冷拉拔钢丝横截面应变不均匀性的晶体塑性研究

赵勇, 刘腾远, 贾春妮, 杨朕聃, 陈响军, 王培, 李殿中

Crystal Plasticity Study on the Non-uniformity of Strain on the Cross-section of Cold Drawn Steel Wire

ZHAO Yong, LIU Tengyuan, JIA Chunni, YANG Zhendan, CHEN Xiangjun, WANG Pei, LI Dianzhong

表2 计算等效珠光体材料的晶体塑性需要的参数

Table 2 Parameters required for crystal plasticity calculation of equivalent pearlite material

Parameter Symbol Value Elastic moduli C11 197000 MPa C12 134000 MPa C44 105000 MPa Rate sensitivity parameter n 10 [27] Reference strain rate a˙ 8.74 × 10-4 s-1 Burgers vector b 2.48 × 10-7 mm [28,29] Dislocation density gminter 0.6 evolution coefficient gimmob 0.035 grecov 80 gsour 10-5 Initial dislocation density ρim0 240000 mm-2 ρm0 240000 mm-2 Static yield stress τy 120 MPa [30,31] Shear moduli G 115022 MPa Interaction coefficient aαα 0.8 aαβ 0.6