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首页> 外文期刊>Materials Science and Engineering >Microstructural change of a 9Cr steel longitudinal welded tube under internal pressure creep loading
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Microstructural change of a 9Cr steel longitudinal welded tube under internal pressure creep loading

机译：内压蠕变载荷下9Cr钢纵向焊管的组织变化。

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摘要

In this study, the microstructure of a base metal, and the heat-affected zone (HAZ) and weld metal of a 9Cr steel longitudinal welded tube with various internal pressure creep damage levels was studied by transmission electron microscopy and energy dispersive X-ray spectroscopy. Each portion of the steel weldment clearly changed with damage level. The present results indicate that the recovery of the microstructure is faster in HAZ than in other portions, and thus creep deformation preferentially occurs in HAZ. Moreover, it was revealed that stress accelerates the growth of M_(23)C_6 precipitates as well as the reduction of dislocation density, consequently promoting recovery. It was also confirmed that the so-called type IV failure is reasonably explained by precipitate strengthening.
机译：在这项研究中，通过透射电子显微镜和能量色散X射线光谱法研究了具有不同内部压力蠕变损伤水平的9Cr钢纵向焊管的母材金属组织，热影响区（HAZ）和焊缝金属。 。钢焊件的每个部分随损坏程度明显变化。目前的结果表明，在热影响区中，显微组织的恢复比其他部分要快，因此在热影响区中优先发生蠕变变形。此外，揭示了应力加速了M_（23）C_6沉淀物的生长以及位错密度的降低，从而促进了恢复。还证实了所谓的IV型破坏可以通过析出物强化得到合理解释。

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  • 来源
    《Materials Science and Engineering》 |2013年第10期|450-457|共8页
  • 作者

    Susumu Yamada; Masatsugu Yaguchi; Takashi Ogata;

  • 作者单位

    Central Research Institute of Electric Power Industry (CRIEPI), Materials Science Research Laboratory, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan,Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan;

    Central Research Institute of Electric Power Industry (CRIEPI), Materials Science Research Laboratory, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan;

    Central Research Institute of Electric Power Industry (CRIEPI), Public Communication Group, Ohtemachi Bldg., 1-6-1 Ohtemachi, Chiyoda-ku, Tokyo 100-8126, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    9cr steel; longitudinal welded tube; internal pressure creep; dislocations; precipitates;

    机译：9cr钢;纵向焊管;内部压力蠕变脱臼;沉淀;

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