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Precipitates formation and its impact in friction stir welded and post-heat-treated Inconel 718 alloy

Published online by Cambridge University Press:  23 August 2011

Kuk Hyun Song ,
Han Sol Kim  and
Won Yong Kim
Kuk Hyun Song
Affiliation:
Korea Institute of Industrial Technology, 7-47, Songdo-Dong, Yeonsu-gu, Incheon, 406-840, Korea
Han Sol Kim
Affiliation:
Korea Institute of Industrial Technology, 7-47, Songdo-Dong, Yeonsu-gu, Incheon, 406-840, Korea
Won Yong Kim
Affiliation:
Korea Institute of Industrial Technology, 7-47, Songdo-Dong, Yeonsu-gu, Incheon, 406-840, Korea
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Abstract

In order to investigate the formation of precipitates such as MC carbides and intermetallic compounds in the friction stir welded and post-heat-treated Inconel 718 alloy, this work was carried out. Furthermore, the microstructural and mechanical properties of welds and post-heat-treated material were evaluated to identify the effect on precipitates formed during post-heat-treatment. Friction stir welding (FSW) was performed at a rotation speed of 200 rpm and welding speed of 150 mm/min; heat treatment was performed after welding at 720 °C for 8 hours in vacuum. As a result, the grain size due to FSW was notably refined from 5–20 μm in the base material to 1–3 μm in the stir zone; this was accompanied by dynamic recrystallization, which resulted in enhancements in the mechanical properties as compared to the base material. In particular, applying heat treatment after FSW led to improvements in the mechanical properties of the welds—the microhardness and tensile strength increased by more than 50% and 40% in fraction, respectively, as compared to FSW alone.

Keywords

joiningmicrostructuregrain size
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1363: Symposium RR – Fundamental Science of Defects and Microstructure in Advanced Materials for Energy , 2011 , mrss11-1363-rr05-17
Copyright
Copyright © Materials Research Society 2011

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