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首页> 外文期刊>Materials Science and Engineering >Evolution of precipitated phases during prolonged tempering in a 9OCr1%MoVNb ferritic-martensitic steel: Influence on creep performance
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Evolution of precipitated phases during prolonged tempering in a 9OCr1%MoVNb ferritic-martensitic steel: Influence on creep performance

机译：9OCr1％MoVNb铁素体-马氏体钢在长时间回火期间析出相的演变：对蠕变性能的影响

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摘要

Ferntic-martensitic steels of the 9%Cr1%Mo type have been extensively used in power plant components, heat exchangers, piping and tubing, etc., due to an excellent combination of properties such as creep resistance, toughness and resistance to oxidation at high temperatures. In these steels the stabilizing role of MX carbonitrides (M = Nb, V; X-C, N) is one of the main factors responsible for the resistance under creep conditions. The control of precipitation and coarsening of MX phases during prolonged, high temperature tempering or post-weld heat treatment is then a key point to obtain the desirable microstructure and hence, to achieve high temperature resistance under service conditions. In the present contribution we report the evolution of the precipitated phases during heat treatment at 780 ℃ for increasing times in the range 40 min to 7 h for an ASTM A213 T91 steel. The Nb and V contents in solid solution were determined as a function of the time of treatment and maxima were observed for 5 and 5.66 h, respectively. Creep tests to rupture were also conducted at 600 ℃ - 190 MPa for as-treated specimens. A maximum creep rate was observed to occur in coincidence with the maximum values of Nb and V contents in solid solution. We suggest possible relationships between the observed second phase evolution and the creep resistance behavior.
机译：9％Cr1％Mo型铁素体-马氏体钢由于具有优异的综合性能，如耐蠕变性，韧性和高温抗氧化性，因此已广泛用于发电厂组件，热交换器，管道和管道等。温度。在这些钢中，MX碳氮化物（M = Nb，V; X-C，N）的稳定作用是引起蠕变条件下的电阻的主要因素之一。因此，在长时间的高温回火或焊后热处理过程中，控制MX相的析出和粗化是获得所需显微组织并因此在使用条件下获得耐高温性能的关键。在本论文中，我们报告了ASTM A213 T91钢在780℃热处理过程中，析出相在40分钟至7小时内的增加时间。确定固溶体中的Nb和V含量随处理时间的变化，分别在5 h和5.66 h内观察到最大值。对于处理后的试样，还在600℃-190 MPa下进行了蠕变断裂试验。观察到最大蠕变速率与固溶体中Nb和V含量的最大值一致。我们建议观察到的第二相演变与抗蠕变行为之间可能的关系。

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  • 来源
    《Materials Science and Engineering》 |2011年第12期|p.4019-4029|共11页
  • 作者

    N.Zavaleta Gutierrez; H. De Cicco; J. Marrero; C.A. Danon; M.I. Luppo;

  • 作者单位

    Materials Department, National Atomic Energy Commission, Av. Cral. Paz 1499, B1650KNA San Martin, Buenos Aires, Argentina , Permanent address: Engineering School, Mining and Metallurgy Department,Av. Juan Pablo Ⅱ s Trujillo National University, Peru;

    Materials Department, National Atomic Energy Commission, Av. Cral. Paz 1499, B1650KNA San Martin, Buenos Aires, Argentina;

    Nuclear Fuel Department, National Atomic Energy Commission, Argentina;

    Materials Department, National Atomic Energy Commission, Av. Cral. Paz 1499, B1650KNA San Martin, Buenos Aires, Argentina;

    Materials Department, National Atomic Energy Commission, Av. Cral. Paz 1499, B1650KNA San Martin, Buenos Aires, Argentina;

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  • 正文语种 eng
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  • 关键词

    steel precipitation electron microscopy microanalysis;

    机译：钢沉淀电子显微镜显微分析;

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