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首页> 外文期刊>Materials Science and Engineering >Creep rupture behavior of 9Cr-1.8W-0.5Mo-VNb (ASME grade 92) ferritic steel weld joint
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Creep rupture behavior of 9Cr-1.8W-0.5Mo-VNb (ASME grade 92) ferritic steel weld joint

机译：9Cr-1.8W-0.5Mo-VNb（ASME 92级）铁素体钢焊接接头的蠕变断裂行为

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摘要

Creep rupture behavior of 9Cr-1.8W-0.5Mo-VNb (ASME grade 92) ferritic steel weld joint fabricated by activated TIG (A-TIG) welding process have been investigated at 923 K over a stress range of 80-150 MPa. The weld joint was comprise of fusion zone, heat affected zone (HAZ) and base metal. The HAZ consisted of coarse prior-austenite grain (CGHAZ), fine prior-austenite grain (FGHAZ) and intercritical (ICHAZ) regions in an order away from the fusion zone to base metal. A hardness trough was observed at the outer edge of HAZ of the weld joint. TEM investigation revealed the presence of coarse M_(23)C_6 precipitates and recovery of martensite lath structure into subgrain in the ICHAZ of the weld joint, leading to the hardness trough. The weld joint exhibited lower creep rupture lives than the base metal at relatively lower stresses. Creep rupture failure location of the weld joint was found to shift with applied stress. At high stresses fracture occurred in the base metal, whereas failure location shifted to FGHAZ at lower stresses with significant decrease in rupture ductility. SEM investigation of the creep ruptured specimens revealed precipitation of Laves phase across the joint, more extensively in the FGHAZ. On creep exposure, the hardness trough was found to shift from the ICHAZ to FGHAZ. Extensive creep cavitation was observed in the FGHAZ and was accompanied with the Laves phase, leading to the premature type Ⅳ failure of the steel weld joint at the FGHAZ.
机译：通过活化TIG（A-TIG）焊接工艺制造的9Cr-1.8W-0.5Mo-VNb（ASME 92级）铁素体钢焊接接头的蠕变断裂行为已在923 K的80-150 MPa应力范围内进行了研究。焊接接头由熔合区，热影响区（HAZ）和贱金属组成。热影响区由粗大的奥氏体晶粒（CGHAZ），细的先奥氏体晶粒（FGHAZ）和临界区（ICHAZ）组成，其顺序是从熔合区到母材。在焊接接头的热影响区的外边缘观察到一个硬度槽。 TEM研究表明，在焊接接头的ICHAZ中存在粗大的M_（23）C_6析出物，马氏体板条结构恢复到亚晶粒中，从而导致了硬度低谷。在相对较低的应力下，焊接接头的蠕变断裂寿命比母材低。发现焊接接头的蠕变破裂失效位置随着施加的应力而移动。在高应力下，母材中发生断裂，而在较低应力下，失效位置转移到FGHAZ，断裂延展性显着降低。扫描电镜对蠕变破裂的样品进行了调查，结果发现在整个FGHAZ中，拉夫斯相在整个接头处都有沉淀。在蠕变暴露时，发现硬度槽从ICHAZ变为FGHAZ。在FGHAZ中观察到广泛的蠕变空化，并伴有Laves相，从而导致FGHAZ钢制焊接接头的Ⅳ型过早失效。

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  • 来源
    《Materials Science and Engineering》 |2014年第3期|111-120|共10页
  • 作者

    T. Sakthivel; M. Vasudevan; K. Laha; P. Parameswaran; K.S. Chandravathi; S. Panneer Selvi; V. Maduraimuthu; M.D. Mathew;

  • 作者单位

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

    Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;

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  • 正文语种 eng
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  • 关键词

    ASME grade 92 ferritic steel; Activated-TIG welding; Creep; Type Ⅳ cracking; Laves phase;

    机译：ASME 92级铁素体钢;活性TIG焊接;蠕变;Ⅳ型开裂;Laves相;

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