Verification of a Commercial CALPHAD Database for Re and Ru Containing Nickel-Base Superalloys
Verification of a Commercial CALPHAD Database for Re and Ru Containing Nickel-Base Superalloys
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含镍基高温合金 Re 和 Ru 的商用 CALPHAD 数据库验证
DOI：
10.4028/www.scientific.net/ddf.289-292.101
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发表时间：
2009
影响因子：
--
通讯作者：
R. Singer
中科院分区：
文献类型：
--
作者：
R. Rettig;A. Heckl;S. Neumeier;F. Pyczak;M. Göken;R. Singer
在单晶镍基高温合金中加入铼和钌可以改善合金的高温性能。本文研究了数据库TTNi7 （ThermoTech Ltd， UK）在开发第四代含铼（Re）和钌（Ru）单晶高温合金中的适用性。我们系统地将实验确定的合金性能与ThermoCalc与数据库TTNi7的预测进行了比较。研究的性质是液相、固相和溶剂温度以及初熔点和偏析。计算基于热力学原理，假设平衡或沙伊尔-格列佛条件，即在固体中没有扩散，在液体中完全扩散。此外，还测量了含Re和ru的高温合金和相的组成，并与计算结果进行了比较。结果表明，该数据库能够模拟第四代高温合金的总体趋势，稀土和Ru的重量分别达到6% （wt.-%）和6% （wt.-%）。目前的工作表明，Scheil-Gulliver计算只能用作镍基高温合金的第一近似。
The addition of rhenium and ruthenium to single crystal nickel-base superalloys improves the high-temperature properties of the alloys. In this work the applicability of the database TTNi7 (ThermoTech Ltd, UK) for developing 4th generation single crystal superalloys containing rhenium (Re) and ruthenium (Ru) was investigated. We systematically compared experimentally determined alloy properties to the predictions of ThermoCalc with the database TTNi7. The investigated properties were liquidus, solidus and ´ solvus temperature as well as incipient melting point and segregation. Calculations were based on thermodynamic principles with the assumption of either equilibrium or Scheil-Gulliver conditions, i.e. no diffusion in the solid and complete diffusion in the liquid. Furthermore the composition of the and the phase of a Re- and Ru-containing superalloy was measured and compared to calculations. Our results show that the database is capable of simulating general trends of 4th generation superalloys up to 6 weight percent (wt.-%) Re and 6 wt.-% Ru. The present work shows that Scheil-Gulliver calculations can only be used as a first approximation for nickel-base superalloys.