热处理制度对超超临界电站用GH80A合金组织和性能的影响  

Influence of Heat Treatments on Microstructures and Properties of GH80A Superalloy for Buckets of USC Steam Turbines

作　　者：于秋颖[1] 董建新[1] 张麦仓[1] 谢锡善[1] 姚志浩[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2013年第7期1507-1512,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金;上海宝钢集团公司联合资助重点项目(50831008)

摘　　要：系统研究了不同固溶处理、固溶＋时效处理以及550～750℃长期时效10000h后GH80A合金组织和性能的变化规律。结果表明：γ’相的开始析出温度为930-950℃；冷却介质比固溶温度对冷却γ’相的影响大，水淬能够抑制GH80A合金γ＇相的析出；时效温度对一次γ’相有重要影响；双时效处理才析出二次γ’相；随固溶温度升高，合金单／双时效后的强度稍有降低而塑性升高：长期时效温度不高于700℃时合金的组织稳定性良好，一次γ’相的粗化机制在700℃以下以扩散控制为主，750℃以界面控制为主。The microstructure evolution and property variation of GH80A superalloy after a series of solution heat treatments, single or double aging treatments and long time aging at 550-750 ~C for 10 000 h were investigated. Results show that the precipitation temperature of γ＇ precipitates is identified as 930-950 ~C. Theγ＇ precipitation could be inhibited by water quenching and cooling medium shows more effects on cooling γ＇ precipitate than the solution temperature. Primary γ＇ precipitates are strongly influenced by aging temperature and the precipitation of secondary γ＇ precipitates just begins at double aging stage. The tensile strength after single/double aging is decreased a little with the solution temperature increasing while the plasticity is increased. Long-time aging microstructure shows good stability below 700 ℃ and the coarsening of primary γ＇ precipitates proceeds by volume diffusion below 700 ℃ while by interface controlling at 750 ℃.

关 键 词：GH80A高温合金 热处理 长期时效 显微组织 性能 

分 类 号：TG166[金属学及工艺—热处理]