摘要
采用金相组织分析、X射线衍射物相分析、力学性能测试、扫描电镜和能谱分析研究了半连续铸造、离心铸造和真空吸铸3种铸造方式下QAl10-4-4铝青铜的组织与性能。结果表明,在3种铸造方式下合金均含有α相、γ2相和K相,但是真空吸铸的组织中还含有少量的亚稳β′相;真空吸铸的组织最致密、细小,其中的K相均匀弥散分布在基体上,组织中各相的硬度以及合金的抗拉强度和硬度均最高;半连续铸造和离心铸造的内外组织不均匀,部分K相发生团聚,其中离心铸造组织的硬度从边部至中部呈现周期性的起伏,且越靠近铸锭边部,其峰值硬度越大。
Effects of different special casting methods, such as semi-continuous casting, centrifugal casting and vacuum suction, on microstructure and properties of QA110-4-4 aluminum bronze were investigated by OM (optical microscope), XRD (X-ray diffraction), tensile testing, SEM (scanning electron microscope) and EDS (energy dispersive spectrometer). The results show that α phase, γ2 phase and K phase can be observed in the alloys prepared by three kinds of casting methods. In addition, a little metastable β′ phase can be observed in microstructure of vacuum suction alloy. Microstructure of vacuum suction alloy exhibits the finest and the most compactness, in which K phase is homogeneously distributed. Meanwhile, the highest microhardness and tensile strength as well as hardness can be obtained. Inner-outer microstructure of semi-continuous casting and centrifugal casting specimens become heterogeneous, in which K phase is partly agglomerated. Micro-hardness of centrifugal casting specimen exhibits periodically fluctuated from the edge to the heart. The peak hardness is increased nearby the edge.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第12期1171-1174,共4页
Special Casting & Nonferrous Alloys
基金
科技部中小企业创新基金资助项目(08C26213600936)
关键词
特种铸造
铝青铜
组织
性能
Special Casting, Aluminum Bronze, Microstructure, Properties
