龚志华,包汉生,殷会芳,杨钢.长时时效对汽轮机叶片用GY200镍基合金组织和性能的影响[J].稀有金属材料与工程,2019,48(4):1281~1287.[Zhi-hua Gong,Han-shen Bao,Hui-fang Yin,Gang Yang.The microstructure and property evolution of the GY200 nickel base alloy for steam turbine blades after long-time aging[J].Rare Metal Materials and Engineering,2019,48(4):1281~1287.]
长时时效对汽轮机叶片用GY200镍基合金组织和性能的影响
投稿时间:2018-03-30  修订日期:2018-04-24
中文关键词:  先进超超临界  GY200镍基合金  叶片  γ′相  粗化速率  
基金项目:国家重点研发计划项目(编号:2016YFB0300203)
中文摘要:
      利用Thermal-calc热力学软件对GY200平衡条件下的析出相进行了计算,并结合金相、扫描、化学相分析等手段研究了700、750℃不同时效时间下先进超超临界电站叶片用GY200镍基合金的组织、性能、碳化物及沉淀强化相的演变。结果表明,GY200镍基合金在700、750℃时效后的强度明显增加,冲击性能稍有下降,在10000h时效时间内合金的各项性能没有明显变化。长时时效后的碳化物主要由M23C6和MC相组成,和热力学软件模拟结果一直,利用W替代Waspaloy中的Mo降低了M6C析出倾向。随着时效时间增加M23C6相含量增加,并呈链状和片状析出在晶界,750℃时效M23C6粗化更加明显;MC相数量在时效3000h后开始下降。700℃时效3000h后,γ′相数量开始增加,5000h-10000h趋于稳定,750℃时效γ′数量基本不变。γ′相在700℃时效稳定性较好,粗化速率较低;750℃时效粗化速率较高,5000h时效后平均尺寸约100nm。
The microstructure and property evolution of the GY200 nickel base alloy for steam turbine blades after long-time aging
英文关键词:Advanced super supercritical  GY200 Nickel base alloy  Blade  γ′phase  coarsening rate  
英文摘要:
      : Thermal-calc thermodynamic software was used to calculate the precipitates in GY200 equilibrium conditions.The microstructure, performance, carbides and γ" phase evolution of GY200 nickel base alloy for the blades of an advanced super supercritical power station at 700 and 750 °C with different aging times were studied by means of metallography, scanning, and chemical phase analysis. The results show that the strength increases significantly after aging, and the impact performance decreases slightly. The carbides mainly consist of M23C6 and MC phases. The replacement of Mo in Waspaloy by W decreases the precipitation tendency of M6C. The content of M23C6 phase increased with the increase aging time, and the carbides separated out as chains and lamellae in the grain boundary. The amount of MC phase began to decrease after aging for 3000 h. The amount of γ" phase increased after aging at 700°C for 3000 h, stabilized after 5000 h, and remained basically unchanged at 750 °C. The γ′ phase has good thermal stability at 700°C with a low coarsening rate. The coarsening rate at 750°C is higher and the diameter of γ′ is about 100nm after aging at 5000h.
作者单位E-mail
龚志华 内蒙古科技大学材料与冶金学院 gzh_2001@163.com 
包汉生 钢铁研究总院,北京  
殷会芳 钢铁研究总院,北京  
杨钢 钢铁研究总院,北京  
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