The microstructures of a Ni-based superalloy used in the advanced ultra-supercritical condition were investigated after creep deformation. The grain boundary migrated during tertiary creep. Accompanied by the migration of grain boundaries, the coarsened γ′ phase with rodlike shape was formed and the precipitate-free zones emerged around this coarsened γ′. The distributional misorientation angle of these grain boundaries was from 45° to 65°. After the examination of the distribution characteristics of the cracks, it was found that the intergranular cracks did not propagate through the precipitate-free zones with the coarsened γ′.
LeeT-H, SuhH-Y, HanS-K, Effect of a heat treatment on the precipitation behavior and tensile properties of alloy 690 steam generator tubes. J Nucl Mater. 2016;479:85–92. doi: 10.1016/j.jnucmat.2016.06.038
2.
JinlongL, TongxiangL, ChenW, Comparison of corrosion behavior between coarse grained and nano/ultrafine grained alloy 690. Appl Surf Sci. 2016;360:403–408. doi: 10.1016/j.apsusc.2015.11.031
3.
YinH, GaoY, GuY.Evolution of the microstructure and microhardness of the welding joint of IN 740H alloy with IN 617 as filler metal. Mater Charact. 2017;127:288–295. doi: 10.1016/j.matchar.2017.01.011
4.
DangYY, ZhaoXB, YuanY, Predicting long-term creep-rupture property of Inconel 740 and 740H. Mater High Temp. 2016;33:1–5. doi:10.1179/1878641315Y.0000000010.
5.
JiangH, DongJX, ZhangMC.Manufacture process design of Inconel 617B superheater tubes for ultra-supercritical power plants. Mater Res Innov. 2015;18:S4–S369.
6.
SimsCT, StoloffNS, HagelWC.Superalloys II. New York: Materialsence; 1987.
7.
LinYC, LiL, HeD-G, Effects of pre-treatments on mechanical properties and fracture mechanism of a nickel-based superalloy. Mater Sci Eng A. 2017;679:401–409. doi: 10.1016/j.msea.2016.10.058
8.
RahimiS, KingM, DumontC.Stress relaxation behaviour in IN718 nickel based superalloy during ageing heat treatments. Mater Sci Eng A. 2017;708:563–573. doi: 10.1016/j.msea.2017.09.116
9.
HeLZ, ZhengQ, SunXF, Effect of carbides on the creep properties of a Ni-base superalloy M963. Mater Sci Eng A. 2005;397:297–304. doi: 10.1016/j.msea.2005.02.038
10.
LiPE, ZhangJS, WangFG, Influence of intergranular carbide density and grain size on creep of Fe-15Cr-25Ni alloys. Metall Trans A. 1992;23:1379–1381. doi: 10.1007/BF02665071
11.
TytkoD, ChoiP, KlöwerJ, Microstructural evolution of a Ni-based superalloy (617B) at 700°C studied by electron microscopy and atom probe tomography. Acta Mater. 2012;60:1731–1740. doi: 10.1016/j.actamat.2011.11.020
12.
YanC, ZhengdongL, GodfreyA, Microstructure evolution and mechanical properties of Inconel 740H during aging at 750°C. Mater Sci Eng A. 2014;589:153–164. doi: 10.1016/j.msea.2013.09.076
13.
WadsworthJ, RuanoOA, SherbyOD.Denuded zones, diffusional creep, and grain boundary sliding. Metall Mater Trans A. 2002;33:219–229. doi: 10.1007/s11661-002-0084-7
14.
HansenN, JuulJ, LiuY, Microstructural and crystallographic aspects of recrystallization. Roskilde: Risoe National Lab; 1995.
15.
VandermeerRA, Juul JensenD.The migration of high angle grain boundaries during recrystallization. Interface Sci. 1998;6:95–104. doi: 10.1023/A:1008668604733
16.
Juul JensenD.Growth rates and misorientation relationships between growing nuclei/grains and the surrounding deformed matrix during recrystallization. Acta Metall. 1995;43:4117–4129. doi: 10.1016/0956-7151(95)00111-8
17.
HumphreysFJ, HatherlyM.Recrystallization and related annealing phenomena. 2nd ed. Amsterdam: Elsevier; 2004.
18.
BeckPA, SperryPR, HuH.The orientation dependence of the rate of grain boundary migration. J Appl Phys. 1950;21:420–425. doi: 10.1063/1.1699676
19.
KronbergML, WilsonFH.Secondary recrystallization in copper. Trans Met Soc AIME. 1949;185:501–514.
20.
KumarM, SchwartzAJ, KingWE.Microstructural evolution during grain boundary engineering of low to medium stacking fault energy fcc materials. Acta Mater. 2002;50:2599–2612. doi: 10.1016/S1359-6454(02)00090-3
21.
LinYC, WuX-Y, ChenX-M, EBSD study of a hot deformed nickel-based superalloy. J Alloys Compd. 2015;640:101–113. doi: 10.1016/j.jallcom.2015.04.008
22.
YogoY, TakeuchiH, IshikawaT, Strain-induced boundary migration of carbon steel at high temperatures. Scripta Mater. 2009;61:1001–1003. doi: 10.1016/j.scriptamat.2009.08.003
23.
LiuT, XiaS, LiH, The highly twinned grain boundary network formation during grain boundary engineering. Mater Lett. 2014;133:97–100. doi: 10.1016/j.matlet.2014.06.166
24.
KipfstuhlS, FariaSH, AzumaN, Evidence of dynamic recrystallization in polar firn. J Geophys Res: Solid Earth. 2009;114(B5). doi: 10.1029/2008JB005583
