热处理制度对GH706高温合金持久性能的影响  

Effects of Heat Treatment on Stress Rupture Properties of GH706 Superalloy

作　　者：信昕[1] 孙文儒[1] 冯贞伟[2] 祁峰[1] 李晓光[2] 杨洪才[3] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]沈阳黎明发动机(集团)责任有限公司,沈阳110043 [3]东北大学材料与冶金学院,沈阳110004

出　　处：《材料研究学报》2010年第6期649-654,共6页Chinese Journal of Materials Research

摘　　要：不同热处理制度对GH706高温合金持久性能影响的研究结果表明,固溶加低温时效的两段热处理使合金中析出的η相呈胞状紧密排列于晶界,强化晶界,获得较长的持久寿命。增加稳定化处理的三段热处理合金,晶界η相以长针状析出,并在其周围形成γ′、γ″相贫化区,贫化区强度较低,弱化了晶界,使得裂纹易于萌生,且易于连通形成扩展通道,降低了持久寿命。直接时效(DA)处理的合金中η相在晶界呈短捧状分散排列,可以起到强化晶界的作用,而η相间的无析出区可以钝化裂纹的萌生和扩展,从而获得最长的持久寿命和最高的持久塑性。The stress rupture properties of GH706 superalloy at diffierent heat treatments are studied in precent work.For two-step treated GH706 alloy,cellular n.particles precipitate closely at the grain boundaries,strengthening grain boundaries,leading to the prolongation of the stress rupture life.In three-step alloy treated,the needle-likeηphases are formed at the grain boundaries,which enlarge the area of the depleted zone of theγ＇ andγ＂ strengthening phases.This zone characterizes with poor strength, which deteriorates grain boundaries.Cracks are prone to initate atγ＇ andγ＂ depleted zone,then the cracks are easily to propagate.Consequently,the stress rupture life is reduced.For direct aging（DA） treated alloy,the rod-likeηparticles precipitate loosely at the grain boundaries,which makes grain boundary strengthening.The free precipitated phase zone is formed betweenηparticles,which can passivates crack initiation and propagation.This may lead to the longest stress rupture life and the best rupture elongation of the DA GH706 alloy among three kind heat-treated alloys.

关 键 词：金属材料 GH706高温合金 热处理 Η相 持久性能 

分 类 号：TG14[一般工业技术—材料科学与工程]