改进DD3单晶高温合金热处理工艺的研究  

Study on Modified Heat Treatment for DD3 Single Crystal Superalloys

作　　者：韩梅[1] 骆宇时[1] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

出　　处：《航空材料学报》2009年第2期34-38,共5页Journal of Aeronautical Materials

摘　　要：对DD3合金进行差热分析和物理化学相分析，并依据该结果确定了改进的热处理工艺。研究了该热处理工艺对DD3合金的组织及性能的影响。试验结果表明，改进的热处理工艺改善了组织均匀性，增大了γ’平均尺寸，改善了γ’尺寸分布范围，同时提高了γ’含量，特别是大尺寸γ’相含量，从而显著提高了DD3合金760～1038℃的蠕变性能。To fully evaluate the feasibility of improving the heat treatment for DD3 single crystal, the effects of a modified heat treat- merit on microstructure and properties were investigated. Experimental observation was gained through metallography, differential ther- mal analysis, physicochemical phase analysis and creep testing. Experimental results show that the modified heat treatment increases the γ＇ size and improves the range of γ＇ size distribution, also increases the γ＇ mass fractions, especially the mass fractions of larger γ＇, which contribute to improvement of creep properties at 760 -1038℃.

关 键 词：单晶高温合金 DD3 热处理 γ’相 

分 类 号：TG146.15[一般工业技术—材料科学与工程]