始锻温度对IN718合金锻件性能和组织的影响

董海澎; 何曲波; 王方军; 周大地; 吴畏; 蒋威; 徐永福; 杨承刚; 吴国蓁

doi:10.3969/j.issn.1674-6457.2025.10.021

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (10) : 207-215. DOI: 10.3969/j.issn.1674-6457.2025.10.021

先进制造技术与装备

始锻温度对IN718合金锻件性能和组织的影响

董海澎^1,2,3, 何曲波^1,2,3, 王方军^1,2,3, 周大地^1,2,3, 吴畏^1,2,3, 蒋威^1,2,3, 徐永福^1,2,3, 杨承刚^4,*, 吴国蓁^1,2,3

作者信息 +

Influence of Initial Forging Temperature on Properties and Microstructure of IN718 Alloy Forgings

DONG Haipeng^1,2,3, HE Qubo^1,2,3, WANG Fangjun^1,2,3, ZHOU Dadi^1,2,3, WU Wei^1,2,3, JIANG Wei^1,2,3, XU Yongfu^1,2,3, YANG Chenggang^4,*, WU Guozhen^1,2,3

Author information +

文章历史 +

摘要

目的深入研究IN718合金的热变形行为,以提升合金锻件的性能。方法研究了5种不同始锻温度（930、980、1 040、1 080、1 120 ℃）对IN718合金锻件微观组织及性能的影响。通过室温拉伸实验评估合金的力学性能,并利用光学显微镜、扫描电镜、能谱分析及电子背散射衍射对微观组织进行表征。结果在始锻温度930 ℃和980 ℃下,在IN718合金的晶界处观察到少量的动态再结晶小晶粒,这些再结晶小晶粒形成了典型的项链状拓扑结构。合金强度的提升主要归因于位错强化,位错作用导致930 ℃和980 ℃试样的屈服强度分别提高了215 MPa和193 MPa。而在1 040、1 080、1 120 ℃温度下,合金呈现明显的等轴晶状态。强度的提升主要归因于细晶强化,晶界强化分别使其屈服强度提高了270、283、284 MPa。结论通过探究不同始锻温度下的微观组织及力学性能,明确了在该实验条件下获得均匀细化晶粒组织的温度范围,揭示了热变形温度对微观组织演化及力学性能的影响机制,从而为开发高性能镍基合金提供了数据支撑。

Abstract

The work aims to conduct an in-depth study on the thermal deformation behavior of IN718 alloy to enhance the performance of alloy forgings. The effect of five levels of initial forging temperature (930, 980, 1 040, 1 080, and 1 120 ℃) on the microstructure and properties of IN718 alloy forgings was researched. The mechanical properties of the alloy were evaluated through room temperature tensile tests, and the microstructure was characterized by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and electron backscatter diffraction. The results showed that at initial forging temperature of 930 ℃ and 980℃, small dynamic recrystallized grains were observed at the grain boundaries, forming a typical necklace-like topological structure. The increase in alloy strength was primarily attributed to dislocation strengthening, with the dislocation effects resulting in yield strengths increasing by 215 MPa and 193 MPa for the 930 ℃ and 980 ℃ samples, respectively. At temperature of 1 040, 1 080, and 1 120 ℃, the alloy exhibited a distinct equiaxed grain structure. The strength improvement was primarily attributed to grain refinement strengthening. Grain boundary strengthening increased the yield strengths by 270 MPa, 283 MPa, and 284 MPa, respectively. By investigating the microstructure and mechanical properties at different initial forging temperature, the temperature range for achieving a uniformly refined grain structure under the experimental conditions is determined. The influence mechanism of hot deformation temperature on microstructure evolution and mechanical properties is revealed, thus providing data support for the development of high-performance nickel-based alloys.

导出引用

董海澎, 何曲波, 王方军, 周大地, 吴畏, 蒋威, 徐永福, 杨承刚, 吴国蓁. 始锻温度对IN718合金锻件性能和组织的影响[J]. 精密成形工程. 2025, 17(10): 207-215 https://doi.org/10.3969/j.issn.1674-6457.2025.10.021

DONG Haipeng, HE Qubo, WANG Fangjun, ZHOU Dadi, WU Wei, JIANG Wei, XU Yongfu, YANG Chenggang, WU Guozhen. Influence of Initial Forging Temperature on Properties and Microstructure of IN718 Alloy Forgings[J]. Journal of Netshape Forming Engineering. 2025, 17(10): 207-215 https://doi.org/10.3969/j.issn.1674-6457.2025.10.021

中图分类号： TG132.3+2

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