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Anisotropy and microstructural evolutions of X70 pipeline steel during tensile deformation

机译：X70管线钢拉伸变形的各向异性和组织演变。

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摘要

Tensile properties of different directions of X70 pipeline steel plate were tested, and microstructural evolutions of different zones along the transverse direction (TD) were also investigated using electron backscatter diffraction. The highest strength values (yield strength and ultimate strength) appear at TD, and the diagonal direction shows the largest uniform elongation. The elongations of the polygonal ferrite and quasi polygonal ferrite grains increase with the decrease in the distance to the fracture zone. The ratio between high-angle grain boundaries and low-angle grain boundaries in the as-received steel is about 7/3 and starts to decrease from the fillet zone to the fracture zone. The refinement of grains occurs adjacent to the fracture section with the formation of subgrains. With the increase in tensile strain, the intensities of cube and gamma-fiber textures increase sharply, and the reinforcement of the (111)[(1) over bar(1) over bar2] component was obviously larger than the (111)[1 (2) over bar1] component in the gamma-fiber texture during tensile deformation.
机译：测试了X70管道钢板不同方向的拉伸性能，并使用电子背散射衍射研究了沿横向（TD）的不同区域的组织演变。最高强度值（屈服强度和极限强度）出现在TD处，对角线方向显示最大的均匀伸长率。多边形铁素体和准多边形铁素体晶粒的伸长率随着到断裂区域的距离的减小而增加。所接收的钢中的高角度晶界和低角度晶界之间的比率约为7/3，并且从圆角区域到断裂区域开始减小。晶粒细化在断裂区域附近发生，并形成亚晶粒。随着拉伸应变的增加，立方纤维和伽玛纤维质地的强度急剧增加，（111）[（1）超过bar（1）超过bar2]组件的增强明显大于（111）[1 （2）在拉力变形过程中，伽玛纤维质地中的bar1]成分上方。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3512-3520|共9页
  • 作者

    Gao Qiuzhi; Lu Cheng; Li Huijun; Li Jintao; Han Tian; Chen Liang;

  • 作者单位

    Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Hebei, Peoples R China|Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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