(中國(guó)科學(xué)院 金屬研究所，沈陽110016)
摘 要: 研究幾種微量元素對(duì)高溫合金力學(xué)性能和微觀組織結(jié)構(gòu)的影響；從晶界結(jié)合力、晶界沉淀和凝固偏析等方面對(duì)微量元素的不同作用進(jìn)行討論。結(jié)果表明：適量的B、C、Y、La、Ce、Zr和Mg明顯改善高溫合金的持久性能；Si和S則明顯降低高溫合金的持久性能；而P對(duì)一些高溫合金特別是變形高溫合金表現(xiàn)出有益作用，而對(duì)另一些高溫合金特別是鑄造合金表現(xiàn)出有害作用。
關(guān)鍵字: 高溫合金；微量元素；作用機(jī)理；力學(xué)性能；微觀組織
（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
