王鲁,杨钢,刘正东,汪力,马龙腾,杨志强.长期时效对一种镍基合金的组织与性能影响[J].稀有金属材料与工程,2018,47(3):961~967.[WANG Lu,YANG Gang,LIU Zhen-dong,WANG Li,MA Longteng,YANG Zhiqiang.Effects of long-term aging on microstructure and properties of a nickel-base alloy[J].Rare Metal Materials and Engineering,2018,47(3):961~967.]
长期时效对一种镍基合金的组织与性能影响
投稿时间:2016-01-20  修订日期:2016-04-21
中文关键词:  镍基合金  USC141  γ′相  碳化物
基金项目:国家863项目(2012AA03A502)
中文摘要:
      研究了一种镍基合金USC141在700℃长期时效过程中组织与性能的变化。研究结果表明,随时效时间延长,合金的室、高温强度一直保持在较高水平,而晶界碳化物的长大粗化以及逐渐连续成链状,会使得合金的塑性和韧性逐渐下降。时效过程中,合金中M23C6的析出量缓慢增加,而合金中M6C型碳化物的演变过程包括三个阶段:①M6C→M12C转变阶段,主要由Mo和Ni元素的扩散进入引起,碳化物总量显著增加; ②碳化物稳定阶段,碳化物类型以及析出量变化不大;③ M12C进一步析出、粗化阶段,主要由Mo元素的扩散进入引起,晶内新析出呈薄片状的M12C碳化物。合金中的γ′相的析出行为也包括三个阶段:① γ′相快速析出长大阶段,同时颗粒大小趋于均匀化;② γ′相缓慢析出长大阶段,γ′相的尺寸和析出量缓慢增加;③ γ′相粗化、融合阶段,相邻较小尺寸的γ′颗粒接触后融合成较大尺寸γ′颗粒,使得部分γ′相颗粒明显粗化以及总体颗粒尺寸的分布散度显著增加。
Effects of long-term aging on microstructure and properties of a nickel-base alloy
英文关键词:nickel-base alloy  tungsten  γ′ phase  carbides
英文摘要:
      It was investigated that the microstructure and mechanical property evolution of a supperalloy USC 141 under aging 10000h at 700oC in this paper. The results show that both of the strengths of the alloy tested at room temperature and 700oC were maintained at high level during long-term aging, while the coarsening behavior of carbides along grain boundary, which transformed in a shape of chain generally, leads to decrease plasticity and toughness. During the process of long-term aging,the precipitation of M23C6 showed a trend of slow increasing. Whereas the evolution of M6C type carbide in this alloy consists of three stages. The first stage could be marked as the continuum transformation of M6C to M12C, which was induced by the diffusion of Mo and Ni. At the second stage, the carbide type and the precipitation of carbides changed little. At the third stage, M12C carbides further coarsened afterwards by the diffusion of Mo, and M12C inside grains shows a shape of plate. The microstructure evolution of γ′ precipitates could be divided into three stages as well. The formation and initial grow up fastly of γ′ was resulted from the diffusion of Cr, and the γ′ particles were distributed finely during the first stage. At the second stage, the means size and precipitation of γ′ increase slowly. The last stage was marked by the coarsening behavior of γ′, mainly resulting from the coalescence of adjacent γ′ particles, and finally exhibited higher dispersion level of particle size distribution.
作者单位E-mail
王鲁 钢铁研究总院特殊钢研究所 wanglu861219@163.com 
杨钢 钢铁研究总院特殊钢研究所 yanggang@nercast.com 
刘正东 钢铁研究总院特殊钢研究所  
汪力 湖南人文科技学院  
马龙腾 钢铁研究总院特殊钢研究所  
杨志强 钢铁研究总院特殊钢研究所  
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