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Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-08-15 , DOI: 10.1007/s12613-019-1949-8
Zhan Qiao , Chong Li , Hong-jun Zhang , Hong-yan Liang , Yong-chang Liu , Yong Zhang

Inconel 718 is a Ni-Fe-based superalloy widely used in aerospace engines because of its excellent mechanical properties. However, the inferior stability of the γ″ phase limits the application of Inconel 718, which coarsens rapidly at temperatures greater than 650°C. Further improving the temperature tolerance of Inconel 718 requires optimization of the phase configuration via modification of the alloy’s chemical composition. Given the aforementioned objective, this work was conducted to study the precipitation behavior and thermal stability of the strengthening phases with various structures in modified Inconel 718 alloys by tailoring the Al/Ti ratio. With increasing Al/Ti ratio, three particle configurations were formed: γ′/γ″ composite, isolated γ′, and γ′/γ″/γ′ composite particles. The results of aging tests demonstrate that the isolated γ′ and the γ′/γ″/γ′ composite structure exhibited better thermal stability at temperature as high as 800°C. The isolated γ′ exhibited a reduced coarsening rate compared with the γ′/γ″/γ′ composite particles because the isolated γ′ phase was rich in Al, Ti, and Nb. However, the γ′/γ″ composite particles coarsened and decomposed rapidly during aging at temperatures greater than 700°C because of the lower stability resulting from the larger number of γ″ particles. The obtained results provide necessary data for the compositional optimization of novel 718-type alloys.



中文翻译:

改变相构型的718型改性合金的高温稳定性评估

Inconel 718是一种Ni-Fe基高温合金,因其出色的机械性能而广泛用于航空发动机。但是,γ''相的较差的稳定性限制了Inconel 718的应用,它在高于650°C的温度下会迅速变粗。为了进一步提高Inconel 718的温度耐受性,需要通过改变合金的化学成分来优化相结构。鉴于上述目标,进行了这项工作,以通过修改Al / Ti比例来研究改性Inconel 718合金中具有各种结构的强化相的析出行为和热稳定性。随着Al / Ti比值的增加,形成了三种颗粒形态:γ'/γ''复合颗粒,孤立的γ'和γ'/γ''/γ'复合颗粒。老化测试结果表明,分离出的γ'和γ'/γ''/γ'复合结构在高达800℃的温度下表现出更好的热稳定性。与γ′/γ″ /γ′复合颗粒相比,分离的γ′表现出降低的粗化速率,因为分离的γ′相富含Al,Ti和Nb。但是,γ'/γ''复合粒子在超过700℃的温度下的时效过程中会迅速变粗并分解,这是由于大量的γ''粒子导致的稳定性降低。获得的结果为新型718型合金的成分优化提供了必要的数据。与γ′/γ″ /γ′复合颗粒相比,分离的γ′表现出降低的粗化速率,因为分离的γ′相富含Al,Ti和Nb。但是,γ'/γ''复合粒子在超过700℃的温度下的时效过程中会迅速变粗并分解,这是由于大量的γ''粒子导致的稳定性降低。获得的结果为新型718型合金的成分优化提供了必要的数据。与γ′/γ″ /γ′复合颗粒相比,分离的γ′表现出降低的粗化速率,因为分离的γ′相富含Al,Ti和Nb。但是,γ'/γ''复合粒子在超过700℃的温度下的时效过程中会迅速变粗并分解,这是由于大量的γ''粒子导致的稳定性降低。获得的结果为新型718型合金的成分优化提供了必要的数据。

更新日期:2020-08-15
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