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Effects of tempering mode on the structural changes of martensite

机译：回火方式对马氏体组织变化的影响

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摘要

Tempered martensite obtained from four different tempering modes were characterized using transmission electron microscopy, high-angle annular dark field scanning transmission electron microscopy, and nanoindentation techniques. Crystallographic analysis of tempered martensite revealed that ferrite (α) and cementite (θ) obtained via furnace and Gleeble heat treatment obeyed the Isaichev orientation (or close to it) with [311]_θ 0.91° from [111]_α and the [112]_α‖[001]_θ Bagaryatsky orientation relationship. A strict orientation relationship between ferrite and cementite could not be determined on the tempered structure extracted from the sub-critical heat affected zone of two different laser beam welded samples. Extensive recovery and reduction of boundary regions was identified on the structure tempered slowly, whereas rapidly tempered structures retained a high density of dislocation and less decomposition of the lath structure. The relationship between dislocation density and modified tempering parameter was determined and their contributions on tensile strength were evaluated.
机译：使用透射电子显微镜，高角度环形暗场扫描透射电子显微镜和纳米压痕技术表征了从四种不同回火模式获得的回火马氏体。回火马氏体的晶体学分析表明，通过熔炉和Gleeble热处理获得的铁素体（α）和渗碳体（θ）符合（或接近）Isaichev取向，与[111]_α和[112]的取向为[311]_θ0.91°。 _α‖[001]_θBagaryatsky定向关系。从两个不同的激光束焊接样品的亚临界热影响区提取的回火结构无法确定铁素体与渗碳体之间的严格取向关系。在缓慢回火的结构上发现了边界区域的广泛恢复和减少，而快速回火的结构保留了高的位错密度和较少的板条结构分解。确定位错密度和修正的回火参数之间的关系，并评估它们对拉伸强度的贡献。

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  • 来源
    《Materials Science and Engineering》 |2016年第15期|467-475|共9页
  • 作者

    D.C. Saha; E. Biro; A.P. Gerlich; Y. Zhou;

  • 作者单位

    Centre for Advanced Materials Joining, Department of Mechanical & Mechatronics Engineering. University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1;

    ArcelorMittal Global Research, 1390 Burlington Street East, Hamilton, ON, Canada L8N 3J5;

    Centre for Advanced Materials Joining, Department of Mechanical & Mechatronics Engineering. University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1;

    Centre for Advanced Materials Joining, Department of Mechanical & Mechatronics Engineering. University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1;

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  • 正文语种 eng
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  • 关键词

    Martensite tempering; Transmission electron microscopy; Crystallography; Dislocation density; Nanoindentation; Strength;

    机译：马氏体回火;透射电子显微镜;晶体学位错密度;纳米压痕强度;

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