Coarsening behaviour of a Ni-base superalloy under different heat treatment conditions
Coarsening behaviour of a Ni-base superalloy under different heat treatment conditions
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DOI：
10.1016/j.msea.2006.12.107
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发表时间：
2007-06-15
期刊：
影响因子：
6.4
通讯作者：
Palacio, H. A.
中科院分区：
文献类型：
--
作者：
Ges, A. M.;Fornaro, O.;Palacio, H. A.
镍基高温合金用于要求高温强度的应用。这些合金大多是由γ′[Ni-3(Al, Ti)]相在fcc基体中连续析出而沉淀硬化的。在高温下，材料的性能和对微观组织变化的抵抗能力取决于γ′析出物的粒度、粗化速率、分布和体积分数等因素，这些因素可以通过不同的热处理来改变。本文描述了热处理对CMSX-2高温合金中不同γ′析出相尺寸和分布的影响。通过后续的恒温时效处理，研究了这些析出相的演化和生长，并确定了粗化的活化能。(C) 2007 Elsevier B.V.版权所有
Nickel-base superalloys are used in applications requiring strength at high temperatures. Most of these alloys are precipitation hardened by a gamma'[Ni-3(Al, Ti)] phase coherently precipitated in a fcc matrix. The properties and resistance to microstructural changes at high temperatures depend on factors as particle size, coarsening rate, distribution and volume fraction of the gamma' precipitate, factors that can be modified through different heat treatments.The present work describes the effect of heat treatments to produce different gamma' precipitate sizes and distribution in a CMSX-2 superalloy. Using subsequent aging treatment at constant temperature, we studied the evolution and growth of such precipitate particles and determined the activation energy for coarsening. (C) 2007 Elsevier B.V. All rights reserved.