, mainly containing(α+δ)phase with rich tin and α phase with rich copper. The average micro vickers hardness of the top surface and the side face of the sample are respectively 133.87HV and 130.69HV, which are 45% higher than that of the traditional casting soft state of QSn6.5-0.1 tin-bronze alloy(70HB-90HB). so it had excellent mechanical properties. A three-dimensional wind-round model of tin bronze alloy was manufactured with optimized process parameter. Internal forming quality of wind-round model was researched by computer tomography (MicroCT) technology. And the Vickers hardness of top surface was also tested. The results showed that the internal relative density was high as well as the Vickers hardness of top surface. It is believed that QSn6.5-0.1 bronze alloy parts with fine quality can be manufactured by SLM technology.
作者单位E-mail
白玉超 华南理工大学机械与汽车工程学院 1101085661@qq.com 
杨永强 华南理工大学机械与汽车工程学院 meyqyang@scut.edu.cn 
王迪 华南理工大学机械与汽车工程学院  
肖然 华南理工大学机械与汽车工程学院  
刘洋 华南理工大学大学机械与汽车工程学院  
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