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首页> 外文期刊>Materials Science and Engineering >Correlation of microstructure and strain hardening behavior in the ultrafine-grained Nb-bearing dual phase steels
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Correlation of microstructure and strain hardening behavior in the ultrafine-grained Nb-bearing dual phase steels

机译：含Nb超细晶粒双相钢的组织与应变硬化行为的相关性

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摘要

Ultrafine-grained dual phase (DP) steels with different Nb contents (0.00,0.06 and 0.12 wt%) were produced by cold-rolling followed by intercritical annealing of ferrite/martensite starting microstructure at 770 °C for different holding times. Scanning electron microscopy, equipped with electron backscattered diffraction (EBSD) detector, nanoindentation and tensile testing were used to characterize microstructural evolutions and their correlations to the strain hardening and fracture behavior. EBSD results confirmed the retardation effect of Nb on recrystallization. It was found that the strains stored in the grains and density of geometrically necessary dislocations (GNDs) were increased with the addition of Nb. Strain hardening analysis showed that plastic deformation of the DP steels occurred in three distinct stages, which based on the EBSD results, nanoindentation and fracture analysis, were controlled by microstructural features such martensite volume fraction and size, density of GNDs and individual ferrite and martensite tensile properties.
机译：通过冷轧，然后在770°C的条件下进行不同保持时间的铁素体/马氏体起始组织的临界退火，生产出具有不同Nb含量（0.00、0.06和0.12 wt％）的超细晶粒双相（DP）钢。配备电子背散射衍射（EBSD）检测器的扫描电子显微镜，纳米压痕和拉伸测试用于表征微观结构演变及其与应变硬化和断裂行为的相关性。 EBSD结果证实了Nb对再结晶的阻滞作用。发现添加Nb会增加晶粒中存储的应变和必要的位错（GNDs）密度。应变硬化分析表明，DP钢的塑性变形发生在三个不同的阶段，这是基于EBSD结果，纳米压痕和断裂分析，由马氏体体积分数和大小，GND的密度以及单个铁素体和马氏体拉伸等微观结构特征控制的。属性。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|215-226|共12页
  • 作者

    A. Ghatei Kalashami; A. Kermanpur; E. Ghassemali; A. Najafizadeh; Y. Mazaheri;

  • 作者单位

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

    Joenkoping University, School of Engineering, Department of Materials and Manufacturing, P.O. Box 1026, SE-55111 Joenkoeping, Sweden;

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran,Department of Materials Engineering, Bu-Ali Sina University, Hamedan 65178-38695, Iran;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dual phase steel; Strain hardening behavior; Nanoindentation; EBSD; Nb;

    机译：双相钢;应变硬化行为;纳米压痕EBSD;铌;

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