• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Influences of Co addition and austenitizing temperature on secondary hardening and impact fracture behavior in P/M high speed steels of W-Mo-Cr-V(-Co) system
【24h】

Influences of Co addition and austenitizing temperature on secondary hardening and impact fracture behavior in P/M high speed steels of W-Mo-Cr-V(-Co) system

机译：钴和奥氏体化温度对W-Mo-Cr-V（-Co）体系P / M高速钢二次硬化和冲击断裂行为的影响

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

The secondary hardening and fracture behavior in P/M high speed steels of W-Mo-Cr-V(-Co) system has been investigated in terms of Co addition and austenitizing temperature. Austenitizing was conducted at 1100 and 1175 ℃ of relatively low and high temperatures, respectively. Tempering was performed in the range of 500-600 ℃. Coarse primary carbides retained after heat treatment were V-rich MC and W-Mo-rich M_6C types. Since the dissolution of W-Mo-rich M_6C with relatively low stability was more promoted with increasing austenitizing temperature, the alloy content of the W and Mo in the matrix was enhanced. In turn, it gives a significant influence on the precipitation of fine secondary alloy carbides, that is, secondary hardening during tempering. The major secondary carbides were W-Mo-Cr-rich M_2C type. The peak hardness was observed in the tempering range of 500-540 ℃, depending on Co addition and austenitizing temperature. With an increase in austenitizing temperature, the aging deceleration was observed. This phenomenon may be attributed to the increased content of W and Mo in the matrix, both diffusing slowly in the matrix and inhibiting growth of M_2C carbide, as compared to Cr. In addition, the aging acceleration occurred in the Co bearing alloy, promoting the precipitation of M_2C carbides, as well as the overall increase in hardness. In general, the impact toughness was decreased with an increase in hardness. In addition, the impact toughness to hardness balance was lowered in the Co bearing alloy.
机译：从添加Co和奥氏体化温度的角度研究了W-Mo-Cr-V（-Co）体系的P / M高速钢的二次硬化和断裂行为。奥氏体化分别在1100和1175℃的相对较低和较高的温度下进行。在500-600℃范围内进行回火。热处理后保留的粗初级碳化物是富V的MC和富W-Mo的M_6C类型。由于随着奥氏体化温度的升高，具有较低稳定性的富含W-Mo的M_6C的溶解得到进一步促进，因此，基体中W和Mo的合金含量得到了提高。反过来，它对精细的二次合金碳化物的析出也具有重要影响，即回火过程中的二次硬化。主要的次生碳化物为富W-Mo-Cr的M_2C型。在500-540℃的回火范围内观察到峰值硬度，这取决于添加的Co和奥氏体化温度。随着奥氏体化温度的升高，观察到时效减速。这种现象可能归因于基体中W和Mo含量的增加，与Cr相比，二者在基体中扩散缓慢并抑制M_2C碳化物的生长。另外，在Co轴承合金中发生了时效加速，从而促进了M_2C碳化物的析出以及整体硬度的增加。通常，冲击韧性随着硬度的增加而降低。另外，含钴合金的冲击韧性至硬度平衡降低。

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