Modeling dynamic recrystallization of L-605 cobalt superalloy

Abstract The evolution of the microstructure of L-605 cobalt superalloy during high-temperature deformation is investigated using mean-field models combined with a reverse-engineering method. This method provides the unknown material parameters such as mobility and nucleation frequency, and it helps to quantify the occurrence of recrystallization. The effect of alloying elements on the mobility is quantified by comparison with the pure metal. Despite the large concentration of elements, the solute-drag effect can still be properly described by the Cahn model. A comparison with experimental results sheds new light on the occurrence of joint mechanisms that are usually neglected, such as self-heating and meta-dynamic recrystallization. The inclusion of these phenomena is not significantly more complicated when compared to the basic model, but it significantly improves the predictability for large strain rate.

[1]  Y. Bréchet,et al.  The effect of solute on discontinuous dynamic recrystallization , 2012 .

[2]  Swarup Bag,et al.  A two-site mean field model of discontinuous dynamic recrystallization , 2011 .

[3]  F. Montheillet,et al.  Influence of niobium solutes on the mechanical behavior of nickel during hot working , 2013 .

[4]  U. F. Kocks,et al.  Physics and phenomenology of strain hardening: the FCC case , 2003 .

[5]  J. Jonas,et al.  Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions , 2014 .

[6]  R. Logé,et al.  A mean field model of dynamic and post-dynamic recrystallization predicting kinetics, grain size and flow stress , 2015 .

[7]  D. Fabrègue,et al.  Deformation Behavior and Dynamic Recrystallization of Biomedical Co-Cr-W-Ni (L-605) Alloy , 2013, Metallurgical and Materials Transactions A.

[8]  Brian Derby,et al.  The dependence of grain size on stress during dynamic recrystallisation , 1991 .

[9]  J. E. Bailey,et al.  The recrystallization process in some polycrystalline metals , 1962, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[10]  D. Fabrègue,et al.  Grain growth and static recrystallization kinetics in Co–20Cr–15W–10Ni (L-605) cobalt-base superalloy , 2014 .

[11]  J. Jonas,et al.  Softening and microstructural change following the dynamic recrystallization of austenite , 1994 .

[12]  E. B. Hawbolt,et al.  Comparison between Static and Metadynamic Recrystallization-An Application to the Hot Rolling of Steels , 1997 .

[13]  C. Sinclair,et al.  The Effect of Nb on the Recrystallization and Grain Growth of Ultra-High-Purity α-Fe: A Combinatorial Approach , 2007 .

[14]  D. Fabrègue,et al.  Modeling Grain Boundary Motion and Dynamic Recrystallization in Pure Metals , 2013, Metallurgical and Materials Transactions A.

[15]  D. Fabrègue,et al.  Nucleation of recrystallization in fine-grained materials: an extension of the Bailey–Hirsch criterion , 2013 .

[16]  J. Jonas.  Dynamic recrystallization—scientific curiosity or industrial tool? , 1994 .

[17]  G. Taylor.  The Mechanism of Plastic Deformation of Crystals. Part I. Theoretical , 1934 .

[18]  O. Bouaziz,et al.  Iso‐work Increment Assumption for Heterogeneous Material Behaviour Modelling , 2004 .

[19]  John W. Cahn,et al.  The Impurity‐Drag Effect in Grain Boundary Motion , 1962 .

[20]  Y. Bréchet,et al.  Modelling discontinuous dynamic recrystallization using a physically based model for nucleation , 2009 .

[21]  F. Montheillet,et al.  A grain scale approach for modeling steady-state discontinuous dynamic recrystallization , 2009 .