• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on The Mechanical Behavior of Materials; 20070527-31; Busan(KR) >Deformation behaviour and ultrafine grained structure development in steels with different carbon content subjected to severe plastic deformation
【24h】

Deformation behaviour and ultrafine grained structure development in steels with different carbon content subjected to severe plastic deformation

机译：碳含量不同的钢在严重塑性变形下的变形行为和超细晶组织发展

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 article focuses on the results from recent experimental of severe plastic deformation of low carbon (LC) steel and medium carbon (MC) steel performed at increased temperatures. The grain refinement of ferrite respectively ferrite-pearlite structure is described. While LC steel was deformed by ECAP die (e = 3) with a channel angle φ = 90° the ECAP severe deformation of MC steel was conducted with die channel angle of 120° (ε = 2.6 - 4). The high straining in LC steel resulted in extensively elongated ferrite grains with dense dislocation network and randomly recovered and polygonized structure was observed. The small period of work hardening appeared at tensile deformation. On the other side, the warm ECAP deformation of MC steel in dependence of increased effective strain resulted in more progressive recovery process. In interior of the elongated ferrite grains the subgrain structure prevails with dislocation network. As straining increases the dynamic polygonization and recrystallization became active to form mixture of polygonized subgrain and submicrocrystalline structure. The straining and moderate ECAP temperature caused the cementite lamellae fragmentation and spheroidzation as number of passes increased. The tensile behaviour of the both steels was characterized by strength increase however the absence of strain hardening was found at low carbon steel. The favourable effect of ferrite-pearlite structure modification due straining was reason for extended work hardening period observed at MC steel.
机译：本文重点介绍了在升高的温度下对低碳（LC）钢和中碳（MC）钢进行严重塑性变形的最新实验结果。描述了铁素体或铁素体-珠光体组织的晶粒细化。当LC钢通过ECAP模具（e = 3）以通道角φ= 90°变形时，MC的ECAP严重变形是通过120°模具通道角（ε= 2.6-4）进​​行的。 LC钢中的高应变导致粗大的拉长铁素体晶粒，具有密集的位错网络，并且随机回收并观察到多边形结构。少量的工作硬化出现在拉伸变形时。另一方面，MC钢的热ECAP变形取决于有效应变的增加，导致恢复过程更加渐进。在拉长的铁素体晶粒内部，亚晶粒结构以位错网络为主。随着应变的增加，动态多边形化和重结晶变得活跃，从而形成了多边形亚晶和亚微晶结构的混合物。随着通过次数的增加，应变和适中的ECAP温度导致渗碳体薄片破碎和球化。两种钢的拉伸性能都以强度增加为特征，但是在低碳钢中却没有应变硬化。由于应变引起的铁素体-珠光体组织变质的有利影响是在MC钢上观察到延长的加工硬化时间的原因。

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