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• W3048244598 abstract "Modern high-strength steels (HSS), microalloyed and produced via controlled thermomechanical processing, find their superior mechanical properties compromised by the high peak temperatures and cooling rates of fusion welding. This work demonstrates, for a particular modern HSS, that friction stir welding (FSW) can join HSS via thermomechanical processing at peak temperatures below A1 ≈ 727 oC , minimizing detrimental microstructural degradation and resulting in joint properties that can match, or even surpass, those of the base material. The microstructure and the mechanical properties of sound FSW joints, depend on the relationship between the peak temperature and the intercritical temperature range [A1, A3] of the HSS. Thus, proper control of peak temperatures and cooling rates in the stirred material is required to ensure process stability, repeatability and so that the microstructure and mechanical properties of welded joints can be tailored by FSW. There are currently no known methods for direct measurements of non-uniform and transient temperature fields inside solid materials, such as steel plates. This thesis was developed on the scope of the implementation of a new online control strategy for FSW of ferromagnetic low-alloy steels based on the relationship between the magnetic transformation of steel, at the Curie temperature TCurie ≈ 740 oC , and the [A1, A3] range. The monitoring concept, supporting the control strategy, should be applicable to other ferromagnetic steels but not to austenitic-based steels. The study includes comprehensive mechanical testing supported by microstructural analysis. The real critical temperatures TCurie, AC1 and AC3 were measured via DSC. Contactless magnetic-based monitoring systems, using eddy currents and Hall-effect sensors, were developed and tested on thermal and thermomechanical processing cycles. The magnetic-based monitoring accurately detects the TCurie inside the processed volume and, above TCurie, the signal is sensitive to temperature gradients inherent to the volume change of paramagnetic material. The application of this magnetic-based monitoring can be extended to other thermal or thermomechanical solid-state domain processing of steel to produce raw material and components.; Nykyaikaisilla mikroseosteisilla ja termomekaanisesti valssattuilla suurlujuusteraksilla (HSS, high-strength steels) on erinomaiset mekaaniset ominaisuudet. Niihin voi kuitenkin vaikuttaa heikentavasti huippulampotilat ja jaahtymisnopeudet sulahitsausprosesseissa. Tassa tyossa esitetaan, miten kitkatappihitsauksen (FSW, friction stir welding) avulla voidaan suurlujuusterasta liittaa termomekaanisesti prosessoimalla huippulampotilan pysyessa alle teraksen A1-lampotilan (≈ 727 oC) siten, etta mikrorakenteelliset muutokset pysyvat pienina ja hitsausliitoksen ominaisuudet pysyvat perusainetta vastaavina, tai ne voivat olla jopa paremmat. FSW-hitsatun liitoksen mikrorakenne ja mekaaniset ominaisuudet riippuvat prosessin huippulampotilan ja HSS-teraksen kriittisen lampotilavalin [A1, A3]…" @default.
• W3048244598 created "2020-08-13" @default.
• W3048244598 creator A5036732590 @default.
• W3048244598 date "2020-01-01" @default.
• W3048244598 modified "2023-09-27" @default.
• W3048244598 title "Friction stir welding of modern high-strength steels: Joint characterization and development of a magnetic-based process monitoring" @default.
• W3048244598 hasPublicationYear "2020" @default.
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