摘要
采用光镜、扫描电镜对1种镍基单晶高温合金的铸态组织和不同温度固溶处理后的组织进行了观察,研究了不同温度固溶处理对γ'相尺寸、γ/γ'共晶、成分偏析的影响。结果表明:合金枝晶间γ'相的固溶温度高于枝晶干γ'相的固溶温度,随固溶处理温度的升高,γ'相尺寸略有增加,γ/γ'共晶量及成分偏析降低;1290℃/4h,AC固溶处理后合金枝晶干、间γ'相全部固溶,1310℃/4h,AC固溶处理后合金中γ/γ'共晶全部消除,1320℃固溶处理时,合金中出现初溶现象;确定1310℃/4h,AC为合金的固溶处理工艺。
A observation was made on the microstructure of a as-east as well as solid-solution treated nickel-base single crystal superalloy at different temperatures using optical microscopy and scanning electron microscopy. The size of gamma', eutectic fractions of gamma/gamma' and compositional segregation under different solid- solution temperatures were investigated. It was shown that the solid-solution temperature for the gamma' phases between dendrites was higher than that on the arms of the dendrites. The size of gamma' was increased and the eutectic fraction of gamma/gamma' as well as compositional segregation decreased with the temperature. The y'phase on the dendrites or between them was entirely solid dissolved at condition of 1 290degreesC, 4h, AC. And eutectic gamma/gamma' phase was ruled out by condition of 1 310degreesC, 4h, AC. Furthermore, increasing the solid-solution temperature to 1 320degreesC, occurred the initial melting in the alloy. By which, the condition of 1 310degreesC, 4h, AC was believed the suitable technique for solid-solution of the alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第4期287-290,共4页
Rare Metal Materials and Engineering
