Key Takeaways & Executive Findings
- •• Short-arc machining combined with precision milling enables efficient and high-precision processing of nickel-based superalloys, addressing challenges of traditional methods. • The recast layer formed during short-arc machining exhibits an 85.5% reduction in grain size and a heat-affected layer depth exceeding 400 μm, significantly altering surface microstructure. • Fatigue life correlates strongly with residual stress, grain orientation spread, and geometrically necessary dislocations, providing a basis for process optimization. • Optimal machining parameters (larger axial depth of cut, lower feed per tooth) enhance fatigue life, offering practical guidance for aerospace component manufacturing.
Abstract
Short-arc machining is a novel electrical discharge machining method that utilizes high-energy arc discharge as the energy carrier. Due to its low cost and high processing efficiency, it has been widely applied in the efficient processing of superalloys. To address the challenges of efficient and high-precision processing of superalloys, a processing method combining short-arc machining with precision milling is employed. Advanced material characterization techniques such as electron backscatter diffraction (EBSD) are utilized to analyze the physical properties of the recast layer and surface crystal characteristics. High-temperature low-cycle fatigue life tests are conducted to investigate the correlation between fatigue life and typical surface integrity parameters (surface roughness, residual stress), as well as crystallographic parameters (grain size, grain orientation spread, geometrically necessary dislocations). Processing parameter optimization is achieved with fatigue life as the target. The results indicate that at high temperatures during short-arc machining, the surface material underwent recrystallisation to form a recast layer with a grain size reduction of 85.5% and a heat affected layer depth of over 400 μm. The trends in fatigue life are consistent with changes in residual stress, grain orientation spread and geometrically necessary dislocations. Selecting a larger axial depth of cut and lower feed per tooth is advantageous for achieving a higher fatigue life. The proposed research provides an instruction for high efficient precision machining of superalloys.
1. Introduction
Efficient processing is a perpetual goal in metal cutting and a significant direction in the development of mechanical processing technology [1]. The objective of efficient processing is to optimize process parameters using advanced processing methods to increase material removal rates or reduce processing time, ultimately lowering production costs. Currently, efficient processing has become an important strategy in the machining of aerospace and aviation components.
Nickel-based superalloys are crucial materials in the aerospace industry, known for their excellent high-temperature strength and structural stability, making them the primary materials for hot-end components such as inlet ducts and combustion chambers [2]. However, the high strength and wear resistance of superalloys pose challenges in traditional metal-cutting processes, including low processing efficiency and high costs [3]. This presents significant challenges in the manufacturing process [4]. Traditional mechanical machining of superalloys often results in poor surface finish, high tool wear rates, and various challenges related to surface integrity, necessitating a shift away from conventional machining methods [5].
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Pai Wang, Wenxiang Zhao, Xibin Wang, Shuyao Liu, Yifan Bai, Hongtao Chen, Zhibing Liu (2025). Research on the Microstructure Characterization and Fatigue Behavior of Nickel-Based Superalloy Subjected to Short-Arc and Milling Composite Processing. Chinese Journal of Mechanical Engineering. https://doi.org/10.1186/s10033-025-01315-6
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Frequently Asked Questions
What is short-arc machining and why is it used for superalloys?
Short-arc machining is a novel electrical discharge machining method that uses high-energy arc discharge as the energy carrier. It is low-cost and highly efficient, making it suitable for processing difficult-to-machine materials like nickel-based superalloys, which are hard and wear-resistant.
How does short-arc machining affect the microstructure of nickel-based superalloys?
Short-arc machining causes surface recrystallization, forming a recast layer with a grain size reduction of 85.5% and a heat-affected layer depth of over 400 μm, as revealed by EBSD analysis.
What is the correlation between fatigue life and surface integrity parameters?
Fatigue life trends are consistent with changes in residual stress, grain orientation spread, and geometrically necessary dislocations, indicating that these parameters significantly influence fatigue performance.
What processing parameters optimize fatigue life in the composite process?
Selecting a larger axial depth of cut and lower feed per tooth is advantageous for achieving higher fatigue life, as demonstrated in the study.
What is the significance of this research for aerospace manufacturing?
The research provides guidance for efficient and high-precision machining of superalloys, which are critical for aerospace hot-end components, potentially reducing costs and improving component reliability.
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