...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Surface & Coatings Technology >Correlation between the surface coverage of severe shot peening and surface microstructural evolutions in AISI 321: A TEM, FE-SEM and GI-XRD study
【24h】

Correlation between the surface coverage of severe shot peening and surface microstructural evolutions in AISI 321: A TEM, FE-SEM and GI-XRD study

机译：AISI 321中严重射击喷丸和表面微观结构演进的表面覆盖的相关性：TEM，FE-SEM和GI-XRD研究

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

AbstractSevere shot peening (SSP) as a surface severe plastic deformation (S2PD) process over a wide range of coverages was applied to generate gradient microstructures with the grain size increasing from nanometer- and micron-scale to initial grain size on the surface layers of 321 stainless steel. The microstructural evolutions including the grain size distribution and phase transformation were systematically investigated in-depth for different surface coverages. GI-XRD, FE-SEM and TEM techniques were used to reveal the microstructure modification mechanisms as a function of the surface coverage. Experimental results show that dislocation slip plays a key role in the grain refinement of this alloy so that with increasing the surface coverage, different structures including dislocation walls, dislocation tangles, and lamella-shaped cells sequentially appear in the initial coarse grains. The results confirmed that these dense dislocation structures during ultrahigh plastic deformation produce ultrafine- (115–192nm) and nano-grains (68–82nm) to minimize the total energy of the system. In line with the grain refinement, the γ (austenite)→α′(straininduced martensite) phase transformation is more affected as the plastic strain increases. So that the volume fraction of α′phase increases to 58.4% for ultrahigh strains. Gradient variation of microhardness with the depth was also obtained for various samples.
机译：<！[cdata [ 抽象 严重喷丸（SSP），其为表面严重的塑性变形（S 2 pd）在各种覆盖范围内的过程应用于产生梯度微结构，晶粒尺寸从纳米和微米尺寸增加到321个不锈钢的表面层上的初始粒度。系统地对不同的表面覆盖进行了深入的深度深入化了包括晶粒尺寸分布和相变的微观结构的进化。 GI-XRD，Fe-SEM和TEM技术用于揭示作为表面覆盖的函数的微观结构改性机制。实验结果表明，位错滑移起着在该合金的晶粒细化了关键作用，使得具有增大表面覆盖率，不同结构，包括位错墙，位错缠结，并且薄片形状的细胞顺序地出现在初始粗粮。结果证实，在超高塑性变形产生这些错位致密结构特细（115-192nm）和纳米颗粒（68-82nm），以尽量减少系统的总能量。符合晶粒细化，γ（奥氏体）→α“（损伤的马氏体）相变，随着塑性应变的增加，更受影响。因此，α'相的体积分数增加到超高菌株的58.4％。对于各种样品，还获得了深度与深度的微硬度的梯度变化。

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