Title: Evaluation of properties in Inconel 718 during magnetic annealing

Authors: Vishnu Govindrao Sanap; Vasusev Dhondiram Shinde

Addresses: Mechanical Engineering, Shivaji University, Kolhapur, 416008, Maharashtra, India ' Department of Mechanical Engineering, Textile and Engineering Institute, Ichalkaranji District, Kolhapur, India

Abstract: Wrought nickel alloys harden considerably during cold forming. A round bar of Inconel 718 material is difficult for machining. The grain growth occurs during the annealing heat treatment process during furnace cooling in Inconel 718. To avoid grain growth during the annealing process and to reduce hardness, an electromagnetic field will be applied. A magnetic field enhances grain orientation and texture development and avoids grain growth during annealing. Inconel 718 specimen samples are heated in a furnace at a temperature of 850-950°C, soaked, and cooled under a magnetic field with 467, 515, 581, and 641 gauss densities maintained during cooling for 10 and 15 minutes. Optical microscopic studies showed that grain coarsening was restricted due to magnetic annealing in Inconel 718, as grain size remained intact due to the magnetic field effect during cooling. The micro-hardness was found to reduce after magnetic annealing from 479 HV to 279 HV.

Keywords: magnetic annealing; Inconel 718; micro-hardness; grain size; magnetic field; cooling time.

DOI: 10.1504/IJMATEI.2025.149444

International Journal of Materials Engineering Innovation, 2025 Vol.16 No.4, pp.352 - 366

Received: 20 Aug 2023
Accepted: 30 Nov 2023
Published online: 31 Oct 2025 *

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