...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Inter-Relationships between Composition, gamma' Morphology, Hardness, and gamma-gamma' Mismatch in Advanced Polycrystalline Nickel-Base Superalloys during Aging at 800 deg C
【24h】

Inter-Relationships between Composition, gamma' Morphology, Hardness, and gamma-gamma' Mismatch in Advanced Polycrystalline Nickel-Base Superalloys during Aging at 800 deg C

机译：800摄氏度时效时先进多晶镍基高温合金的成分，γ'形态，硬度和γ-γ不匹配之间的相互关系

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

In this article, two established nickel-based superalloys, Udimet 720 and RR1000, and a further experimental alloy, UC01, were studied in terms of their response to aging at 800 deg C. The alloys were subject to a solution treatment above their gamma-gamma' solvus temperature to dissolve all gamma' before cooling at either a slow "billet" or a more complex and faster two-step "intermediate" cooling rate. The effect of alloy composition and cooling rate on gamma' morphology, alloy hardness, and gamma-gamma' mismatch was studied. When cooling at a slow billet rate, all alloys followed the LSW theory for precipitate coarsening. This resulted irl increasing precipitate size with increasing time, a peak hardness associated with a specific precipitate size, and increasing gamma-gamma' mismatch with time. When subjected to a two-step cooling rate, complex morphological changes were observed for intragranular gamma' in RR1000 and alloy UC01. This was manifested by variations in hardness, gamma-gamma' mismatch, and the elastic and unconstrained misfit strain within the system. These variations are ascribed to the presence of tantalum within both RR1000 and alloy UC01, which is slow to diffuse to the growing gamma' precipitates during cooling and drives the morphological instability during subsequent aging at 800 deg C.
机译：在本文中，研究了两种已建立的镍基高温合金Udimet 720和RR1000，以及另一种实验合金UC01，它们对800℃时效的响应。 γ'固溶温度，以溶解所有γ'，然后以缓慢的“坯料”或更复杂和更快的两步“中间”冷却速率冷却。研究了合金组成和冷却速率对γ'形貌，合金硬度和γ-γ'失配的影响。当以较低的坯料速率冷却时，所有合金均遵循LSW理论进行沉淀粗化。这导致沉淀物尺寸随时间增加而增加，与特定沉淀物尺寸相关的峰值硬度以及随时间增加的γ-γ'不匹配。当经历两步冷却速率时，在RR1000和合金UC01中观察到了颗粒内γ'的复杂形态变化。这通过硬度，伽马-伽马失配以及系统内弹性和不受约束的失配应变的变化来证明。这些变化归因于RR1000和UC01合金中都存在钽，钽在冷却过程中缓慢扩散到生长的γ'沉淀中，并在随后于800℃时效时驱动形貌不稳定性。

著录项

相似文献

  • 外文文献
  • 中文文献
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