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Mechanical property-microstructure relationships of an X70 pipeline steel at elevated temperatures

机译：X70管线钢在高温下的机械性质 - 微结构关系

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摘要

Mechanical property-microstructure relationships of an X70 pipeline steel were evaluated at temperatures up to 400 °C using tensile testing, scanning and transmission electron microscopy, and synchrotron wide-angle X-ray scattering characterization techniques. The X70 steel had a bainitic microstructure consisting of quasi-polygonal ferrite, retained austenite, martensite-austenite islands, and carbideitride microconstituents. Results are compared to an X52 steel with a ferrite-pearlite microstructure. Both steels exhibited dynamic strain aging (DSA) as evidenced by serrated yielding, reductions in strain rate sensitivity, increased strengths, and reduced dutilities in the approximate temperature ranges of 100-250 °C. For temperatures above the DSA range, the X70 steel exhibited unique properties of an increase in strength simultaneously with an increase in uniform strain, both features interpreted due to microstructural changes during testing due to dynamic tempering, indicated by decomposition of the retained austenite and associated cementite and transition carbide nucleation and coarsening, i.e. microstructural changes normally associated with static tempering at temperatures above 400 °C. However, if the X70 steel was tempered at the test temperature prior to testing, dynamic microstructural changes were absent and the steel exhibited behavior similar to that observed for the X52 steel, i.e. a decrease in strength and increase in ductility at temperatures above the DSA range. New alloying strategies are suggested to improve microstructure stability during isothermal holds at elevated temperature, while maintaining the strength benefits from strain assisted bainitic tempering during plastic deformation.
机译：使用拉伸试验，扫描和透射电子显微镜，同步X70管线钢的机械性能 - 在高达400°C的温度下评估高达400°C的温度关系，以及同步辐射X射线散射特性技术。 X70钢具有由准多晶硅纹，保留奥氏体，马氏体 - 奥氏体岛和碳化物/氮化物微锁定组成的伯氏体微观结构。将结果与具有铁素体珠光体微观结构的X52钢进行比较。这两个钢都表现出动态应变老化（DSA），如锯齿状的产量所证明，应变率敏感性，增加的强度增加，并且在100-250℃的近似温度范围内降低的履约力降低。对于高于DSA范围的温度，X70钢的特性同时具有均匀菌株的增加，同时具有均匀菌株的增加，两种特征由于动态回火期间的测试期间的微观结构变化而解释，由保留的奥氏体和相关渗碳分解表明和过渡碳化物成核和粗化，即通常与400℃高于400℃温度的静态回火的微观结构变化。但是，如果在测试前在测试温度下回火X70钢，则不存在动态的微观结构变化，并且钢的表现出类似于X52钢的钢的行为，即DSA范围高于DSA范围的温度下降和延展性增加的行为。建议提高新的合金化策略，以提高在高温下的等温稳定期间的微观结构稳定性，同时在塑性变形期间保持来自应变辅助贝氏体回火的强度益处。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140041.1-140041.9|共9页
  • 作者

    T.R. Jacobs; K.O. Findley; J. Klemm-Toole; D.K. Matlock;

  • 作者单位

    Los Alamos National Laboratory PO Box 1663 Los Alamos NM 87545 USA Colorado School of Mines Advanced Steel Processing and Products Research Center 1500 Illinois Street Hill Hall Golden CO 80401 USA;

    Colorado School of Mines Advanced Steel Processing and Products Research Center 1500 Illinois Street Hill Hall Golden CO 80401 USA;

    Colorado School of Mines Advanced Steel Processing and Products Research Center 1500 Illinois Street Hill Hall Golden CO 80401 USA;

    Colorado School of Mines Advanced Steel Processing and Products Research Center 1500 Illinois Street Hill Hall Golden CO 80401 USA;

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  • 正文语种 eng
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  • 关键词

    Characterization; Stress-strain measurements; Iron alloys; Phase transformations;

    机译：特征;应力 - 应变测量;铁合金;相变;

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