Study on Microstructural Evolution of DP Steel Considering the Interface Layer Based on Multi Mechanism Strain Gradient Theory

被引：1

作者：

Zhuang, Qianduo ^{[1
]}

Yue, Zhenming ^{[1
]}

Zhou, Lingxiao ^{[1
]}

Zhao, Xihang ^{[1
]}

Qi, Jiashuo ^{[1
]}

Min, Xinrui ^{[1
]}

Zhang, Zhongran ^{[1
]}

Gao, Jun ^{[1
]}

机构：

[1] Shandong Univ Weihai, Sch Mech Elect & Informat Engn, Weihai 264209, Peoples R China

来源：

MATERIALS | 2022年 / 15卷 / 13期

基金：

中国国家自然科学基金;

关键词：

microstructures; geometrically necessary dislocations; local hardening; topology optimization; dual-phase steel; DUAL-PHASE STEEL; PLASTIC-DEFORMATION; BEHAVIOR; FERRITE; MODEL; DISLOCATIONS; SIMULATION;

D O I：

10.3390/ma15134590

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A multi-mechanism constitutive model is proposed in this paper to better describe the effect of the local hardening behavior of the interface layer on the mechanical heterogeneity of dual-phase (DP) steel. The constitutive equations considering the geometrically necessary dislocations (GNDs) and back stress at grain level and sample level were established. Based on the finite element simulation results, the influences of local hardening and microstructure characteristics on the strain-stress evolution, statistical storage dislocations, GNDs, and back stress of DP steel were studied and discussed. Due to the local hardening effect, the ferrite phase was treated as an inhomogeneous matrix reinforced by some small islands of martensite in the simulation. The simulation results show that the thickness of the interface layer has a significant effect on the macroscopic hardening property of DP steel, while the number of interface layers has little effect. Meanwhile, the GNDs and back stress at the grain level also have little effect on the strengthening of DP steel. The contribution of GNDs at the sample level to the flow stress is about 47%.

引用

页数：20

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