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A detailed investigation of residual stresses after milling Inconel 718 using typical production parameters for assessment of affected depth
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes. University West, Sweden.ORCID iD: 0000-0003-2991-2911
GKN Aerospace Sweden AB, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-3656-1806
University West, Sweden.
2020 (English)In: Materials Today Communications, ISSN 2352-4928, Vol. 24, article id 100958Article in journal (Refereed) Published
Abstract [en]

Production of superalloy gas turbine parts involves time consuming milling operations typically performed in a sequence from rough to finish milling. Rough milling using ceramic inserts allows high removal rates but causes severe sub-surface impact. A relatively large allowance is therefore left for subsequent cemented carbide milling. With increased knowledge of the affected depth it will be possible to reduce the machining allowance and increase efficiency of the manufacturing process. Milling Inconel 718 using typical production parameters has been investigated using new and worn ceramic and cemented carbide inserts. Residual stresses in a milled slot were measured by x-ray diffraction. Stresses were measured laterally across the slot and below the surface, to study the depth affected by milling. The most important result from this work is the development of a framework concerning how to evaluate the affected depth for a milling operation. The evaluation of a single milled slot shows great potential for determining the optimum allowance for machining. Our results show that the residual stresses are greatly affected by the ceramic and cemented carbide milling; both regarding depth as well as distribution across the milled slot. It has been shown that it is important to consider that the stresses across a milled slot are the highest in the center of the slot and gradually decrease toward the edges. Different inserts, ceramic and cemented carbide, and tool wear, alter how the stresses are distributed across the slot and the affected depth.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 24, article id 100958
Keywords [en]
Allowance determination, Alloy 718, High speed milling, Material removal rate, Residual stresses, Surface integrity, Carbide cutting tools, Carbide tools, Carbides, Milling (machining), Cutting tools
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43938DOI: 10.1016/j.mtcomm.2020.100958Scopus ID: 2-s2.0-85079036532OAI: oai:DiVA.org:ri-43938DiVA, id: diva2:1395717
Note

Funding details: VINNOVA; Funding text 1: The results presented in this paper are part of the research project SWE DEMO MOTOR [grant number 2015-06047 ] financed by VINNOVA , the Swedish government agency for Enterprise and Innovation . Special thanks are due to GKN Aerospace Sweden AB for supplying test materials, information and expertise and to Tooltec Trestad AB for help in manufacturing the test specimens. The authors would also like to acknowledge the Knowledge Foundation (KK Stiftelsen) and the SiCoMaP research school.

Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-03-05Bibliographically approved

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Holmberg, JonasBerglund, Johan

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