Accessible Requires Authentication Published by De Gruyter August 30, 2018

First evidence of grain boundary serration in a specifically heat treated wrought Alloy 625 Ni-based superalloy

Mathieu Terner, Ji-Won Lee, Jin-Hyeok Kim and Hyun-Uk Hong

Abstract

Grain boundary serration is an effective way to increase the high temperature resistance of superalloys and steels. The popular Alloy 625 Ni-based superalloy was until now believed not to form serrated grain boundaries based on previous considerations of serrability criteria. Following the recent strain-induced serration mechanism, a special heat treatment involving continuous slow cooling between the solution and aging temperature was designed. As a result, significant serration was observed for the first time for Alloy 625 promoted by slow cooling. Grain boundary M23C6 carbides were systematically detected from either degenerescence of solidification MC carbides or heterogeneous nucleation. Upon aging, serration amplitude increased and precipitation of the δ phase proliferated.


*Correspondence address, Prof. Hyun-Uk Hong, Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongnam 51140, Republic of Korea, Tel.: +82-55-213-3699, Fax: +82-55-261-7017, E-mail:

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Received: 2018-02-19
Accepted: 2018-04-04
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München