• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Effect of Si content on microstructure and cryogenic toughness of heat affected zone of low nickel steel
【24h】

Effect of Si content on microstructure and cryogenic toughness of heat affected zone of low nickel steel

机译：硅含量对低镍钢热影响区组织和低温韧性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Compared with 9%Ni steel, low nickel steel has great advantages in cost and weldability. However, cryogenic toughness of the heat affected zone (HAZ) of conventional low nickel steel deteriorates, which limits its application in the construction of liquefied natural gas tanks. In this work, two low nickel steels with different Si contents were designed, and the relationship between Si content and HAZ cryogenic toughness of these steel samples was investigated. After reducing Si content, the required Charpy impact absorbed energy was obtained in the HAZ at fusion line and 1 inns from fusion line. Microstructural characterization revealed that the reduction in Si content promoted auto-tempering of coarse-grained HAZ (CGHAZ), leading to improved plastic deformation ability of the matrix. In intercritically reheated CGHAZ (ICCGHAZ), martensite-austenite (M-A) constituents were formed, which consisted of twin martensite and austenite. The decrease in Si content reduced the amount and size of M-A constituents and changed their elongated morphology to blocky morphology, which is also believed to be beneficial for ICCGHAZ cryogenic toughness. This work provides a novel way to soften the HAZ microstructure for improving its cryogenic toughness.
机译：与9％Ni钢相比，低镍钢在成本和可焊性上具有很大的优势。然而，常规低镍钢的热影响区（HAZ）的低温韧性劣化，这限制了其在液化天然气罐的构造中的应用。在这项工作中，设计了两种硅含量不同的低镍钢，并研究了这些钢样品中硅含量与HAZ低温韧性之间的关系。降低Si含量后，在熔合线和熔合线1座客栈的热影响区中获得了所需的夏比冲击吸收能量。显微组织表征表明，Si含量的降低促进了粗晶粒HAZ（CGHAZ）的自回火，从而提高了基体的塑性变形能力。在临界间再加热的CGHAZ（ICCGHAZ）中，形成了由双马氏体和奥氏体组成的马氏体-奥氏体（M-A）成分。 Si含量的减少减少了M-A成分的数量和尺寸，并将其伸长的形态改变为块状形态，这也被认为对ICGGHAZ低温韧性有利。这项工作提供了一种软化HAZ微结构以提高其低温韧性的新颖方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号