Constitutive equation and dynamic recrystallization behavior of ultra high strength steel A100
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摘要: 使用Gleeble-3500热模拟试验机对A100超高强度钢在应变速率为0.01～10 s−1、变形量为 63.3% 、变形温度为850～1200 ℃条件下的流变应力行为进行了试验研究，并结合微观组织分析了不同变形条件下动态再结晶行为。结果表明：A100钢热压缩变形中流变应力随温度的增加而降低，随应变速率的增加而增加。在850 ℃变形时主要发生动态回复，在变形温度为900～1200 ℃、应变速率为0.01～10 s−1均发生动态再结晶。基于Arrhenius双曲正弦模型，利用线性回归方法建立了高强钢A100的本构方程，为A100钢的数值模拟和热加工工艺的制定提供了理论基础。Abstract: The flow stress behavior of A100 ultra-high strength steel under the conditions of strain rate of 0.01~10 s−1, deformation of 63.3% and deformation temperature of 850～1 200 ℃ was studied by compression test with a Gleeble-3500 thermal simulation test machine, and the dynamic recrystallization behavior under different deformation conditions was analyzed combined with microstructure observation. The results show that the flow stress of A100 steel decreases with the increase of temperature and increases with the increase of strain rate. Dynamic recovery mainly occurs at 850 ℃, and dynamic recrystallization occurs at deformation temperature of 900～1 200 ℃ and strain rate of 0.01～10 s−1. Based on Arrhenius hyperbolic sine model, the constitutive equation of high strength steel A100 is established by using linear regression method, which provides a theoretical basis for the numerical simulation of A100 steel and the formulation of hot working process.
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图 1 变形温度一定、不同变形速率的真实应力-应变曲线
Figure 1. True stress-strain curve of samples deformed at different temperatures and strain rates
图 2 变形温度850 ℃、变形速率1 s−1的金相组织
Figure 2. Metallographic structure of sample after deformation at 850 ℃ and deformation rate of 1 s−1
图 3 不同变形温度下热压缩A100钢的显微组织(
${\dot{\varepsilon }}$ =10 s−1)Figure 3. Microstructure of hot compressed A100 steel at different deformation temperatures (
$\dot {\varepsilon }$ =10 s−1)
图 4 变形速率一定、不同变形温度的真实应力-应变曲线
Figure 4. True stress-strain curves of samples deformed at different temperatures and strain rates
图 5 不同变形温度下热压缩A100 钢的显微组织
Figure 5. Microstructure of hot compressed A100 steel at different deformation temperatures
图 6 应变速率
$\dot {\textit{ε}}$ 与峰值应力$ {{\textit{σ}}_{\text{p}}} $ 的关系Figure 6. Relationship between strain rate and peak stress
图 7 ln
$\dot {\textit{ε}}$ 与lnsinh (ασp)之间的关系Figure 7. Relationship between ln
$\dot {\textit{ε}}$ and lnsinh (ασp)
图 8 lnsinh (ασp)与
$\dfrac{{\text{1}}}{{{T}}}$ 之间的关系Figure 8. Relationship between lnsinh (ασp) and
$\dfrac{{\text{1}}}{{{T}}}$ -
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