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Hydrogen Microprint Analysis on the Effect of Dislocations on Grain Boundary Hydrogen Distribution in Steels

机译：氢显微照片分析，位错对钢中晶界氢分布的影响

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摘要

Hydrogen related intergranular fracture in high strength steels and steel welds are often explained by the hydrogen segregation at grain boundary that induces decohesion of the boundary. In this study, distribution of hydrogen in the grain boundary was visualized by a hydrogen microprint technique (HMT), and the effect of dislocations on hydrogen distribution in steel was analyzed. 0.02%C steel with ferrite micro-structure was subjected to a plastic deformation up to 20% and HMT analysis, and then quantitative analysis of hydrogen concentration was conducted by measuring the area of silver particles formed by the reductive reaction between AgBr and hydrogen. The grain boundary hydrogen density was defined by an area of silver particle at the grain boundary per unit grain boundary length and diffusible hydrogen charged. And, it was found that the grain boundary hydrogen density decreases with increasing prestrain since hydrogen is trapped by dislocations inside the grain. The effect of dislocations introduced by mar-tensitic transformation was also investigated using 0.1%C steels in as-quenched and quenched and tempered conditions. Silver particles were mainly observed on lath boundary in the as-quenched condition, while hydrogen density at the prior austenite boundary increased after tempering. It can be said that hydrogen segregation at the prior austenite grain boundary is affected by dislocations and lath boundary in martensite microstructure. Effect of dislocations on hydrogen distribution was also discussed based on dislocation densities and hydrogen contents.
机译：高强度钢和钢焊缝中与氢有关的晶间断裂通常由晶界处的氢偏析引起，该偏析引起边界的解聚。在这项研究中，通过氢显微照片技术（HMT）观察了晶界中氢的分布，并分析了位错对钢中氢分布的影响。对具有铁素体微结构的0.02％C钢进行20％的塑性变形并进行HMT分析，然后通过测量由AgBr与氢之间的还原反应形成的银颗粒的面积进行氢浓度的定量分析。晶界氢密度由每单位晶界长度在晶界处的银颗粒的面积和扩散的氢所限定。并且，发现晶界氢密度随着预应变的增加而降低，因为氢被晶粒内部的位错捕获。还使用了0.1％C的钢在淬火和调质条件下研究了由马氏体相变引入的位错的影响。在淬火条件下，主要在板条边界观察到银颗粒，而回火后，在先前奥氏体边界的氢密度增加。可以说，马氏体组织中的位错和板条边界对原奥氏体晶界处的氢偏析有影响。还根据位错密度和氢含量讨论了位错对氢分布的影响。

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  • 来源
    《ISIJ international》 |2016年第3期|413-417|共5页
  • 作者

    Nobuyuki ISHIKAWA; Hitoshi SUEYOSHI; Akihide NAGAO;

  • 作者单位

    Steel Research Laboratory, JFE Steel Corporation, 1-1 Minamiwatarida-cho, Kawasaki-ku, Kawasaki, 210-0855 Japan;

    Intellectual Property Department, JFE Steel Corporation, 2-2-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo, 100-0011 Japan;

    Steel Research Laboratory, JFE Steel Corporation, 1-1 Minamiwatarida-cho, Kawasaki-ku, Kawasaki, 210-0855 Japan ,International Institute for Carbon-Neutral Energy Research (WPI-I~2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395 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

    hydrogen microprint technique; thermal desorption analysis; ferrite; martensite; dislocation; grain boundary;

    机译：氢微印技术;热脱附分析;铁氧体马氏体错位;晶界;

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