Constitutive Relationship and Critical Condition for Dynamic Recrystallization of Inconel 625 during Hot Deformation

Abstract:

Hot compression tests of the commercial Inconel 625 were performed in the temperature range of 950 - 1200 °C and strain rate range of 0.01 - 10 s-1. The constitutive relationship and the critical condition for dynamic recrystallization of Inconel 625 were established. The influence of strain on the flow stress was investigated by considering the effect of the strain on material constants. It was found that a five-order polynomial was suitable to represent the influence of the strain. The stress-strain curves obtained by the proposed constitutive equation showed a good agreement with experimental results. It can be used for the analysis problem of hot forming processes.The critical condition for dynamic recrystallization was obtained by using strain hardening rate. The critical strain increased with temperature decreasing and strain rate increasing. The critical condition for dynamic recrystallization can be expressed as .

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 1240-1244
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.1240
• Online since: June 2012
• Authors: Sheng Li Guo, De Fu Li, Zhi Gang Wu
• Keywords: Constitutive Relationship, Critical Strain, Dynamic Recrystallization (DRX), Inconel 625

References

[1] V.Shankar, K.Bhanu Sankara Rao and S.L. Mannan: J.Nucl.Mater vol. 288(2001), p.222

[2] G.P. Dinda, A.K. Dasgupta and  J.Mazumder: Mater. Sci. Eng. A vol.( 509) 2009, p.98

[3] A.Kumar, K.V. Rajkumar, T.Jayakumar, B.Raj and B.Mishra:J.Nucl.Mater vol. 350 (2006), p.284

[4] M.Aghaie-Khafri and N.Golarzi: Mater. Sci. Eng.A vol. 486 (2008), p.641

[5] S.C. Medeiros, Y.V.R.K. Prasad and W.G. Frazier: Mater. Sci. Eng.A vol. 293 (2000), p.198

[6] R.Ebrahimi and A.Najafizadeh: J.Mater.Process. Technol vol. 152 (2004), p.136

[7] L.Li, J. Zhou and J.Duszczyk:J.Mater.Process.Technol vol. 172 (2006), p.372

[8] H.Shi , A.J.McLaren, C.M. Sellars and R.Shahani : Mater. Sci. Eng.A vol. 13(1997) , p.210

[9] Y.C. Lin, M.S. Chen and J.Zhong: Comput. Mater. Sci. vol. 42(2008) , p.470

[10] E.I. Poliak and J.J. Jonas:Acta.Mater vol. 44(1999) , p.127

[11] E.I. Poliak and J.J. Jonas: ISIJ. Int vol. 43(2003) , p.684

[12] C.M. Sellars and J.A. Whiteman: Metal.Sci vol. 13(1979) , p.187