• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >High cycle fatigue behaviour of a multiphase microalloyed medium carbon steel: a comparison between ferrite-pearlite and tempered martensite microstructures
【24h】

High cycle fatigue behaviour of a multiphase microalloyed medium carbon steel: a comparison between ferrite-pearlite and tempered martensite microstructures

机译：多相微合金中碳钢的高周疲劳行为：铁素体-珠光体与回火马氏体组织的比较

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

To improve toughness and fatigue strength, a mutiphase (ferrite (F)-bainite (B)-martensite (M)) microstructure was developed in a V-bearing medium carbon microallayed (MA) steel through a two-step cooling process that was followed by an annealing (two-step cooling and annealing (TSCA)) treatment. In the present paper, the high cycle fatigue (HCF) response determined in terms of the endurance limit, long crack fatigue threshold (DELTA K_(th)), crack closure and fatigue crack growth rate (FCGR) in a material that has a multiphase microstructure is presented and compared with those of the same material with a ferrite-pearlite (F-P) and a tempered martensite (T-M) microstructure obtained by air-cooling (AC) and quenching and tempering (Q&T), respectively. Long crack fatigue threshold (DELTA K_(th)) and crack closure were evaluated using a dynamic compliance (DYNACOMP) measurement technique. The fatigue limit of the F-B-M and the T-M microstructures (approx 400 MPa) was greater than that of the F-P microstructure (approx 340 MPa). At load ratios less than 0.5, the threshold for long crack growth was lower for the F-B-M microstructure compared with that of the F-P microstructure. This is attributed to the reduced roughness-induced crack closure (RICC) contribution to the threshold in the former multiphase microstructure. A quantitative analysis of the near-threshold fracture surfaces validated the above conclusion. Fatigue crack growth rate in the Paris regime was found to be independent of the microstructure but dependent on the load ratio.
机译：为了提高韧性和疲劳强度，在V轴承中碳微合金化（MA）钢中通过两步冷却工艺开发了多相（铁素体（F）-贝氏体（B）-马氏体（M））组织。通过退火（两步冷却和退火（TSCA））处理。在本文中，高循环疲劳（HCF）响应由耐久极限，长裂纹疲劳阈值（DEL K_（th）），裂纹闭合和疲劳裂纹扩展速率（FCGR）决定。给出了显微组织并将其与具有铁氧体-珠光体（FP）和回火马氏体（TM）的相同材料的显微组织进行了比较，分别通过空冷（AC）和淬火和回火（Q＆T）获得。使用动态柔度（DYNACOMP）测量技术评估长裂纹疲劳阈值（DELTA K_（th））和裂纹闭合。 F-B-M和T-M微结构的疲劳极限（约400 MPa）大于F-P微结构的疲劳极限（约340 MPa）。当载荷比小于0.5时，与F-P微结构相比，F-B-M微结构的长裂纹扩展阈值较低。这归因于降低的粗糙度诱发的裂纹闭合（RICC）对前者多相微结构中阈值的贡献。对近阈值断裂面的定量分析证实了以上结论。发现巴黎地区的疲劳裂纹扩展速率与微观结构无关，但与载荷比有关。

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