Experimental and Numerical Investigations on the Damage Induced in the Shearing Process for QP980 Steel.
Experimental and Numerical Investigations on the Damage Induced in the Shearing Process for QP980 Steel.
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DOI：
10.3390/ma15093254
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发表时间：
2022-04-30
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影响因子：
--
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中科院分区：
文献类型：
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超高强度调质钢以其优异的力学性能在汽车制造中取得了显著的轻量化效果。然而，剪切边开裂问题极大地限制了它们的应用。本文对QP 980钢在剪切过程中产生的损伤进行了实验研究，包括微观组织表征和宏观/微观力学性能评价。此外，剪切变形模拟与六个广泛使用的损伤模型。实验结果表明，微孔洞、微裂纹和加工硬化行为是影响剪切边成形性的主要损伤因素。主要在相界面处形成的微孔洞尺寸较小（≤5 μm），而由少量夹杂物形成的微孔洞尺寸较大（>5 μm）。随着变形量的不断增加，分布在剪切表面周围的微孔被分裂成微裂纹，这些微裂纹在随后的成形步骤中充当裂纹引发剂。此外，断裂区的最高显微硬度进一步增强了边缘开裂的敏感性。通过在Abaqus中开发用户自定义子程序VUSDFLD，确定了QP 980钢的最佳损伤模型，可用于预测QP 980钢的断裂行为，以降低边缘开裂的风险。
Ultra-high-strength quenching and partitioning (Q&P) steels have achieved remarkable lightweight effect in automotive manufacture due to the excellent mechanical performances. However, the problem of sheared-edge cracking greatly limits their application. In this work, the damage generated in the shearing process of QP980 steel is experimentally investigated via microstructure characterization and micro-/macromechanical property evaluation. Moreover, the shearing deformation is simulated with six widely used damage models. The experimental results reveal that microvoids, microcracks, and work-hardening behavior are the main damage factors affecting the formability of sheared edges. Microvoids mainly formed at phase interfaces have a small size (≤5 μm), while microvoids generated from inclusions with a small number have a large size (>5 μm). As deformation continuously grows, microvoids distributed around the sheared surface are split into microcracks, which act as crack initiators in the subsequent forming step. Additionally, the highest microhardness in the fracture zone further enhances the susceptibility of edge cracking. Furthermore, the optimum damage model for QP980 steel was determined by developing user-defined subroutine VUSDFLD in Abaqus, which can be used in the prediction of fracture behavior of QP980 steel to reduce the risk of edge cracking.
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影响因子：
13.1
作者：
Kolanu, Naresh Reddy;Raju, Gangadharan;Ramji, M.
通讯作者：
Ramji, M.
影响因子：
2.2
作者：
Chang, Ying;Han, Shuo;Dong, Han
通讯作者：
Dong, Han
光纤激光焊接QP980钢的显微组织与力学性能
DOI：
10.1016/j.jmatprotec.2018.02.015
发表时间：
2018-06-01
影响因子：
6.3
作者：
Guo, Wei;Wan, Zhandong;Peng, Yun
通讯作者：
Peng, Yun
DOI：
10.1016/j.jmatprotec.2021.117377
发表时间：
2021-09-24
影响因子：
6.3
作者：
Han, S.;Chang, Y.;Dong, H.
通讯作者：
Dong, H.
影响因子：
6.3
作者：
Hatanaka, N;Yamaguchi, K;Iizuka, T
通讯作者：
Iizuka, T