Micromechanical model for fatigue limit of metal AM parts and materials

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Fatigue remains a challenge especially for high end metal AM parts and materials. From a design perspective, the fatigue limit of an AM solution can be improved upon by optimizing the manufacturing process for a certain material and part. In addition, improved accuracy of design methodologies aids in capturing the features critical for fatigue and quantifies their significance to desired part lifetime as well as providing a basis for their avoidance. In current work we present an overall concept merging thermomechanical process and powder bed solidification modeling to micromechanical analysis of fatigue of the resulting material microstructure. Material features critical to fatigue, particularly surface roughness, internal defects such as porosity and cracks and on the other hand inclusions, can be assessed directly on the basis of AM part microstructure with respect to the resulting fatigue limit. Case analyses consist of maraging steel and nickel alloys. The overall scheme provides a basis for optimization of metal AM solutions against fatigue and multiscale modeling founded basis for fatigue design.

    Original languageEnglish
    Title of host publicationEuro PM 2018 Congress and Exhibition
    PublisherEuropean Power Metallurgy Association EPMA
    ISBN (Electronic)978-1-8990-7250-7
    Publication statusPublished - 2018
    MoE publication typeA4 Article in a conference publication
    EventEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2018 - Bilbao, Spain
    Duration: 14 Oct 201818 Oct 2018

    Conference

    ConferenceEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2018
    CountrySpain
    CityBilbao
    Period14/10/1818/10/18

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    Cite this

    Laukkanen, A., Andersson, T., Lindroos, M., & Pinomaa, T. (2018). Micromechanical model for fatigue limit of metal AM parts and materials. In Euro PM 2018 Congress and Exhibition European Power Metallurgy Association EPMA.