• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Microstructural evolution mechanisms in rolled 17-4PH steel processed by ultrasonic surface rolling process
【24h】

Microstructural evolution mechanisms in rolled 17-4PH steel processed by ultrasonic surface rolling process

机译：超声表面轧制工艺对17-4PH轧制钢的组织演变机理

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

The surface of rolled 17-4 precipitation-hardening steel was subjected to the ultrasonic surface rolling process technique at room temperature. Microstructural evolution mechanisms and its intrinsic relation with processing history, namely formation process and heat treatment, were systematically analyzed via high-resolution transmission electron microscopy. The results indicated that a gradient nanocrystalline structure layer was generated at the surface, where a nanocrystalline and amorphous transitional microstructure formed on the topmost layer. The paramount role of dislocation activities in the nanocrystallization process was investigated in detail. It was found that the precipitates was also surrounded and sheared by dislocations into smaller size, which then dissolved in the matrix. Meanwhile, a phase transformation from martensite to 8-ferrite occurred in the processed surface, and superlattice and elemental redistribution or/and realignment phenomena appeared. The reason for these was that high grain boundary density provided "short circuit diffusion" channels, which raised the number of enrichment sites and enhanced the diffusion kinetics, and high dislocation density acted as fast paths, thus accelerating atomic diffusion.
机译：在室温下对轧制的17-4沉淀硬化钢的表面进行超声表面轧制工艺技术。通过高分辨率透射电子显微镜系统地分析了微观结构的演化机理及其与加工历史（即形成过程和热处理）的内在联系。结果表明，在表面上产生了梯度的纳米晶体结构层，其中在最顶层上形成了纳米晶体和非晶态的过渡微观结构。详细研究了位错活性在纳米结晶过程中的重要作用。发现沉淀物也被位错包围并剪切成较小的尺寸，然后溶解在基质中。同时，在加工后的表面发生了从马氏体到8铁素体的相变，并且出现了超晶格和元素的重新分布或/和重新排列现象。其原因是，高晶界密度提供了“短路扩散”通道，从而增加了富集位点的数量并增强了扩散动力学，而高位错密度充当了快速路径，从而促进了原子扩散。

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