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


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:


[1] M.J.Donachie, S.J.Donachie: Superalloys – A Technical Guide, Second Edition. ASM International (2002). ISBN: 0-87170-749-7. Search in Google Scholar

[2] L.M.Suave, J.Cormier, P.Villechaise, A.Soula, Z.Hervier, D.Bertheau, J.Laigo: Metall. Mater. Trans. A45 (2014) 2963. 10.1007/s11661-014-2256-7 Search in Google Scholar

[3] S.J.Patel, G.D.Smith, in: International Symposium Niobium 2001, Orlando, Florida, USA, TMS (2001) 1081. Search in Google Scholar

[4] A.K.Koul, G.H.Gessinger: Acta Metall.31 (1983) 1061. 10.1016/0001-6160(83)90202-X Search in Google Scholar

[5] J.M.Larson, S.Floreen: Metall. Trans. A8 (1977) 51. 10.1007/BF02677263 Search in Google Scholar

[6] A.K.Koul, R.Thamburaj: Metall. Trans. A16 (1985) 17. 10.1007/BF02656707 Search in Google Scholar

[7] H. LoyerDanflou, M.Marty: Superalloys (1992) 63. 10.7449/1992/Superalloys_1992_63_72 Search in Google Scholar

[8] A.Wisniewski, J.Beddoes: Mater. Sci. Eng.A 510–511 (2009) 266. 10.1016/j.msea.2008.04.130 Search in Google Scholar

[9] H.U.Hong, I.S.Kim, B.G.Choi, M.Y.Kim, C.Y.Jo: Mater. Sci. Eng. A517 (2009) 125. 10.1016/j.msea.2009.03.071 Search in Google Scholar

[10] J.G.Yoon, H.W.Jeong, Y.S.Yoo, H.U.Hong: Mater. Charact.101 (2015) 49. 10.1016/j.matchar.2015.01.002 Search in Google Scholar

[11] J.W.Lee, D.J.Kim, H.U.Hong: Mater. Sci. Eng. A625 (2015) 164. 10.1016/j.msea.2014.12.010 Search in Google Scholar

[12] M.F.Henry, Y.S.Yoo, D.Y.Yoon, J.Choi: Metall. Trans. A24 (1993) 1733. 10.1007/BF02657848 Search in Google Scholar

[13] K.N.Tu, D.Turnbull: Acta Metall.15 (1967) 369. 10.1016/0001-6160(67)90241-3 Search in Google Scholar

[14] H.U.Hong, I.S.Kim, B.G.Choi, Y.S.Yoo, C.Y.Jo: Metall. Mater. Trans. A43 (2012) 173. 10.1007/s11661-011-0837-2 Search in Google Scholar

[15] H.U.Hong, H.W.Jeong, I.S.Kim, B.G.Choi, Y.S.Yoo, C.Y.Jo: Philos. Mag.92 (2012) 2809. 10.1080/14786435.2012.676212 Search in Google Scholar

[16] F.H.Latief, H.U.Hong, T.Blanc, I.S.Kim, B.G.Choi, C.Y.Jo, J.H.Lee: Mater. Chem. Physics148 (2014) 1194. 10.1016/j.matchemphys.2014.09.047 Search in Google Scholar

[17] M.Terner, H.U.Hong, J.H.Lee, B.G.Choi: Int. J. Mater. Res.107 (2016) 229. 10.3139/146.111332 Search in Google Scholar

[18] D.H.Ping, Y.F.Gu, C.Y.Cui, H.Harada: Mater. Sci. Eng. A456 (2007) 99. 10.1016/j.msea.2007.01.090 Search in Google Scholar

[19] A.C.Yeh, K.W.Lu, C.M.Kuo, H.Y.Bor, C.N.Wei: Mater. Sci. Eng. A530 (2011) 525. 10.1016/j.msea.2011.10.014 Search in Google Scholar

[20] E.J.Pickering, H.Mathur, A.Bohwmik, A.M.D.M.Messe, J.S.Barnard, M.C.Hardy, R.Krakow, K.Loehnert, H.J.Stone, C.M.F.Rae: Acta Mater.60 (2012) 2757. 10.1016/j.actamat.2012.01.042 Search in Google Scholar

[21] L.Viskari, Y.Cao, M.Norell, G.Sjoberg, K.Stiller: Mater. Sci. Eng. A528 (2011) 2570. 10.1016/j.msea.2010.11.080 Search in Google Scholar

[22] J.W.Lee, M.Terner, H.U.Hong, S.H.Na, J.B.Seol, J.H.Jang, T.H.Lee: Mater. Charact.135 (2018) 146. 10.1016/j.matchar.2017.11.047 Search in Google Scholar

[23] S.Floreen, G.E.Fuchs, W.J.Yang, in: E.A.Loria (Eds.), Superalloys 718, 625, 706 and Various Derivatives, TMS, Warrendale, PA (1994) 13. 10.7449/1994/Superalloys_1994_13_37 Search in Google Scholar

[24] B.B.Straumal, O.A.Kogtenkova, A.S.Gornkova, V.G.Sursaeva: J. Mater. Sci.51 (2016) 382. 10.1007/s10853-015-9341-1 Search in Google Scholar

[25] T.E.Hsieh, R.W.Balluffi: Acta Metall.37 (1989) 2133. 10.1016/0001-6160(89)90138-7 Search in Google Scholar

[26] S.B.Lee, W.Sigle, M.Ruhle: Acta Mater.51 (2003) 4583. 10.1016/s1359-6454(03)00295-7 Search in Google Scholar

[27] D.M.Kirch, B.Zhao, D.A.Molodov, G.Gottstein: Scr. Mater.56 (2007) 939. 10.1016/j.scriptamat.2007.02.010 Search in Google Scholar

[28] A.Donald: Philos. Mag.34 (1976) 1185. 10.1080/00318087608227739 Search in Google Scholar

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

© 2018, Carl Hanser Verlag, München