热处理对一种镍基单晶高温合金高温蠕变性能的影响  

Effect of Heat Treatment on the Creeping Strength of Nickel-Base Single Crystal Superalloy at High Temperature

作　　者：李楠[1] 金涛[1] 刘金来[1] 王志辉[1] 赵乃仁[1] 孙晓峰[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2008年第5期789-793,共5页Rare Metal Materials and Engineering

摘　　要：对[001]取向的一种镍基单晶高温合金进行了1050℃,160MPa的拉伸蠕变试验。结合合金性能数据和变形形貌、位错组态的观察,分析了不同热处理制度对合金在高温低应力条件下蠕变性能的影响。结果表明,尺寸为0.4μm左右、规则排列的立方γ′具有较好的高温蠕变性能,而较小的γ′和较大的γ′均不利于合金在高温下的蠕变性能;二次时效处理对提高合金高温蠕变强度的作用不大;筏形组织的完善程度影响合金高温下的蠕变性能;二次γ′相不利于提高合金高温蠕变性能。Tensile creep tests have been carried out at 1050 ℃, 160 MPa to analyze the effect of heat treatment on the creeping behavior of nickel-based single crystal superalloy at high temperatures. The results show that the heat cuboidal and regularly distributed γ′ phase with the size around 0.4 μm can improve the creeping strength at high temperature, and the of γ′ phases in undersize and oversize will reduce the creeping property of alloy. It is concluded that the perfection degree of rafted structure will influence the creeping strength, and the secondary γ′ phase has no effect on the creeping strength in this condition.

关 键 词：镍基单晶高温合金 热处理 蠕变性能 定向粗化 γ′相 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG115[金属学及工艺—合金]