摘 要 利用SEM、XRD和TEM等分析手段研究了固溶处理对热压烧结CoCrW合金相组成的影响；通过硬度测试、室温拉伸和摩擦磨损实验，研究了固溶处理对热压烧结CoCrW合金力学性能的影响。结果表明：热压态与固溶态CoCrW合金的组成相均为M23C6、M6C、CrCo金属间化合物和γ-Co基体；固溶处理降低了合金中的M23C6含量、原始颗粒边界，同时改善了合金塑性和耐磨性能。合金室温硬度、抗拉强度均随固溶温度升高、固溶时间延长而先增高后降低。

ABSTRACT: Nowadays, cobalt-based alloys have been employed in the fields requiring high temperature, corrosion and wear resistance, such as nuclear, aerospace and gas turbine industries. However the cast cobalt-based alloys have relatively high brittleness, and low toughness. So powder metallurgy is used to mold CoCrW alloys. Although their toughness is improved, powder metallurgy CoCrW alloys are still too fragile in some situation. In order to improve the mechanical properties of powder metallurgy CoCrW alloys, solid solution treatment was taken in this work. CoCrW alloys prepared by hot pressing process were solid soluted and the influences on microstructure of the alloys were investigated using SEM, XRD and TEM. Mechanical properties changes of the solutioned CoCrW alloys were studied by hardness test, room-temperature uniaxial tensile and ball-on-disc reciprocating wear test. The results indicate that both the as-hot pressed and solutioned CoCrW alloys consist of the same phases: M23C6, M12C, CrCo intermetallic andγ-Co matrix. The content of M23C6 and prior particle boundaries decrease remarkably after solution treatment, and the ductility and wear resistance of CoCrW alloys are improved. Both the hardness and the tensile strength at room temperature of CoCrW alloys increase first and then decrease with increasing solution temperature and time.