Distinct regions such as weld metal, heat-affected zone (HAZ) and base metal of P9 steel weld joints fabricated by various welding processes were investigated using impression creep testing. Smaller prior austenitic grain size, lower density of precipitates and dislocations resulted in faster recovery and higher creep rate of HAZ in comparison to the weld and base metal. Compared to base metal, shielded metal arc weld (SMAW) and activated tungsten inert gas (A-TIG) weld of the P9 steel weld joints exhibited better resistance to creep and displayed higher activation energy due to their coarser prior austenite grain size. A-TIG HAZ exhibited superior creep properties compared to the SMAW and TIG HAZ due to the presence of higher number density of precipitates.
MilovićLJ, VuhererT, BlačićI, Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures. Mater Des. 2013;46:660–667. doi: 10.1016/j.matdes.2012.10.057
4.
MilovićL, VuhererT, ZrilićM, Study of the simulated heat affected zone of creep resistant 9–12% advanced chromium steel. Mater Manuf Processes. 2008;23(6):597–602. doi: 10.1080/10426910802160544
5.
ZrilićM, RakinM, MilovićL, Experimental and numerical evaluation of a steamline behaviour using local approach. Metallurgia. 2007;46(2):87–92.
VanstoneR.Advanced 700 °C pulverized fuel power plant. In: Strang A, Banks WM, Conroy RD, et al., Editors. Proceedings of the 5th International Charles Parsons Turbine Conference: Parsons Advanced Materials for 21st Century Turbine and Power Plants; London: IOM Communications Limited; 2000. p. 91–97.
8.
CunninghamGW, PatriarcaP, HoffmanEE.Ferritic steels as alternate structural materials for high-temperature applications. In: Proceedings of International Conference. Ferritic steels for high temperature application; Ohio: ASM Metals Park; 1983. p. 3–6.
9.
YadavSD, El-TahawyM, KalácskaS, Characterizing dislocation configurations and their evolution during creep of a new 12%Cr. Mater Charact. 2017;134:387–397. doi: 10.1016/j.matchar.2017.11.017
10.
YadavSD, SchererT, JäntschU, Investigation of creep cavities formation in a 12Cr0.36Ta steel employing 3D-EBSD. Mater Lett. 2017;207:76–79. doi: 10.1016/j.matlet.2017.07.039
11.
YadavSD, SondereggerB, StraceyM, Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach. Mater Sci Eng. A. 2016;662:330–341. doi: 10.1016/j.msea.2016.03.071
12.
YadavSD, KalácskaS, DománkováM, Evolution of the substructure of a novel 12% Cr steel under creep conditions. Mater Charact. 2016;115:23–31. doi: 10.1016/j.matchar.2016.03.015
13.
YadavSD, SondereggerB, SartoryB, Characterisation and quantification of cavities in 9Cr martensitic steel for power plants. Mater Sci Technol. 2015;31(5):554–564. doi: 10.1179/1743284714Y.0000000635
14.
YadavSD, RoscJ, SartoryB, Investigation of pre-existing pores in creep loaded 9Cr steel. In: Proceedings of Conference. 2nd International Congress on ‘3D Materials science’; Annecy, France: TMS (The Minerals, Metals & Materials Society); 2014. p. 85–90. https://doi.org/10.1002/9781118990278.ch14.
15.
VasudevanM.Computational and experimental studies on arc welded austenitic stainless steels [PhD Thesis]. Chennai: Indian Institute of Technology, Chennai; 2007.
16.
MaduraimuthuV, VasudevanM, MuthupondiV, Study of the effect of activated flux on the microstructure and mechanical properties of mod. 9Cr–1Mo Steel. Metall Trans. B. 2012;43(1):123–132. doi: 10.1007/s11663-011-9568-4
17.
TanakaM, ShimizuT, TerasakiH, Effects of activating flux on arc phenomena in gas tungsten welding. Sci Technol Weld Join. 2000;5(6):397–402. doi: 10.1179/136217100101538461
18.
