重庆大学学报2017，Vol.40Issue(10)：87-98,12.DOI:10.11835/j.issn.1000-582X.2017.10.010
固溶热处理对一种第三代镍基单晶高温合金组织及高温持久性能的影响
Effect of solution heat treatment on microstructures and stress rupture properties of a third generation Ni-based single crystal superalloy
方向 1赵云松 2张剑 1杨振宇 1姜华 1杨岩 1陈昊 3吴庆辉 4骆宇时1
作者信息
- 1. 北京航空材料研究院,先进高温结构材料重点实验室,北京100095
- 2. 中国航发湖南动力机械研究所,湖南株洲412000
- 3. 陆航驻北京地区军事代表室,北京100022
- 4. 空军驻北京地区军事代表室,北京100061
- 折叠
摘要
Abstract
Effect of solution heat treatment on microstructures and stress rupture properties of a third generation Ni-based single crystal superalloy with content of 6.5％ (mass fraction) Re has been investigated.The experimental results show that the as-cast alloy exists significant solidification segregation and a large percentage of (γ+γ') eutectic.During the solution heat treatment,the (γ+γ')eutectic initially solves rapidly when the temperature is higher than 1 335 ℃.However,the solidification segregation especially the segregation of Re is not significantly reduced until solution heat treatment temperatures exceed 1 360 ℃.The micropore content after solution heat treatment at 1 365 ℃ is about 0.21％ (volume fraction),which is 5.2 times of that before heat treatment.The stress rupture properties of the as-cast alloy and the alloys after different solution heat treatment at 1 360 ℃ and 1 365 ℃ are investigated respectively at the conditions of 1 080 ℃/190 MPa,1 100℃/140 MPa and 1 150 ℃/83 MPa.The results show that the heat treatment significantly improves the stress rupture properties,and the higher solution heat treatment temperature is,the longer the stress rupture lives are.During the process of high temperature stress rupture,most of cracks distribute in the interdendritic and cracks initiat from the (γ+-γ') eutectic in the as-cast alloy.The alloy with solution heat treatment at 1 360 ℃ has some cracks which distribute both in the dendritic core and interdendritic area.A large amount of TCP(topologically close-packed) precipitation distributes in the dendritic core possibly due to the residual segregation of Re.However,as the alloy with solution heat treatment at 1 365 C,there is less TCP precipitation.关键词
第三代单晶高温合金/固溶热处理/显微组织/持久性能Key words
the third generation single crystal superalloy/solution heat treatment/microstructure/stress rupture property分类
矿业与冶金引用本文复制引用
方向,赵云松,张剑,杨振宇,姜华,杨岩,陈昊,吴庆辉,骆宇时..固溶热处理对一种第三代镍基单晶高温合金组织及高温持久性能的影响[J].重庆大学学报,2017,40(10):87-98,12.
