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首页> 外文期刊>ISIJ international >Creep Lifetime Reduction in Heat Affected Zone in Boron-Added 9Cr Heat Resistant Steel
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Creep Lifetime Reduction in Heat Affected Zone in Boron-Added 9Cr Heat Resistant Steel

机译：在硼添加的9CR耐热钢中蠕变寿命减少热影响区域

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摘要

Boron-added 9Cr-3W-3Cr-VNb ferritic/martensitic heat resistant (MARBN12) steel is the candidate material for components used at intermediate temperatures, i.e., 923 K or less, in advanced ultra-supercritical (A-USC) power generation systems because they can suppress Type Ⅳ fracture under creep conditions. For evaluation of the creep strength of the heat affected zone (HAZ), simulated HAZ samples with peak temperatures of about 1 173 K. 1 223 K, 1 273 K, and 1 323 K with a heating rate of 100 K/s and a cooling rate of 40 K/s were crept at 923 K. Compared with the conventional Gr. 92 steel, the B-added steel showed about 10 times longer creep lifetime. Furthermore, minimum creep lifetime was observed around the A_(C3) point of about 1 223 K. Electron back-scattered diffraction analyses revealed that clear fine-grained HAZ was not formed and that martensite remained in the simulated HAZ samples of the MARBN12 steel. Microstructural change occurred only around the prior austenite grain boundary (PAGB), i.e., fine grains were formed there. It generated grain boundary sliding in the vicinity around PAGB, leading to shorter creep lifetime than the base metal. Results show that the creep lifetime around HAZ in the MARBN12 steel was affected by the microstructure near PAGB. Also, that in the Gr. 92 steel was influenced by the grain size, i.e.. Type Ⅳ fracture.
机译：添加的9CR-3W-3CR-VNB铁素体/马尔氏耐热（MARBN12）钢是在先进的超超临界（A-USC）发电系统中中间温度，即923 k或更低的组分的候选材料因为它们可以在蠕变条件下抑制ⅳ骨折。为了评估热影响区（HAZ）的蠕变强度，模拟HAZ样品的峰值温度为约1173k，1 273k和1323k，加热速率为100 k / s和a与常规GR相比，40k / s的冷却速率在923k中悄然。 92钢，B加入钢显示寿命长度约10倍。此外，在约1223k的A_（C3）点周围观察到最小蠕变寿命。电子背散衍射分析显示，未形成透明细粒粗糙的HAZ，并且马氏体仍然存在于MARBN12钢的模拟HAZ样品中。微观结构变化仅发生在先前奥氏体晶界（PAGB）周围发生，即在那里形成细粒。它产生晶界在PAGB周围的附近滑动，导致比基础金属更短的蠕变寿命。结果表明，马布12钢中HAZ周围的蠕变寿命受Pagb附近的微观结构的影响。而且，在gr中。 92钢受到晶粒尺寸的影响，即型ⅳ骨折。

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  • 来源
    《ISIJ international》 |2020年第6期|1342-1348|共7页
  • 作者

    Tetsuya MATSUNAGA; Hiromichi HONGO; Masaaki TABUCHI; Yoko YAMABE-MITARAI;

  • 作者单位

    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;

    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;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    B-added steel; creep; heat affected zone; Type Ⅳ fracture; welding;

    机译：B加入钢;蠕动;热影响区;Ⅳ型骨折;焊接;

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