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Special zone in multi-layer and multi-pass welded metal and its role in the creep behavior of 9Cr-1Mo welded joint

机译：多层多道焊接金属中的特殊区域及其在9Cr-1Mo焊接接头蠕变行为中的作用

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摘要

The creep properties of 9Cr-1Mo welded joint are determined by special zone (SZ) in equiaxed grain zone of welded metal (WM) suffered from multiple thermal cycles during multi-layer and multi-pass welding process. The SZ in WM was characterized in detail and its role in creep behavior was discussed in this paper. The creep test of 9Cr-1M welded joint was carried out in 566 degrees C under 270 MPa and 250 MPa, and great difference of fracture morphology was observed as "cup and cone and "wave" shapes, respectively. The cup and cone fracture consists of many deep and cone-shaped dimples. For wave-shaped fracture, some honeycomb-like structure is observed at bottom and top of wave, which is shallow and inclined to coalesce. Banded structure along prior austenite grain boundaries inside SZ is responsible for wave fracture. Some small grains with size of about 2 mu m are observed in banded structure, which increases the real length of the grain boundary and might deteriorate the creep performance. For long-term creep behavior, creep voids and cracks firstly form along boundaries of small grains in banded structure of SZ, and then creep crack propagates along the fusion line direction of weld beads. Grain boundary failure induced by banded structure is considered as the main rupture mechanism in this condition. (C) 2016 Elsevier Ltd. All rights reserved.
机译：9Cr-1Mo焊接接头的蠕变性能由多层和多道次焊接过程中经历多个热循环的焊接金属（WM）等轴晶粒区中的特殊区域（SZ）确定。详细介绍了WM中的SZ，并讨论了其在蠕变行为中的作用。 9Cr-1M焊接接头在566℃，270 MPa和250 MPa的条件下进行了蠕变试验，观察到断裂形态的差异很大，分别为“杯形和圆锥形”和“波形”形。波浪状的裂缝，在波浪的底部和顶部观察到一些蜂窝状的结构，浅而易合并，在SZ内部沿先前的奥氏体晶界的带状结构是导致波浪的原因。在带状结构中观察到一些小晶粒，尺寸约为2μm，这会增加晶界的真实长度，并可能降低蠕变性能；对于长期的蠕变行为，首先沿晶界形成蠕变空隙和裂纹。 SZ带状结构中的小晶粒，然后沿焊缝的熔合线方向蔓延，蠕变裂纹扩展，带状结构引起的晶界破坏被认为是这种断裂的主要机制。 健康）状况。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Materials & design》 |2016年第15期|195-206|共12页
  • 作者

    Liu Wen; Lu Fenggui; Wei Yuanhang; Ding Yuming; Wang Peng; Tang Xinhua;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Shanghai Turbine Plant Shanghai Elect Power Gener, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Shanghai Turbine Plant Shanghai Elect Power Gener, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China|Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    9Cr-1Mo; Welded metal; Creep behavior; Fracture morphology; Special zone;

    机译：9Cr-1Mo;焊接金属;蠕变行为;断裂形态;特殊区;

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