Effect of solution heat treatments on superalloys: Part 1 – alloy 718
2012 (English)In: Materials Science and Technology, ISSN 0267-0836, Vol. 28, no 5, 609-619 p.Article in journal (Refereed) Published
The hot ductility as measured by Gleeble testing of Alloy 718 at four different solution heat treatments (954°C/15 h, 954°C/1 h, 982°C/1 h and 1050°C/3 h+954°C/1 h) has been investigated. It is concluded that constitutional liquation of NbC assisted by δ phase takes place and deteriorates the ductility. Parameters established by analysing the ductility dependence on temperature indicate a reduced weldability of the material in the coarse grain size state (ASTM 3) while indicating an increased weldability when containing a large amount of δ phase due to a grain boundary pinning effect. The accumulation of trace elements during grain growth at the highest temperature is believed to be the cause for the observed reduced on-cooling ductility.
Place, publisher, year, edition, pages
Taylor & Francis Group, 2012. Vol. 28, no 5, 609-619 p.
Hot ductility, Gleeble test, Alloy 718
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject Production Technology; ENGINEERING, Manufacturing and materials engineering
IdentifiersURN: urn:nbn:se:hv:diva-9007DOI: 10.1179/1743284711Y.0000000101OAI: oai:DiVA.org:hv-9007DiVA: diva2:900803