Re对耐腐蚀镍基定向高温合金组织及持久寿命的影响  

Effect of Re on Microstructure and Stress-Rupture Life of Corrosion Resistant DS Ni-Base Superalloy

作　　者：杨海青[1] 李青[1] 肖程波[1] 胡聘聘[1] 

机构地区：[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

出　　处：《稀有金属》2012年第4期547-551,共5页Chinese Journal of Rare Metals

基　　金：重点实验室基金项目(9140C4301050801);国家自然科学基金项目(50801058);国家航空基金项目(20085321009);国家工信部科技专项基金项目(2009ZX04006-041)资助

摘　　要：优化设计了4种不同Re含量的耐腐蚀定向镍基高温合金,含Re分别为0%,1%,2%和3%(质量分数)。对比了不同Re含量合金的铸态枝晶、γ'相形貌及持久性能试样的断口筏排化组织,测试了不同Re含量合金热处理态的980℃/200 MPa持久寿命,研究了Re对耐腐蚀镍基定向合金组织及持久寿命的影响。研究表明:随着Re含量的增加,合金的一次枝晶间距减小;γ'相尺寸减小,立方化程度增加;蠕变试样的筏排组织更加细化、完善与稳定,因此,合金持久寿命提高。Four Ni-based superalloys with varying rhenium contents （0%, 1%, 2% and 3% （mass fraction）, respectively） were prepared to investigate the effects of Re content on the microstructure and the stress-rupture life of the superalloys. The as-cast primary dendritic arm spacing of the four alloys were compared, and the precipitates of as-cast and aged alloys were studied. The stress-rup- ture life at 980 ℃/200 MPa were tested and the rafting microstructure were analyzed with varying Re contents. The results showed that with the increase of Re contents, the primary dendritic arm spacing decreased; the size of the secondary y^1 precipitates decreased; and the morphology of y^1 precipitates became more cubic due to the enlargement of lattice misfit moreover, well rafting microstructure formed with larger driving force because of larger lattice misfit. As a result, the stress-rupture increased.

关 键 词：耐腐蚀高温合金 RE 微观组织 持久寿命 

分 类 号：TG132.33[一般工业技术—材料科学与工程]