Investigation of the Effect of Short Exposure in the Temperature Range of 750-950 degrees C on the Ductility of Haynes (R) 282 (R) by Advanced Microstructural Characterization
Artikel i vetenskaplig tidskrift, 2019

A Gleeble-based test method has been developed to study the change in the ductility signature of Haynes (R) 282 (R) during isothermal exposure from 5 s to 1800 s. A temperature range of 750 to 950 degrees C has been used to investigate the effect of age-hardening reactions. Microstructural constituents have been analyzed and quantified using scanning and transmission electron microscopy. Carbides present in the material are identified as primary MC-type TiC carbides, Mo-rich M6C secondary carbides, and Cr-rich M23C6 secondary carbides. Gamma prime (gamma') precipitates are present in all the material conditions with particle sizes ranging from 2.5 nm to 58 nm. Isothermal exposure causes the growth of gamma' and development of a grain boundary carbide network. A ductility minimum is observed at 800-850 degrees C. The fracture mode is found to be dependent on the stroke rate, where a transition toward intergranular fracture is observed for stroke rates below 0.055 mm/s. Intergranular fracture is characterized by microvoids present on grain facets, while ductility did not change during ongoing age-hardening reactions for intergranularly fractured Haynes (R) 282 (R).

strain-age cracking

haynes 282

nickel-based superalloy

Författare

Fabian Hanning

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Abdul Khaliq Khan

University of Manitoba

Joachim Steffenburg-Nordenstroem

GKN Aerospace Sweden

Olanrewaju Ojo

University of Manitoba

Joel Håkan Andersson

Högskolan Väst

Metals

2075-4701 (eISSN)

Vol. 9 12 1357

Ämneskategorier

Materialkemi

Geokemi

Metallurgi och metalliska material

DOI

10.3390/met9121357

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Senast uppdaterat

2020-01-28