基于位错密度的Fe-22Mn-0.6C型TWIP钢物理本构模型研究

孙朝阳, 黄杰, 郭宁, 杨竞

A PHYSICAL CONSTITUTIVE MODEL FOR Fe-22Mn-0.6C TWIP STEEL BASED ON DISLOCATION DENSITY

SUN Chaoyang, HUANG Jie, GUO Ning, YANG Jing

表1 常温下Fe-22Mn-0.6C钢的材料常数及拟合参数

Table 1 Values of physical constant parameters of Fe-22Mn-0.6C steel at room temperature

Parameter Physical meaning Value μ Shear modulus / GPa 69 E Young′s modulus / GPa 200 b Magnitude of Burgers vector / m 2.5×10-10 M Taylor factor 3.06 α Mean dislocation strength 0.0895 d Grain size / μm 50 k Forest hardening 0.032 f Dynamic recovery 0.002 ρ0 Initial dislocation density / m2 10-10 F0 Maximum volume fraction of twins 0.2 e Twin mean thickness / nm 100 εinit Critical strain at which twinning begins 0.05 β Material constant 10 m Material constant 11