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首页> 外文期刊>Materials Science and Engineering >Effect of the Laves phase and carbide on the creep strength of Fe-C-15Cr-W alloys
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Effect of the Laves phase and carbide on the creep strength of Fe-C-15Cr-W alloys

机译：疏浚相和碳化物对Fe-C-15Cr-W合金蠕变强度的影响

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摘要

To clarify the effects of the Fe_2W Laves phase and Cr_(23)C_6 carbide on the creep strength of a new ferritic heat-resistant steel with the ferrite parent phase strengthened by intermetallic compounds and carbonitrides, the creep strength at 973 K and microstructure of the ternary Fe-15Cr-(6, 9)W alloys and the quaternary Fe-0.05C-15Cr-(6, 9)W alloys (mass%) were investigated. Increasing the amount of Laves phase precipitates by increasing the tungsten content was effective in improving the creep strength due to the film-like Laves phase precipitates at the grain boundaries (GBs) of ferrite phase. Laves phase precipitates within the grains of ferrite phase became more uniform and finely distributed with the addition of carbon, but that did not improve the creep strength. Voids were formed around the Cr_(23)C_6 carbide precipitates at the GBs, and precipitate-free zones were observed around the GBs. We have concluded that these microstructures of the GBs caused creep rupture. In order to improve the creep strength of new precipitation-strengthened ferritic steel, reducing of the carbon content to suppress GB precipitation of Cr_(23)C_6 carbide, and increasing of the tungsten content to enhance the precipitation of Laves phase at the GBs are necessary.
机译：为了阐明Fe_2W Laves相和Cr_（23）C_6碳化物对新的铁素体耐热钢的蠕变强度，通过金属间化合物和碳氮化物加强的铁氧体母体相，蠕变强度为973k和微观结构研究了三元Fe-15cr-（6,9）W合金和季铵Fe-0.05C-15Cr-（6,9）W合金（质量％）。通过增加钨含量增加芳土沉淀物的量是有效的，在铁氧体相的晶界（GBS）处于膜状疏浚引起的裂解强度方面是有效的。 Laves相位在铁氧体相的晶粒内沉淀成更均匀，并随着添加碳而细腻分布，但这并未提高蠕变强度。在CR_（23）C_6碳化物周围形成空隙，在GBS处沉淀，并在GBS周围观察到沉淀的区域。我们得出结论，GB的这些微观结构引起了蠕变破裂。为了提高新的沉淀加强的铁素体钢的蠕变强度，降低碳含量以抑制CR_（23）C_6碳化物的GB沉淀，并增加钨含量以增强GBS在GBS上的灌注液沉淀。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140104.1-140104.9|共9页
  • 作者

    Yoshiaki Toda; Yuki Nakamura; Naomichi Harada; Akihiro Kaseya; Nina Kobata; Yoko Yamabe-Mitarai; Osamu Umezawa;

  • 作者单位

    Research Center for Structural Materials National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan;

    Graduate School of Engineering Science Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan;

    Graduate School of Engineering Science Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan;

    Graduate School of Engineering Science Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan;

    Research Center for Structural Materials National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan;

    Research Center for Structural Materials National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan Graduate School of Frontier Sciences The University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8561 Japan;

    Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan;

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  • 正文语种 eng
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  • 关键词

    Ferritic heat-resistant steel; Cr_(23)C_6 carbide; Fe_2W Laves phase; Precipitation; Grain boundary;

    机译：铁素体耐热钢;CR_（23）C_6硬质合金;fe_2w疏浚阶段;沉淀;晶界;

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