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Microstructure evolution and mechanical response-based shortening of thermal post-treatment for electron beam melting (EBM) produced Alloy 718
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0001-5676-7903
Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, Modena (ITA).
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)
Quintus Technologies AB, Västerås (SWE).
Vise andre og tillknytning
2021 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 820, artikkel-id 141515Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Electron beam melting (EBM) produced Alloy 718 was subjected to thermal post-treatment involving hot isostatic pressing (HIPing) and heat treatment (HT). Subjecting the material to HIPing at 1120 degrees C led to significant densification. Study of microstructure evolution during HT (comprising of solution treatment and aging) showed possibility of significantly shortening the HT duration, particularly the time for two-step aging from the standard (8 h + 8 h) long cycle to possibly a shortened (4 h + 1 h) cycle. Another approach for shortening the post-treatment cycle by integrating the HIPing with HT inside the HIP vessel was also successfully implemented. The above observations were further substantiated by tensile response of the material subjected to the varied post-treatment cycles; out of all the post-treatments steps, tensile behaviour was observed to be mainly affected by the aging treatment. Further prospects for shortening the post-treatment protocol are also described, such as shortening of HIPing duration for the typical 4 h to 1 h cycle as well as possible elimination of solution treatment step from the entire post-treatment protocol specifically when prior HIPing is performed. Heat treatment with prior HIPing was found to be crucial for improving fatigue life, because subjecting EBM Alloy 718 to only HT, irrespective of the short or standard long protocol, rendered inferior fatigue response.

sted, utgiver, år, opplag, sider
Elsevier, 2021. Vol. 820, artikkel-id 141515
Emneord [en]
Additive manufacturing; Electron beam melting; Alloy 718; Post-treatment; Microstructure evolution; Mechanical properties
HSV kategori
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URN: urn:nbn:se:hv:diva-17272DOI: 10.1016/j.msea.2021.141515ISI: 000668740700001Scopus ID: 2-s2.0-85107286492OAI: oai:DiVA.org:hv-17272DiVA, id: diva2:1609722
Forskningsfinansiär
Knowledge Foundation, 20160281Tilgjengelig fra: 2021-11-09 Laget: 2021-11-09 Sist oppdatert: 2022-04-04bibliografisk kontrollert

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