HowseDS, LucasW.Investigation into arc constriction by active fluxes for tungsten inert gas welding. Sci Technol Weld Join. 2000;5(3):89–193. doi: 10.1179/136217100101538191
19.
HuangHY, ShyuSW, TsengKH, Evaluation of TIG-flux welding on the characteristics of stainless steel. Sci Technol Weld Join. 2005;10(5):566–573. doi: 10.1179/174329305X48329
20.
LowkeJJ, TanakaM, UshioM.Mechanisms giving increased weld depth due to a flux. J Phys D Appl Phys. 2005;38:3438–3445. doi: 10.1088/0022-3727/38/18/018
21.
TsengKH, HsuCY.Performance of activated TIG process in austenitic stainless steel welds. J Mater Process Tech. 2011;211:503–512. doi: 10.1016/j.jmatprotec.2010.11.003
LeconteS, PaillardP, SaindrenanJ.Effect of fluxes containing oxides on tungsten inert gas welding process. Sci Technol Weld Join. 2006;11(1):43–47. doi: 10.1179/174329306X77047
24.
ModenesiPJ, ApolinarioER, PereiraIM.TIG welding with single component fluxes. J Mater Process Tech. 2000;99(1–3):260–265. doi: 10.1016/S0924-0136(99)00435-5
25.
ArunkumarV, VasudevanM, MaduraimuthuV, Effect of activated flux on the microstructure and mechanical properties of plain 9Cr–1Mo steel weld joint. Mater Manuf Processes. 2012;27(11):1–7. doi: 10.1080/10426914.2011.610212
26.
MulhearnTO, TaborD.Creep and hardness of metals: a physical study. J Inst Metals. 1960;89:7–12.
27.
SherbyOD, ArmstrongPE.Prediction of activation energies for creep and self diffusion from hot hardness data. Metall Mater Trans. B. 1971;2(12):3479–3484. doi: 10.1007/BF02811630
28.
SargentPM, AshbyMF.Indentation creep. Mater Sci Technol. 1992;8(7):594–601. doi: 10.1179/mst.1992.8.7.594
29.
MerchantHD, MurtyGS, BahadurSN, Hardness temperature relationship in metals. J Mater Sci. 1973;8(3):437–442. doi: 10.1007/BF00550166
30.
HooperRM, BrookesCA.Incubation periods and indentation creep in lead. J Mater Sci. 1984;19(12):4057–4060. doi: 10.1007/BF00980771
31.
CsehG, ChinhNQ, TasnadiP, Indentation test for the investigation of high temperature plasticity of materials. J Mater Sci. 1997;32(19):5107–5111. doi: 10.1023/A:1018665300227
32.
CsehG, ChinhNQ, JuhaszA.Indentation curves and viscosity measurements on glasses. J Mater Sci Lett. 1998;17:1207–1209. doi: 10.1023/A:1006593727372
33.
FujiwaraM, OtsukaM.Indentation creep of β-Sn and Sn-Pb eutectic alloy. Mater Sci Eng. A. 2001;319–321:929–933. doi: 10.1016/S0921-5093(01)01079-6
34.
ViswanathanUK, KuttyTRG, KeswaniR, Evaluation of hot hardness and creep of a 350 grade commercial maraging steel. J Mater Sci. 1996;31(10):2705–2709. doi: 10.1007/BF00687304
35.
LucasBN, OliverWC.Indentation power law creep of high purity indium. Metall Mater Trans. A. 1999;30A:601–611. doi: 10.1007/s11661-999-0051-7
36.
ChuSNG, LiJCM.Impression creep: a new creep test. J Mater Sci. 1977;12(11):2200–2208. doi: 10.1007/BF00552241
KozeschnikE, SvobodaJ, FratzlP, Modelling of kinetics in multi-component multi-phase systems with spherical precipitates: II. Numerical solution and application. Mater Sci Eng. A. 2004;385:157–165.
39.
YuEC, LiJCM.Impression creep of LiF single crystals. Philos Mag. 1977;36(4):811–825. doi: 10.1080/14786437708239760
40.
