The Machinability of MAR-M247 Superalloy

Chen, Shao Hsien; Su, Sen Chieh; Chang, Po Chun; Chou, Shuo Yan; Shieh, Kong King

doi:10.4028/www.scientific.net/aef.1.155

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Nickel-based superalloys are known to be particularly difficult to machine compared to traditional alloys. Nickel-based superalloys are difficult to machine for several reasons including their high toughness, high strength of material at elevated temperatures, high degree of work hardening, and poor thermal conductivity [61]. Machining nickel-based superalloys requires special tooling and techniques that increase production times and costs [62].…”

Section: Superalloysmentioning

confidence: 99%

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Dinovitzer¹

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In this research, a wire and arc additive manufacturing process for superalloy Hastelloy X was developed and the resulting material was characterized. The effects of parameters in the TIG based process were investigated for single layer samples using the Taguchi method and an analysis of variance (ANOVA). Multi-layer deposition strategies were also tested and no significant difference was found between printing layers in the same direction or in alternating directions. Due to the excessive heat input of the preliminary trials, three distinct zones were identified and characterized by the size and distribution of the molybdenum carbides within the matrix grain formations. By refining deposition strategies and process parameters, the resulting multi-layer samples exhibited less variation in the size and shape of the molybdenum carbides. Hardness testing confirmed that there is little to no variation in hardness along or across the print direction, suggesting a constant thermal history throughout. Finally, the isothermal oxidation behavior of AM Hastelloy X was compared to the wrought alloy through testing in air at 1080°C. The parabolic oxidation rate constant, k1, of the AM samples was determined to be 4.54×10 -8 g 2 /cm 4 /h. Results suggest that the AM samples may have an advantage in oxidation resistance due to finer grains and perhaps a better composition uniformity. However, weight gains between the wrought and AM samples were quite similar suggesting an equivalent oxidation behavior.

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Section: Superalloysmentioning

confidence: 99%

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Dinovitzer¹

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Machinability of Nickel Based Superalloys: A Review

Thellaputta

Chandra

Rao

2017

Materials Today: Proceedings

157

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Chip Formation Mechanism of Inconel 718: A Review of Models and Approaches

Liu

Wan

Zhang

et al. 2021

Chin. J. Mech. Eng.

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Inconel 718, a nickel, chrome and iron alloy, has special advantages, such as high-temperature strength, thermal resistance and corrosion resistance, which facilitate wide usage in the aerospace industry, especially in the hot sections of gas turbine engines. However, machining this alloy is correlated closely with the material’s inherent properties such as excellent combination of strength, hardness and toughness, low thermal conductivity and the tendency to adhere to cutting tools. This nickel alloy also contains inclusions of hard abrasive carbide particles that lead to work-hardening of the workpiece material and thus abrasive wear of the cutting tool. That is, the machining of Inconel 718 is always influenced by high mechanical and thermal loads. This article reviews the chip formation mechanism of Inconel 718. One of the main characteristics in machining of Inconel 718 is that it will produce serrated or segmented chips in a wide range of cutting speeds and feeds. Existing studies show that the chip serration or segmentation by shear localization affects the machined surface integrity, and also contributes to the chip’s evacuation and the automation of machining operations. Thus, research conclusion indicates that the serrated or segmented chip phenomenon is desirable in reducing the level of cutting force, and detailed analysis of models and approaches to understand the chip formation mechanism of Inconel 718 is vital for machining this alloy effectively and efficiently. Therefore, this article presents some summaries on the models and approaches on the chip formation in machining of Inconel 718.

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The Machinability of MAR-M247 Superalloy

Cited by 4 publications

References 11 publications

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Machinability of Nickel Based Superalloys: A Review

Chip Formation Mechanism of Inconel 718: A Review of Models and Approaches

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