Correlating Hot Deformation Parameters with Microstructure Evolution During Thermomechanical Processing of Inconel 718 Alloy

Gupta, Chirag; Jha, Jyoti S.; Jayabalan, Bhagyaraj; Gujrati, Rajat; Alankar, Alankar; Mishra, Sushil

doi:10.1007/s11661-019-05380-0

Cited by 21 publications

(1 citation statement)

References 60 publications

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“…The refined grains did not improve the microhardness of the surface because the strengthening phase was dissolved at the same time by the heat treatment. The material composition tended to be uniform after the heat treatment was performed, which resulted in the disappearance of the microhardness gradient on the machined surface [28].…”

Section: Relationship Between Microstructure and Work Hardeningmentioning

confidence: 99%

Effects of Sequential Operation with Heat Treatment and Mechanical Milling on Work Hardening for Superalloy GH4169

Zhu

Liu

Ren

et al. 2021

Metals

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Engineering components are usually manufactured with sequential production processes. Work hardening due to previous production processes affects the machinability of the workpiece in subsequent operations. In this research, the surface work hardening of a workpiece manufactured by two sequential processes with heat treatment/milling (HT + M) and milling/heat treatment (M + HT) of superalloy GH4169 was investigated. First, the surface microstructure characteristics, including plastic deformation and grain size of the machined workpiece surface processed by the two sequential processes, were quantitatively presented. Then, the microhardness on the machined workpiece surface and its cross-section was measured and analyzed. Finally, a surface microhardness calculation model considering twin boundary deformation was proposed. Here, we also present the microstructure evolution principle of the machined workpiece surface by the two sequential processes. It was found that the degree of work hardening of HT + M machining was 179%, whereas that of M + HT was only 101%. The research results can be applied to the optimized selection of process sequence for manufacturing superalloy GH4169.

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Section: Relationship Between Microstructure and Work Hardeningmentioning

confidence: 99%