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

DONG Haipeng; HE Qubo; WANG Fangjun; ZHOU Dadi; WU Wei; JIANG Wei; XU Yongfu; YANG Chenggang; WU Guozhen

doi:10.3969/j.issn.1674-6457.2025.10.021

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (10) : 207-215. DOI: 10.3969/j.issn.1674-6457.2025.10.021

Advanced Manufacturing Technology and Equipment

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

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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.

Key words

IN718 alloy / tensile properties / microstructure / grain refinement strengthening / dislocation strengthening

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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

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