摘要
研究了微量元素Mg及δ相对GH169(INCONEL718)高温合金力学性能的影响结果表明,Mg含量从30ppm提高到70ppm,合金可以在保持高强度下进一步改善塑性,特别可提高在使用条件下的一些重要力学性能;δ相的数量、形态及分布明显影响合金的缺口周期持久寿命相应的组织观察表明,Mg在一定程度上也影响δ相的?些特性,因此通过控制Mg含量可控制δ相的数量,形态及分布特征。
Micro-alloying of Mg, ranged from 30 to 70 ppm, may improve the high tem-perature ductility, stress rupture, especially, certain important mechanical properties, such ascyclic stress rupture, creep and fatigue interaction and crack propagation rate. The quantity,morphology and distribution of δ-phase may obviously influence the notched cyclic stressrupture life. The relevant microstructure shows that the Mg may also influence to a certain ex-tent on the feature of δ-phase. Thus, keeping the Mg and δ-phase under control may furtherimprove the mechanical properties of GH169 alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第6期A262-A267,共6页
Acta Metallurgica Sinica
关键词
Δ相
镁
耐热合金
力学性质
superalloy GH169
mechanical property
δ-phase
Mg
creep and fatigue interaction
crack propagation rate
