Heat treatment of UDIMET 720Li: the effect of microstructure on properties
Heat treatment of UDIMET 720Li: the effect of microstructure on properties
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DOI：
10.1016/s0921-5093(98)00867-3
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发表时间：
1999-01-15
期刊：
影响因子：
6.4
通讯作者：
Reed, RC
中科院分区：
文献类型：
--
作者：
Jackson, MP;Reed, RC
研究了高强度高温合金UDIMET 720 Li锻态组织在热处理过程中的演变。特别强调了使用光学和透射电子显微镜（TEM）和随后的图像分析对γ沉淀动力学的表征。用热力学，相变和沉淀硬化理论解释的意见。研究结果对燃气涡轮机制造商具有一定的指导意义。通过更好地了解时效过程中微观结构的演变，提出了在700 ℃下热处理24 h的建议，认为这是最佳的。这允许充分利用合金的性质，同时减少与热处理计划相关的成本和时间。此外，所提供的数据允许估计U720Li锻件的性能变化。(C)1999年Elsevier Science S.A. All rights reserved.
The evolution during heat treatment of the as-forged microstructure of the high strength superalloy UDIMET 720Li has been studied. Particular emphasis has been placed on the characterisation of gamma' precipitation kinetics using optical and transmission electron microscopies (TEM) and subsequent image analysis. The observations are interpreted using thermodynamic, phase transformation and precipitate hardening theories. The results have implications for the gas turbine manufacturers. Through a better understanding of the evolution of the microstructure during ageing, a heat treatment of 24 h at 700 degrees C is proposed, which is believed to be optimal. This allows full advantage to be taken of the properties of the ahoy, whilst reducing the costs and time associated with the heat treatment schedules. Moreover, the data presented allows the variation in properties across a U720Li forging to be estimated. (C) 1999 Elsevier Science S.A. All rights reserved.