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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of Ni-based Superalloy K418 Produced by the Continuous Unidirectional Solidification Process
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Microstructure and Mechanical Properties of Ni-based Superalloy K418 Produced by the Continuous Unidirectional Solidification Process

机译：连续单向凝固过程生产的Ni基超合金K418的微观结构和力学性能

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摘要

Adopting effective strategies to control the solidification structure of Ni-based superalloys is a very interesting subject for metallurgists. Despite the achievement of developing and applying the continuous unidirectional solidification process in simple alloys, the utilization of this process for K418 alloys has been ignored. The microstructure and mechanical properties of a K418 alloy ingot produced by the continuous unidirectional solidification process were investigated. We found that the gamma dendrites were typically cross-shaped in the transverse section. The orientation of surviving grains along the casting direction was during competitive growth. The secondary dendrite arm spacing was 32.3 +/- 2.5 mu m at a cooling rate of 1.75 +/- 0.35 degrees C/s from the surface to the center of the K418 alloy ingot. Due to the higher cooling rate than that of the conventional casting process, a more uniform microstructure and finer gamma ' precipitation were obtained in the ingot. Thus, compared with the conventional casting, the tensile strength and the elongation are increased by 8.4 and 21.3%, respectively, at 25 degrees C. The tensile strength and elongation increased by 15.2 and 49.3%, respectively, at 800 degrees C. In addition, the fracture surfaces exhibited numerous typical dimples and dendritic fracture characteristics.
机译：采用有效的控制Ni基超合金的凝固结构是冶金师的一个非常有趣的主题。尽管在简单的合金中实现了开发和应用连续的单向凝固过程，但忽略了K418合金的利用。研究了通过连续单向凝固过程产生的K418合金锭的微观结构和力学性能。我们发现伽马树突通常在横截面中交叉。沿着铸造方向的存活颗粒的取向在竞争性增长期间。次级树枝状臂间距为32.3 +/-2.5μm，冷却速率为1.75 +/- 0.35℃/ s，从表面到K418合金锭的中心。由于较高的冷却速度比传统铸造过程的冷却速度较高，在铸锭中获得了更均匀的微观结构和更细的γ'沉淀。因此，与传统铸造相比，拉伸强度和伸长率分别在25℃下分别增加了8.4％和21.3％。拉伸强度和伸长率分别在800℃下分别增加了15.2和49.3％。此外，裂缝表面表现出许多典型的凹痕和树突骨折特性。

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