...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Microstructural degradation of Gr.91 steel during creep under low stress
【24h】

Microstructural degradation of Gr.91 steel during creep under low stress

机译：低应力蠕变过程中Gr.91钢的显微组织降解

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

Microstructural changes during creep at 600 ℃ under 70 MPa were investigated in the case of interrupted Gr.91 steel samples by taking into account the dislocation structure and Z-phase formation. The creep life monotonically increased with a decrease in the applied stress at each temperature considered in the study. However, the long-term creep life was shorter than that determined from the short-term creep data at 600 ℃ and 650 ℃, meaning premature failure. The subgrain size gradually increased during creep up to 70,000 h, after which rapid subgrain coarsening occurred. Preferential recovery of the subgrain structure occurred around the prior-austenite grain boundary (PAGB) after 50,000 h and 70,000 h. After creep rupture, subgrain recovery was observed over the entire area of each sample. Z-phase formation was clearly visible for 30,000 h after creep. The number density of the MX particles gradually decreased after 30,000 h because of Z-phase formation. After creep rupture, the number density of the MX particles was almost the same as that of the Z-phase particles. During creep, the V content of the Z-phase gradually increased but the Nb content decreased. Changes in the chemical composition of the Z-phase occurred after a longer time in Gr.91 steel than in 12Cr steel.
机译：考虑到位错结构和Z相的形成，研究了Gr.91钢断续情况下600℃70 MPa下蠕变时的组织变化。在研究中考虑的每个温度下，蠕变寿命随着施加应力的减少而单调增加。然而，长期蠕变寿命要比根据短期蠕变数据在600℃和650℃所确定的寿命要短，这意味着过早失效。在蠕变直至70,000 h时，亚晶粒尺寸逐渐增大，此后发生了快速的亚晶粒粗化。在50,000h和70,000h之后，在奥氏体前晶界（PAGB）周围发生了亚晶粒结构的优先恢复。蠕变破裂后，在每个样品的整个区域观察到亚晶粒恢复。 Z相形成在蠕变后30,000小时内清晰可见。 30,000小时后，由于Z相的形成，MX粒子的数量密度逐渐降低。蠕变断裂后，MX粒子的数量密度与Z相粒子的数量密度几乎相同。在蠕变期间，Z相的V含量逐渐增加，而Nb含量下降。与12Cr钢相比，Gr.91钢中Z相化学成分的变化发生的时间更长。

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