(中国科学院 金属研究所，沈阳110016)
摘 要: 研究几种微量元素对高温合金力学性能和微观组织结构的影响；从晶界结合力、晶界沉淀和凝固偏析等方面对微量元素的不同作用进行讨论。结果表明：适量的B、C、Y、La、Ce、Zr和Mg明显改善高温合金的持久性能；Si和S则明显降低高温合金的持久性能；而P对一些高温合金特别是变形高温合金表现出有益作用，而对另一些高温合金特别是铸造合金表现出有害作用。
关键字: 高温合金；微量元素；作用机理；力学性能；微观组织
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The effects of several minor elements on the microstructure and mechanical properties of superalloys were studied. The roles of minor elements in grain boundary cohesion, grain boundary precipitation and solidification segregation were discussed. The results show that a proper quantity of B, C, Y, La, Ce, Zr or Mg can significantly improve the stress-rupture property of superalloys, whereas Si and S degrade it remarkably; in addition, P is beneficial to some wrought superalloys, while it is harmful to some cast superalloys.
Key words: superalloys; minor element; mechanism; mechanical property; microstructure
