【摘要】 Co-Cr-W-Ni合金中碳化物的类型和析出机制对合金的力学性能影响显著,本实验采用XRD、SEM-EBSD和TEM技术研究了Co-Cr-W-Ni合金时效后碳化物的析出类型、分布特征和析出机制。结果表明,Co-Cr-W-Ni合金中碳化物的主要类型为M₇C₃、M₆C和M₂₃C₆;M₂₃C₆型碳化物主要分布于孪晶与γ相晶粒的三叉交界处,与基体γ相是立方-立方的取向关系;M₇C₃型碳化物退化分解并原位析出M₆C型碳化物,是Co-Cr-W-Ni合金中一种重要的碳化物析出机制。更多还原

【Abstract】 The type and precipitation mechanism of carbide in Co-Cr-W-Ni alloy have significant influence on the mechanical properties of alloy. Therefore, the precipitation type, distribution characteristics and precipitation mechanism of carbides after aging of Co-Cr-W-Ni alloy were studied in this work. The aged samples were characterized by XRD, scanning electron microscopy and transmission electron microscopy. The results show that the main carbides are M₇C₃, M₆C and M₂₃C₆. M₂₃C₆ carbide preferentially precipitates at grain boundaries and twin boundaries, and its relationship with matrix is of cube-cube orientation. The M₇C₃ carbide decomposing gradually with the M₆C carbide precipitating in situ is an important precipitation mechanism of carbide in the Co-Cr-W-Ni alloy.更多还原