摘要
1.前言 DD3合金是国产第一代单晶涡轮叶片材料,它去除了普通铸造高温合金中常存的微量合金化元素,使合金的初熔温度大大提高。这一特性使高温固溶处理得以在单晶合金中广泛应用,大幅度提高了合金的力学性能。同时,微量成分的调整,使得合金的凝固特性产生明显的变化。
The liquidus and incipient melting temperatures of DD3 superalloy are about 23℃ and 60℃ higher than those of K3 alloy respectively. As Ti content decreases to 1.5%, the eutectic(γ+ γ')in the alloy can be eliminated. This raises the liquidus and solidus temperatures 10℃ and 60℃ further.The effect of carbon on solidus and liquidus is far less than those of Zr and B. In some degree the influence of C is inferior to Ti. The DD3 superalloy with low C content and without eutectic(γ + γ')has higher resistance to hot cracking.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1989年第1期A089-A092,共4页
Acta Aeronautica et Astronautica Sinica
关键词
镍基合金
单晶
DD3合金
凝固
nickel-base superalloys, isothermal solidification, pre- cipitation of primary phases, effbct of carbon and titanium.
