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Thermomechanical fatigue of additively manufactured 316L stainless steel
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SYSNO ASEP 0571964 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Thermomechanical fatigue of additively manufactured 316L stainless steel Tvůrce(i) Babinský, Tomáš (UFM-A) ORCID
Šulák, Ivo (UFM-A) ORCID
Kuběna, Ivo (UFM-A) RID, ORCID
Man, Jiří (UFM-A) RID, ORCID
Weiser, Adam (UFM-A) ORCID
Švábenská, Eva (UFM-A) ORCID
Englert, L. (DE)
Guth, S. (DE)Celkový počet autorů 8 Číslo článku 144831 Zdroj.dok. Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 869, MARCH (2023)Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova 316l ; Additive manufacturing ; Laser powder bed fusion ; Stainless steel ; Thermomechanical fatigue Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP EF18_053/0016933 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UFM-A - RVO:68081723 UT WOS 000991346000001 EID SCOPUS 85148684933 DOI 10.1016/j.msea.2023.144831 Anotace An important issue in energy conversion is the performance of materials under complex cyclic loading in a variable temperature field. The present study addresses a new field of research – thermomechanical fatigue of additively manufactured metallic materials, which is crucial for understanding the behaviour of this promising material class under real operating conditions. The material of interest – 316L austenitic stainless steel, commonly used for heat exchangers – was manufactured to bars using laser powder bed fusion. Cylindrical specimens with characteristic hierarchical, non-equilibrium cellular microstructure were machined out of the bars. Two orientations corresponding to the inclination of the building direction to the specimen axis were considered: 0° and 90°. The specimens were subjected to thermomechanical fatigue loading under in-phase (maximum tension coincides with maximum temperature) and out-of-phase (maximum compression coincides with maximum temperature) conditions. The cellular dislocation microstructure showed good stability despite gradual coarsening under the combined effect of thermal loading up to 750 °C and severe plastic deformation. Systematic electron microscopy observations further revealed that basic damage mechanisms – either creep or stress-assisted oxide cracking, the prevalence of which depends on thermomechanical loading conditions – correspond to the behaviour of conventional metallic materials. Under in-phase loading, intergranular creep damage is dominant, hence a key factor affecting the lifetime is the number of grain boundaries in the loading direction. Under out-of-phase loading, fatigue damage is dominant, and the lifetime is determined by transgranular propagation of a principal crack. Comparing the two orientations, the inherent microstructural texture was found to be a crucial factor, also determining the number of grain boundaries and cell walls in the loading direction. Hence, tailoring the microstructure for the service relevant loading conditions via additive manufacturing techniques enables to enhance the component performance in the important field of energy conversion. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2024 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0921509323002551?via%3Dihub
Počet záznamů: 1