摘要
在试验合金中,1600℃熔体处理对凝固后组织和性能产生显著影响。经1600℃熔体处理后,合金样品二次枝晶间距显著降低,元素偏析情况得到有效改善,凝固过程析出的TCP相数量明显减少,热处理后γ″析出相也更加细小均匀。熔体处理对合金室温和700℃拉伸强度影响不大,但却显著提高合金的拉伸塑性和700℃/620MPa持久性能。在1600℃熔体处理10min时,合金的综合力学性能最佳;延长熔体处理时间至15min时,合金力学性能呈下降趋势。
Effect of melt treatment on the microstructure and mechanical properties of a modified inconel 718C alloy was studied in this paper. The results show that, microstructure of finer dendrite, lower segregation and less amount of Laves phase is obtained after melt treatment. Also, smaller γ＇＇ phases with more uniform distribution are precipitating in the specimen via melt treatment. Melt treatment shows no obvious effect on the 25℃ and 700℃ tensile strength, while it evidently improves the tensile plasticity and the stress-rupture property. Specimens via melt treatment at 1 600 ℃ for 10 minutes exhibit best mechanical properties. Extended melt treatment after 10 minutes degrades the mechanical properties.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第3期248-250,254,共4页
Foundry
基金
国家863计划资助项目(2002AA305208)
关键词
高温合金
熔体处理
偏析
力学性能
superalloy
melt treatment
segregation
mechanical property
