Effect of solution heat treatments on superalloys Part 1 - alloy 718
Artikel i vetenskaplig tidskrift, 2012

The hot ductility as measured by Gleeble testing of Alloy 718 at four different solution heat treatments (954 degrees C/15 h, 954 degrees C/1 h, 982 degrees C/1 h and 1050 degrees C/3 h+954 degrees C/1 h) has been investigated. It is concluded that constitutional liquation of NbC assisted by delta 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 delta 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.

Gleeble testing

Alloy 718

cracking

sulfur

elements

Hot ductility

alloy

Weldability

nickel

affected zone

inconel-718

Författare

Joel Håkan Andersson

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Göran Sjöberg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Leif Viskari

Chalmers, Teknisk fysik, Materialens mikrostruktur

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Mahesh Chaturvedi

University of Manitoba

Materials Science and Technology

0267-0836 (ISSN)

Vol. 28 5 609-619

Styrkeområden

Transport

Produktion

Materialvetenskap

Ämneskategorier

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1179/1743284711y.0000000101