主合金成分对K477合金流动性和力学性能的影响

夏兴义; 郑行; 张伟伟; 王联波; 易出山; 雷四雄; 祝国梁; 谭庆彪

doi:10.3969/j.issn.1674-6457.2025.09.016

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (9) : 167-175. DOI: 10.3969/j.issn.1674-6457.2025.09.016

高温合金成形

主合金成分对K477合金流动性和力学性能的影响

夏兴义¹, 郑行², 张伟伟², 王联波^1,*, 易出山², 雷四雄², 祝国梁³, 谭庆彪^3,*

作者信息 +

Effect of Major Alloying Elements on Fluidity and Mechanical Properties of K477 Superalloy

XIA Xingyi¹, ZHENG Hang², ZHANG Weiwei², WANG Lianbo^1,*, YI Chushan², LEI Sixiong², ZHU Guoliang³, TAN Qingbiao^3,*

Author information +

文章历史 +

摘要

目的对比研究2种不同成分K477合金的微观组织、力学性能和铸造工艺性能,为开发综合性能优异的K477合金成分提供实验依据和理论支撑。方法采用差示扫描量热仪（DSC）测定了合金的凝固特征温度;利用光学显微镜（OM）观察了合金的微观组织;通过拉伸实验检测了高温力学性能,并利用扫描电子显微镜（SEM）观察了断口形貌;利用螺旋形流动性模型评价了合金的充型能力。结果与低合金化K477合金相比,高合金化K477合金的凝固温度区间缩小了10.20 ℃,且MC、M₃B₂和γ'相含量增加;高合金化K477合金650 ℃抗拉强度和屈服强度分别达到1 023 MPa和823 MPa,相较于低合金化K477合金,分别提高了约35%和19%;高合金化K477合金2 mm薄壁件充型长度达到8.1 mm,较低合金化K477合金提升了68.75%。结论 K477合金的主合金成分变化显著影响了合金的凝固特征温度、微观组织特征、力学性能和铸造工艺性能。通过优化主合金元素配比,可获得兼具铸造工艺性能和力学性能的高温合金。

Abstract

The work aims to comparatively study the microstructure, mechanical properties and castability of two kinds of K477 alloys with different compositions, to provide experimental evidence and theoretical support for the development of a K477 alloy composition with superior overall performance. The solidification characteristic temperature of the two alloys were determined with the differential scanning calorimetry (DSC). The microstructures were observed with an optical microscope (OM). The high-temperature mechanical properties were measured by tensile test, and the fracture morphologies were observed with a scanning electron microscope (SEM). The filling ability was finally evaluated with a spiral fluidity-testing model. Compared with the low-alloyed K477 alloy, the solidification temperature range of the high-alloyed K477 alloy was reduced by 10.20 ℃, and the mass fractions of MC, M₃B₂, and γ′ phases increased. The tensile strength and yield strength of the high-alloyed K477 alloy at 650 ℃ reached 1 023 MPa and 823 MPa, respectively, which were approximately 35% and 19% higher than those of the low-alloyed K477 alloy. Furthermore, the filling length of the 2 mm thin-walled section reached 8.1 mm, representing a 68.75% improvement compared to the low-alloyed one. The major alloying elements in the K477 superalloy determine the solidification characteristic temperature, microstructures, mechanical properties and castability. By optimizing the proportion of major alloying elements, it is possible to achieve a combination of good fluidity and mechanical properties.

导出引用

夏兴义, 郑行, 张伟伟, 王联波, 易出山, 雷四雄, 祝国梁, 谭庆彪. 主合金成分对K477合金流动性和力学性能的影响[J]. 精密成形工程. 2025, 17(9): 167-175 https://doi.org/10.3969/j.issn.1674-6457.2025.09.016

XIA Xingyi, ZHENG Hang, ZHANG Weiwei, WANG Lianbo, YI Chushan, LEI Sixiong, ZHU Guoliang, TAN Qingbiao. Effect of Major Alloying Elements on Fluidity and Mechanical Properties of K477 Superalloy[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 167-175 https://doi.org/10.3969/j.issn.1674-6457.2025.09.016

中图分类号： TG146

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