TollmienW, SchlichtingH, GörtlerH, Über die Eindringungsfestigkeit (Harte) plastischer Baustoffe und die Festigkeit von Schneiden. Z Angew Math Mech. 1921;1:15–20. https://doi.org/10.1007/978-3-662-11836-8_8. doi: 10.1002/zamm.19210010102
41.
TaborD.A simple theory of static and dynamic hardness. Proc R Soc Lond. A. 1948;192:247–274. doi: 10.1098/rspa.1948.0008
42.
AtkinsAG, TaborD.Plastic indentation in metals with cones. J Mech Phys Solids. 1965;13:149–164. doi: 10.1016/0022-5096(65)90018-9
ChuSNG, LiJCM.Impression creep of β-tin single crystals. J Mater Sci Eng. 1979;39(1):1–10. doi: 10.1016/0025-5416(79)90164-2
45.
YuHY, LiJCM.Computer simulation of impression creep by the finite element method. J Mater Sci. 1977;12(11):2214–2222. doi: 10.1007/BF00552243
46.
LiJCM.Impression creep and other localized tests. Mater Sci Eng. A. 2002;322(1-2):23–42. doi: 10.1016/S0921-5093(01)01116-9
47.
HydeTH, YehiaKA, BeckerAA.Interpretation of impression creep data using a reference stress approach. Int J Mech Sci. 1993;35(6):451–462. doi: 10.1016/0020-7403(93)90035-S
48.
ChiangD, LiJCM.Impression creep of lead. J Mater Res. 1994;9(4):903–908. doi: 10.1557/JMR.1994.0903
49.
DornerD, RollerK, SkrotzkiB, Creep of a TiAl alloy: a comparison of indentation and tensile testing. Mater Sci Eng. A. 2003;357(1–2):346–354. doi: 10.1016/S0921-5093(03)00205-3
50.
PengL, YangF, NieJF, Impression creep of a Mg–8Zn–4Al–0.5Ca- alloy. Mater Sci Eng. A. 2005: 410-411:42–47. doi: 10.1016/j.msea.2005.08.031
51.
GondavartiPS, MurtyKL.Creep anisotropy of zinc using impression testing. J Mater Sci Lett. 1987;6:456–458. doi: 10.1007/BF01756797
52.
NayyeriG, MahmudiR.The microstructure and impression creep behaviour of cast Mg–5Sn–xCa alloys. Mater Sci Eng. A. 2010;527(7–8):2087–2098. doi: 10.1016/j.msea.2009.11.053
53.
OwenDM, LangdonTG.Low stress creep behavior: an examination of Nabarro–Herring and Harper–Dorn creep. Mater Sci Eng. A. 1996;216:20–29. doi: 10.1016/0921-5093(96)10382-8
54.
ChoudharyBK.Influence of strain rate and temperature on serrated flow in 9Cr–1Mo ferritic steel. Mater Sci Eng. A. 2013;564:303–309. doi: 10.1016/j.msea.2012.11.104
55.
NagarajuS, VasantharajaP, BrahadeesG, Effect of welding processes on the microstructure, mechanical properties and residual stresses of plain 9Cr–1Mo steel weld joints. J Mater Eng Perform. 2017;26:5938–5953. doi: 10.1007/s11665-017-3077-9
56.
VijayanandVD, YadavSD, ParameswaranP, On characterizing composite microstructure in 316LN stainless steel weld metal and a new damage micro-mechanism during creep. Metall Mater Trans. A. 2018;49:4409–4412. doi: 10.1007/s11661-018-4805-y
57.
GhoniemN, MatthewsJ, AmodeoR.A dislocation model for creep in engineering materials. Res. Mech. 1990;29:197–219.
XuYW, SongSH, WangJW.Effect of rare earth cerium on the creep properties of modified 9Cr–1Mo heat resistant steel. Mater Lett. 2015;161:616–619. doi: 10.1016/j.matlet.2015.09.051
