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FGH96高温合金中一次碳化物形成规律
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-10-17
基于Thermo-Calc热力学计算软件及相应的Ni基数据库，对FGH96高温合金中一次碳化物的生成机理进行研究，计算FGH96高温合金可能的平衡析出相及C、N、Nb、Ti元素对合金中一次碳化物相MC+M(C,N)析出行为的影响，对比分析FGH96高温合金中一次碳化物相的计算结果与扫描电镜图及能谱分析的化学成分。
FGH96高温合金中一次碳化物形成规律Formation mechanism of primary carbides in FGH96 superalloy
基于Thermo-Calc热力学计算软件及相应的Ni基数据库，对FGH96高温合金中一次碳化物的生成机理进行研究，计算FGH96高温合金可能的平衡析出相及C、N、Nb、Ti元素对合金中一次碳化物相MC+M(C,N)析出行为的影响，对比分析FGH96高温合金中一次碳化物相的计算结果与扫描电镜图及能谱分析的化学成分。结果表明：C含量对一次碳化物相的析出量影响较大，而对析出温度影响较小；N含量对析出温度有非常明显的影响，而对一次碳化物相的析出量影响较小；Nb和Ti含量对FGH96高温合金中一次碳化物相的析出行为只有轻微的影响。因此，FGH96高温合金中一次碳化物相的析出行为主要受C和N的影响。由计算得出的一次碳化物相的成分变化结果结合扫描电镜图和能谱分析结果可推断出，FGH96高温合金中含有N时，首先从液态合金中析出含有微量C的氮化物TiN，两相区析出的MC型碳化物会在TiN表面析出，形成以TiN为核心的一次碳氮化物M(C,N)。
The formation mechanism of primary carbides in FGH96 superalloy was investigated based on the Thermo- Calc thermodynamic software combined with the related nickel-based database. Using Thermo-Calc thermodynamic software, the possible equilibrium precipitation phases were calculated, and the effects of C, N, Nb and Ti elements on the precipitation behaviors of the primary carbide phase MC+M(C,N) were investigated. The calculated results of the primary carbide phase in FGH96 superalloy were compared with scanning electric microscope (SEM) image as well as measured chemical composition by energy dispersive spectrometer (EDS) of the FGH96 superalloy samples. The results show that the C content has a large effect on the mass fraction of the precipitated primary carbide phase, and the influence on the precipitation temperature is small. The N content shows a great effect on the precipitation temperature whereas, a very limited effect on the mass fraction of the precipitated primary carbide phase. The contents of Ti and Nb have slight effect on the precipitation behaviors of the primary carbide phase in FGH96 superalloy. Therefore, the contents of C and N control the precipitation behaviors of the primary carbide phase in FGH96 superalloy. By the result of thermodynamic calculation, SEM and EDS, it can be proposed that the primary TiN containing small amount of C first precipitates from the liquid FGH96 superalloy containing N, and then the MC-type carbides precipitate on the surface of TiN in mush zone, and form a type carbonitride with TiN as core.
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