摘要
为探究组织不均匀性对低合金高强度钢(HSLA)的性能影响,利用Ashby-Orowan弥散强化机制与Hall-Petch细晶强化机制下的强化模型,得到了基于微观组织结构下的应力-应变本构方程。通过采用ABAQUS有限元软件模拟Q460D钢单轴拉伸断裂过程代表性体积单元受力情况,探讨了微观组织形貌对低合金高强度钢的力学性能的影响,并与试验结果进行了比较。结果表明,微观本构模型能够较好的反映组织形貌对低合金高强度钢力学性能,以及断裂方式的影响,并且模拟发现在低合金高强度钢断裂过程中,裂纹最先形成于珠光体晶粒粗大且分布不均匀的区域。
In order to investigate the influence of in_homogeneous microstructure on the properties of low alloy highstrength steel （HSLA steel）, a stress-strain constitutive equationwas obtained which was based on the model of Ashby-Orowan dispersion strengthening mechanism and Hall-Petch fine grain strengthening mechanism. The ABAQUS finite element software to simulate the stress condition of the RVE during the fracture process of the Q460D steel was investigated, finally, compared with the actual test results. The results show that the constitutive model can well reflect the mechanical properties and fracture mode of low alloy high strength steel, the crack is ftrst formed in the coarse and uneven distribution of the pearlite grain in the fracture process of the low alloy high strength steel.
出处
《铸造技术》
CAS
2018年第2期306-311,共6页
Foundry Technology
