Dynamic recrystallization （DRX） behaviors of a heat-resistant martensitic stainless steel 403Nb during hot deformation have been investigated by single-pass thermo-mechanical simulative experiment at temperatures of 900-1150℃ and strain rates of 0.01-1 s-1 The results show that the true stress-true strain curves of this alloy can be classified into two types, one is of dynamic recovery and the other is of dynamic recrystallization. The DRX in 403Nb alloy is easy to occur at strain rates lower than 0.5 s-1 and deformation temperatures higher than 1000℃. Using regression analysis, the stress multiplier （a） and apparent stress exponent （n） were calculated to be 0.0153 and 3.22, respectively, while the activation energy （Qd） for DRX of 403Nb was calculated to be 367.293 kJ/mol. The constitutive equation of peak stress for DRX was also obtained. Based on P-J method, the critical strain for DRX was accurately determined. The mathematical models of peak strain and kinetic equation for DRX of 403Nb steel were finally established.
参考文献
| [1] | F. Abe;T. Horiuchi;M. Taneike .Stabilization of martensitic microstructure in advanced 9Cr steel during creep at high temperature[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):299-303. |
| [2] | M.Jafari,A.Najafizadeh.Comparison between the Methods of Determining the Critical Stress for Initiation of Dynamic Recrystallization in 316 Stainless Steel[J].材料科学技术学报(英文版),2008(06):840-844. |
| [3] | J. H. Bianchi;L.P. Karjalainen .Modelling of dynamic and metadynamic recrystallisation during bar rolling of a medium carbon spring steel[J].Journal of Materials Processing Technology,2005(3):267-277. |
| [4] | S.F.MEDINA;C.A.HERNANDEZ .GENERAL EXPRESSION OF THE ZENER-HOLLOMON PARAMETER AS A FUNCTION OF THE CHEMICAL COMPOSITION OF LOW ALLOY AND MICROALLOYED STEELS[J].Acta materialia,1996(1):137-148. |
| [5] | S.F.MEDINA;C.A.HERNANDEZ .THE INFLUENCE OF CHEMICAL COMPOSITION ON PEAK STRAIN OF DEFORMED AUSTENITE IN LOW ALLOY AND MICROALLOYED STEELS[J].Acta materialia,1996(1):149-154. |
| [6] | S.F.MEDINA;C.A.HERNANDEZ .MODELLING OF THE DYNAMIC RECRYSTALLIZATION OF AUSTENITE IN LOW ALLOY AND MICROALLOYED STEELS[J].Acta materialia,1996(1):165-171. |
| [7] | E.I.POLIAK;J.J.JONAS .A ONE-PARAMETER APPROACH TO DETERMINING THE CRITICAL CONDITIONS FOR THE INITIATION OF DYNAMIC RECRYSTALLIZATION[J].Acta materialia,1996(1):127-136. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%