• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >High-cycle fatigue behavior of ultrafine-grained austenitic stainless and TWIP steels
【24h】

High-cycle fatigue behavior of ultrafine-grained austenitic stainless and TWIP steels

机译：超细奥氏体不锈钢和TWIP钢的高周疲劳行为

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

High-cycle fatigue behavior of ultrafine-grained (UFG) 17Cr-7Ni Type 301LN austenitic stainless and high-Mn Fe-22Mn-0.6C TWIP steels were investigated in a reversed plane bending fatigue and compared to the behavior of steels with conventional coarse grain (CG) size. Optical, scanning and transmission electron microscopy were used to examine fatigue damage mechanisms. Testing showed that the fatigue limits leading to fatigue life beyond 4 x 106 cycles were about 630 MPa for 301 LN while being 560 MPa for TWIP steel, and being 0.59 and 0.5 of the tensile strength respectively. The CG counterparts were measured to have the fatigue limits of 350 and 400 MPa. The primary damage caused by fatigue took place by grain boundary cracking in UFG 301 LN, while slip band cracking occurred in CG 301 LN. However, in the case of TWIP steel, the fatigue damage mechanism is similar in spite of the grain size. In the course of cycling neither the formation of a martensite structure nor mechanical twinning occurs, but intense slip bands are created with extrusions and intrusions. Fatigue crack initiates preferentially on grain and twin boundaries, and especially in the intersection sites of slip bands and boundaries.
机译：研究了超细晶粒（UFG）17Cr-7Ni 301LN奥氏体不锈钢和高Mn Fe-22Mn-0.6C TWIP钢在反向平面弯曲疲劳中的高周疲劳行为，并将其与常规粗晶粒钢的行为进行了比较（CG）大小。使用光学，扫描和透射电子显微镜检查疲劳损伤机理。测试表明，导致疲劳寿命超过4 x 106循环的疲劳极限，对于301 LN约为630 MPa，而对于TWIP钢则为560 MPa，抗拉强度分别为0.59和0.5。测得的CG对应疲劳极限为350和400 MPa。疲劳引起的主要破坏是UFG 301 LN中的晶界裂纹，而CG 301 LN中出现了滑带裂纹。但是，在TWIP钢的情况下，尽管有晶粒尺寸，但疲劳损伤机理相似。在循环过程中，既不会形成马氏体结构，也不会发生机械孪生，但随着挤压和侵入会产生强烈的滑移带。疲劳裂纹优先在晶粒和孪晶边界上产生，特别是在滑带和边界的交点处。

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