微量元素对低膨胀Fe-Ni基高温合金抗氧化性能的影响  

THE OXIDATION-RESISTANCE PROPERTIES OF LOW-EXMNSION SUPERALLOYS

作　　者：邓波[1] 陈淦生[1] 龙正东[1] 林平[1] 仲增墉[1] 

机构地区：[1]钢铁研究总院高温材料所,北京100081

出　　处：《金属学报》2000年第2期155-158,共4页Acta Metallurgica Sinica

摘　　要：为了保持低的膨胀系数，低膨胀ＧＨ９０９合金中不含Ｃｒ，导致合金的抗氧化性能较差为了解决这一问题，在ＧＨ９０９合金的基础上调整成分，加入少量Ｃｒ和稀土元素Ｙ与Ｌａ等，并提高Ｃｏ／（Ｃｏ＋Ｎｉ）比例，使合金在膨胀系数基本未变的情况下，抗氧化性能得到较明显的改善用Ｘ射线衍射、金相显微镜、扫描电镜等检查了合金的氧化层，发现ＧＨ９０９合金氧化层很厚，其主要成分为Ｆｅ_３Ｏ_４， Ｆｅ_３Ｏ_２等，氧化层组织较疏松，有内氧化现象加入Ｃｒ和稀土元素的合金氧化层较薄，氧化层主要成分还有Ｃｒ_２Ｏ_３等，氧化层组织致密，未见内氧化。温度愈高，Ｃｒ和稀土的有益效果愈明显，它们有效地抑制了氧的扩散。To obtain low thermal expansion coefficient, the alloying element Cr is removed from the alloy GH909, which made the oxidation resistance property of GH909 very poor. To solve this problem, a small amount of alloying element Cr, and rare earth elements Y and La were added into the alloy GH909 and the rate of Co/(Co+Ni) was increased, these made the oxidation resistant property improved obviously, while the expansion coefficient keeps unchanged obviously. The X-diffraction, optical and electrical microscope were used to inspect the structure of oxidation layer. For the alloy GH909 the layer of oxidation is very thick and the main constitution is Fe3O4, Fe3O2 and so on f the structure of oxidizing layer is looser and the interior-oxidation appeared. For the alloy adding small amount of Cr and rare earth elements on the GH909, the layer of oxidation is very thin, the main constitution includes Cr_2O_3, aside from Fe_3O_4, Fe3O2, the structure of oxidation layer is very closed and the interior-oxidation disappeares. The elements of Cr, Y and La hinder the diffusion of element O effectively, and the above beneficial effect increases with increasing the temperature.

关 键 词：低膨胀 Fe-Ni基 高温合金 抗氧化性能 

分 类 号：TG132.11[一般工业技术—材料科学与工程] TG132.32[金属学及工艺—合金]