(1. College of Materials and Metallurgy, University of Guizhou, Guiyang 550025, Guizhou, China 2. Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang 550025, Guizhou, China 3. National and Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology, Guiyang 550025, Guizhou, China)
Abstract:The constitutive equation of the strain compensation and the dynamic recrystallization behavior of 20CrNi2Mo steel at temperatures ranging from 900 to 1 050 ℃ and stain rates from 0.001 to 1 s-1 were studied by isothermal single-pass compression tests carried out on DIL805A/T thermo-mechanical simulator,which can provide theoretical guidance for the plastic deformation behavior and organizational control of 20CrNi2Mo steel. The correlation[(R)] and the average relative error[(AARE)]are 0.992 1 and 3.019 2% respectively between the magnitudes of the flow stress calculated by the proposed model and the experimental results. The critical dynamic recrystallization model was established after the inflection points were solved by fitting a third order polynomial to the[θ-σ]curves. And the complexity of dynamic recrystallization was analyzed by microstructure of different deformation processes. Results show that the tested steel all recrystallized in this study. And the higher the deformation temperature and the smaller the strain rate,the more the dynamic recrystallization volume fraction was. The critical stress model and critical strain model for dynamic recrystallization of parameter[Z]was established.
张世伟,,杨 明, ,梁益龙,,姜 云,龙绍檑,. 20CrNi2Mo钢高温变形的本构方程与动态再结晶行为[J]. 钢铁, 2017, 52(8): 97-105.
ZHANG Shi-wei,,,YANG Ming,,,LIANG Yi-long,,,JIANG Yun,,LONG Shao-lei,,. Constitutive equations and dynamic recrystallization behaviors of 20CrNi2Mo steel at stage of high temperature deformation. Iron and Steel, 2017, 52(8): 97-105.
Wang Z, Fu W, Wang B, et al.Study on hot deformation characteristics of 12%Cr ultra-super-critical rotor steel using processing maps and Zener–Hollomon parameter[J].Materials Characterization, 2010, 61(1):25-30
Stewart G R, Jonas J J, Montheillet F.Kinetics and Critical Conditions for the Initiation of Dynamic Recrystallization in 304 Stainless Steel[J].Isij International, 2004, 44(9):1581-1589
Poliak E I, Jonas J J.A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization[J].Acta Materialia, 1996, 44(1):127-136
Stewart G R, Jonas J J, Montheillet F.Kinetics and Critical Conditions for the Initiation of Dynamic Recrystallization in 304 Stainless Steel[J].Isij International, 2004, 44(9):1581-1589
Mcqueen H J, Ryan N D.Constitutive analysis in hot working[J].Materials Science & Engineering A, 2002, 322(1–2):43-63
[15]
Poliak E I, Jonas J J.A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization[J].Acta Materialia, 1996, 44(1):127-136
Poliak E I, Jonas J J.Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation[J].Isij International, 2003, 43(5):684-691
[24]
Ryan N D, Mcqueen H J.Dynamic recovery,strain hardening and flow stress in hot working of 316 steel[J].Czechoslovak Journal of Physics, 1989, 39(4):458-465
Najafizadeh A, Jonas J J.Predicting the Critical Stress for Initiation of Dynamic Recrystallization[J].Isij International, 2006, 46(11):1679-1684
[24]
Ryan N D, Mcqueen H J.Dynamic recovery,strain hardening and flow stress in hot working of 316 steel[J].Czechoslovak Journal of Physics, 1989, 39(4):458-465
[25]
Najafizadeh A, Jonas J J.Predicting the Critical Stress for Initiation of Dynamic Recrystallization[J].Isij International, 2006, 46(11):1679-1684
[26]
Mwembela A, Konopleva E B, Mcqueen H J, et al.Microstructural development in Mg alloy AZ31 during hot working[J].Scripta Materialia, 1997, 37(11):1789-1795
[26]
Mwembela A, Konopleva E B, Mcqueen H J, et al.Microstructural development in Mg alloy AZ31 during hot working[J].Scripta Materialia, 1997, 37(11):1789-1795
[27]
Myshlyaev M M, Mcqueen H J, Mwembela A, et al.Twinning, dynamic recovery and recrystallization in hot worked Mg- Al- Zn alloy[J]. Materials Science and Engineering: A, 2002, 337: 121-133
[27]
Myshlyaev M M, Mcqueen H J, Mwembela A, et al.Twinning, dynamic recovery and recrystallization in hot worked Mg- Al- Zn alloy[J]. Materials Science and Engineering: A, 2002, 337: 121-133