Dynamic recrystallisation (DRX) behaviour in 904L superaustenitic stainless steel was studied by isothermal hot compression tests conducted in the temperature range of 900–1200°C and strain rate range of 0·001–10 s−1. The critical conditions for initiation of DRX are identified from the stress dependence of the derivative of strain hardening rate versus stress curves (dθ/dσ versus σ curves). The Z parameters combined with the temperature and strain rate effects during hot deformation are obtained by the regression analysis. Moreover, the kinetics model of DRX is established and the complete DRX grain size of 904L superaustenitic stainless steel is a power-law function of Z parameter with an exponent of –0·27.
MomeniA., DehghaniK., KeshmiriH. and EbrahimiG. R.:‘Hot deformation behavior and microstructural evolution of a superaustenitic stainless steel’, Mater. Sci. Eng. A, 2010, A527, (6), 1605–1611.
2.
SathiyaP., Kumar MishraM. and ShanmugarajanB.:‘Effect of shielding gases on microstructure and mechanical properties of super austenitic stainless steel by hybrid welding’, Mater. Des., 2012, 33, 203–212.
3.
LewisA. C., BingertJ. F., RowenhorstD. J., GuptaA., GeltmacherA. B. and SpanosG.:‘Two- and three-dimensional microstructural characterization of a super-austenitic stainless steel’, Mater. Sci. Eng. A, 2006, A418, (1–2), 11–18.
4.
KimS.-T., KimS.-Y., LeeI.-S., ParkY.-S., ShinM.-C. and KimY.-S.:‘Effects of shielding gases on the microstructure and localized corrosion of tube-to-tube sheet welds of super austenitic stainless steel for seawater cooled condenser’, Corros. Sci., 2011, 53, (8), 2611–2618.
5.
MirzadehH. and NajafizadehA.:‘Flow stress predi tion at hot working conditions’, Mater. Sci. Eng. A, 2010, A527, (4–5), 1160–1164.
6.
MirzadehH., CabreraJ. M., PradoJ. M. and NajafizadehA.:‘Hot deformation behavior of a medium carbon microalloyed steel’, Mater. Sci. Eng. A, 2011, A528, (10–11), 3876–3882.
7.
ShabanM. and EghbaliB.:‘Determination of critical conditions for dynamic recrystallization of a microalloyed steel’, Mater. Sci. Eng. A, 2010, A527, (16–17), 4320–4325.
8.
MirzadehH. and NajafizadehA.:‘Prediction of the critical conditions for initiation of dynamic recrystallization’, Mater. Des., 2010, 31, (3), 1174–1179.
9.
EbrahimiG. R., KeshmiriH., MomeniA. and MazinaniM.:‘Dynamic recrystallization behavior of a superaustenitic stainless steel containing 16Cr and 25Ni’, Mater. Sci. Eng. A, 2011, A528, (25–26), 7488–7493.
10.
DingR. and GuoZ. X.:‘Coupled quantitative simulation of microstructural evolution and plastic flow during dynamic recrystallization’, Acta Mater., 2001, 49, (16), 3163–3175.
11.
HanY., QiaoG. J., SunJ. P. and ZouD. N.:‘A comparative study on constitutive relationship of as-cast 904L austenitic stainless steel during hot deformation based on Arrhenius-type and artificial neural network models’, Comput. Mater. Sci., 2013, 67, 93–103.
12.
QuelennecX., BozzoloN., JonasJ. J. and LogeR.:‘A New Approach to Modeling the Flow Curve of Hot Deformed Austenite’, ISIJ Int., 2011, 51, (6), 945–950.
13.
ChenF., CuiZ. and ChenS.:‘Recrystallization of 30Cr2Ni4MoV ultra-super-critical rotor steel during hot deformation. Part I: Dynamic recrystallization’, Mater. Sci. Eng. A, 2011, A528, (15), 5073–5080.
14.
JonasJ. J., QuelennecX., JiangL. and MartinE.:‘The Avrami kinetics of dynamic recrystallization’, Acta Mater., 2009, 57, (9), 2748–2756.
15.
MatayaM. C., NilssonE. R., BrownE. L. and KraussG.:‘Hot working and recrystallization of As-Cast 316L’, Metall. Mater. Trans. A, 2003, 34A, (8), 1683–1703.
16.
McQueenH. J. and RyanN. D.:‘Constitutive analysis in hot working’, Mater. Sci. Eng. A, 2002, A322, (1–2), 43–63.
17.
BelyakovA., MiuraH. and SakaiT.:‘Dynamic recrystallization under warm deformation of a 304 type austenitic stainless steel’, Mater. Sci. Eng. A, 1998, A255, (1–2), 139–147.
18.
PoliakE. I. and JonasJ. J.:‘Initiation of dynamic recrystallization in constant strain rate hot deformation’, ISIJ Int., 2003, 43, (5), 684–691.
19.
Dehghan-ManshadiA., BarnettM. R. and HodgsonP. D.:‘Recrystallization in AISI 304 austenitic stainless steel during and after hot deformation’, Mater. Sci. Eng. A, 2008, A485, (1–2), 664–672.
20.
KimS. I. and YooY. C.:‘Dynamic recrystallization behavior of AISI 304 stainless steel’, Mater. Sci. Eng. A, 2001, A311, 108–113.
21.
LiuJ., CuiZ. and RuanL.:‘A new kinetics model of dynamic recrystallization for magnesium alloy AZ31B’, Mater. Sci. Eng. A, 2011, A529, 300–310.
22.
KongL. X., HodgsonP. D. and WangB.:‘Development of constitutive models for metal forming with cyclic strain softening’, J. Mater. Process. Technol., 1999, 89–90, 44–50.
