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首页> 外文期刊>ISIJ international >In-situ Observation of δ↔γ Phase Transformations in Duplex Stainless Steel Containing Different Nitrogen Contents
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In-situ Observation of δ↔γ Phase Transformations in Duplex Stainless Steel Containing Different Nitrogen Contents

机译：氮含量不同的双相不锈钢中δ↔γ相变的原位观察

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摘要

The characteristics of the δ↔γ phase transformations were observed on the surface of duplex stainless steels with different nitrogen concentrations by the Ultra High Temperature Confocal Laser Scanning Microscope (UHT-CSLM). The effects of the nitrogen content on the phase transformations are discussed based on the experimental results and thermodynamic calculations. It is found that the migration of the δ/γ lB is the main form of the phase transformation and leads to the continuous decline and final disappearance of the retained y-phase during the δ→γ phase transformation in the high nitrogen steel (N1) and low nitrogen steel (N2). During the δ→γ phase transformation, the y-cells prefer to precipitate along the δ/δ GBs and develop into the δ-ferrite matrix with finger-like or sword-like patterns. Then the y-cells also nucleate in the δ-grains with a sword-like pattern and the growing speed in the longitudinal direction is much faster than that in the lateral direction. More importantly, the high nitrogen content can hinder the migration of δlγ IBs during the γ→δ transformation and also promote the nucleation and growth of γ-phase during the δ→γ transformation by increasing both the starting and finishing temperatures of the phase transformation. Interestingly, the original δ/δ GB which is covered by the precipitation of y-phase during the δ→γ transformation will reappear first at the same position by the moving of Sly IBs during the γ→δ transformation, but it is unstable and migrates fast with further heating.
机译：用超高温共聚焦激光扫描显微镜（UHT-CSLM）在不同氮含量的双相不锈钢表面观察到δ↔γ相变的特征。基于实验结果和热力学计算，讨论了氮含量对相变的影响。发现在高氮钢（N1）中，δ/γlB的迁移是相变的主要形式，并导致δ→γ相变过程中保留的y相连续下降和最终消失。和低氮钢（N2）。在δ→γ相变过程中，y单元倾向于沿δ/δGBs沉淀，并发展为具有手指状或剑状图案的δ铁素体基体。然后，y细胞也以剑状图案在δ晶粒中成核，并且在纵向方向上的生长速度比在横向方向上的生长速度快得多。更重要的是，高氮含量可通过增加相变的开始和结束温度来阻碍γ→δ转变过程中δlγIBs的迁移，并促进δ→γ转变过程中γ相的形核和生长。有趣的是，在δ→γ转换过程中被y相沉淀覆盖的原始δ/δGB将首先在γ→δ转换过程中通过Sly IBs的移动重新出现在同一位置，但不稳定并迁移。快速加热。

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  • 来源
    《ISIJ international》 |2017年第9期|1637-1644|共8页
  • 作者

    Yong ZHAO; Yanhui SUN; Xiaobin Ll; Fangyuan SONG;

  • 作者单位

    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083 People's Republic of China;

    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083 People's Republic of China;

    Building and Construct Research Institute Co., Ltd. of MCC, Beijing, 100083 People's Republic of China;

    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing, 100083 People's Republic of China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    in-situ observation; phase transformation; nitrogen; duplex stainless steel; migration; growth;

    机译：现场观察;相变氮;双相不锈钢;移民;成长;

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