• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.2; Jul 7-11, 2003; Leganes, Madrid, Spain >Influence of heat treatment on fatigue behavior of a Cu-Ni alloyed austempered ductile iron
【24h】

Influence of heat treatment on fatigue behavior of a Cu-Ni alloyed austempered ductile iron

机译：热处理对Cu-Ni合金奥氏体球墨铸铁疲劳性能的影响

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

Vibrational uniaxial fatigue measurements are reported for an austempered ductile iron containing 3.4 wt.% C, 2.78 wt.% Si, 0.44 wt.% Cu, 0.61 wt.% Ni, 0.2 wt.% Mo, and 0.21 wt.% Mn. The iron was austenitized at 875℃ and then austempered at 260, 285, 320, 365 and 400℃ for 1.5 hours to obtain various austempered microstructures. X-Ray diffraction was used to measure the amount of high carbon austenite and its carbon content. It is shown that fatigue strength increases as the amount of high carbon austenite increases. The highest fatigue strength is obtained with an ausferrite structure which has austempered at 365℃. This behavior is related to the volume of high carbon austenite and ferrite needle width. Fatigue cracks are arrested by ferrite needle boundaries. By increasing the austempering temperature the austenite volume increases and the possibility of crack propagation decreases from the surface of samples. This is related to the TRIP mechanism that produces martensite on the surface of samples. The ferrite needle width increases as the austempering temperature increases. These two effects change the fatigue limit in opposite directions. This behavior will create a situation that an optimum would be observed at an intermediate austempering temperature.
机译：报道了含3.4重量％的C，2.78重量％的Si，0.44重量％的Cu，0.61重量％的Ni，0.2重量％的Mo和0.21重量％的Mn的奥氏体球墨铸铁的振动单轴疲劳测量。将铁在875℃下奥氏体化，然后在260、285、320、365和400℃下奥氏体化1.5小时，以获得各种奥氏体组织。 X射线衍射用于测量高碳奥氏体的量及其碳含量。结果表明，疲劳强度随着高碳奥氏体量的增加而增加。奥氏体组织在365℃的温度下得到了最高的疲劳强度。此行为与高碳奥氏体的体积和铁素体针的宽度有关。疲劳裂纹被铁氧体针边界阻止。通过提高奥氏体化温度，奥氏体体积增加，裂纹从样品表面扩散的可能性降低。这与在样品表面产生马氏体的TRIP机理有关。随着奥氏体温度的升高，铁氧体针的宽度增加。这两种作用会沿相反的方向改变疲劳极限。这种行为将导致在中间的回火温度下观察到最佳状态。

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