Fundamental characterization of novel Mo-Si-B-Ti-alloys at ultra-high temperatures

超高温下新型Mo-Si-B-Ti合金的基本表征

• 批准号: 236295902
• 负责人: Professor Dr.-Ing. Hans Jürgen Christ
• 金额: --
• 依托单位: Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/236295902?language=en
• 关键词: Fundamental; characterization; novel; Mo; Si

The aim of the intended research project is the development of new, structural Mo-Si-B-based alloys with improved properties for application temperatures up to 1300°C. In the course of the first funding period we succeeded in the alloy development to broaden significantly the ternary Moss-T1-T2 phase field in the Mo-Si-B-Ti system with small amounts of Fe. We produced for the first time ternary alloys containing the (Mo,Ti)5Si3 phase with excellent oxidation resistance at 750-1300°C. The catastrophically oxidizing (Mo,Ti)3Si phase could be avoided utilizing the arc-metallurgical processing route. It was found that Mo-Si-B-Ti-alloys outplay both the Mo-Si-B alloys and the Ni-based singly crystal alloys with respect to mechanical, i.e. creep, properties. Regarding the high temperature oxidation behaviour fundamental knowledge for the specific adjustment of a protective SiO2-TiO2-duplex layer has been gained due to the fruitful cooperation of the both institutions KIT and USiegen. In addition, sufficient experimental data have been collected for a sound, realistic simulation of inner and outer oxidation processes which will serve as an important tool for the exploitation of the existing potential of Mo-Si-B-Ti-Fe alloys. Greatest endeavor of the present proposal will be the determination of the chemical composition of technically applicable Mo-Si-B-Ti-Fe alloys. Main emphasis will be placed on the impact of the observed Ti-silicides on the already excellent mechanical properties and the intrinsic oxidation resistance. This implies the extensive characterization of the microstructure, the nature/effect of the Ti-silicide precipitates on the deformation behaviour of the solid solution phase and the isothermal/cyclic oxidation resistance of Mo-Si-B-Ti-Fe alloys. To enable an efficient development cycle, the evaluation of the alloy compositions with an improved balance of mechanical and oxidative properties should occur by the interplay between mechanism-based simulation and experimental results. The assessment of the oxidation process of different Mo-Si-B-Ti-Fe alloys has to be performed dependent on the temperature, the microstructure and the chemical composition using a FEM model considering the real microstructure by embedding spatially- and time-resolved kinetic calculations as well as local thermodynamic equilibrium calculations. Selected compositions with simulation based predicted property improvement shall be produced and investigated to verify the simulation model.

该研究项目的目标是开发新的结构Mo-Si-B基合金，其应用温度高达1300°C。在第一个资助期内，我们成功地开发了合金，显着拓宽了含有少量Fe的Mo-Si-B-Ti系统中的三元Moss-T1-T2相区。我们首次生产出含有（Mo，Ti）5Si 3相的三元合金，在750-1300°C下具有优异的抗氧化性。利用电弧冶金工艺路线可以避免灾难性氧化的（Mo，Ti）3Si相。发现Mo-Si-B-Ti合金在机械性能（即蠕变性能）方面优于Mo-Si-B合金和Ni基单晶合金。由于KIT和USiegen这两个机构的富有成效的合作，已经获得了关于高温氧化行为的基本知识，用于保护性SiO2-TiO 2-双相层的具体调整。此外，还收集了足够的实验数据，对内部和外部氧化过程进行了合理、真实的模拟，这将成为开发Mo-Si-B-Ti-Fe合金现有潜力的重要工具。本建议的最大奋进将是确定技术上适用的Mo-Si-B-Ti-Fe合金的化学成分。主要重点将放在已经优异的机械性能和固有的抗氧化性上观察到的钛硅化物的影响。这意味着微观结构的广泛表征，钛硅化物沉淀物对固溶体相的变形行为和Mo-Si-B-Ti-Fe合金的等温/循环抗氧化性的性质/影响。为了实现有效的开发周期，应通过基于机制的模拟和实验结果之间的相互作用来评估具有改善的机械和氧化性能平衡的合金组合物。不同Mo-Si-B-Ti-Fe合金的氧化过程的评估必须依赖于温度、显微组织和化学成分，使用考虑真实的显微组织的FEM模型，通过嵌入空间和时间分辨的动力学计算以及局部热力学平衡计算来进行。应生产和研究具有基于模拟的预测性能改进的选定组合物，以验证模拟模型。

项目成果

Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti)5Si3

• DOI: 10.1016/j.intermet.2017.05.023
• 发表时间: 2017-11
• 期刊: Intermetallics
• 影响因子: 4.4
• 作者: M. Azim;B. Gorr;H. Christ;Olena Lenchuk;K. Albe;D. Schliephake;M. Heilmaier

Effect of Ti addition on the thermal expansion anisotropy of Mo5Si3

• DOI: 10.1016/j.actamat.2017.02.066
• 发表时间: 2017-06
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: M. Azim;H. Christ;B. Gorr;T. Kowald;Olena Lenchuk;K. Albe;M. Heilmaier

High-temperature oxidation behavior of Mo–Si–B-based and Co–Re–Cr-based alloys

MoâSiâB基和CoâReâCr基合金的高温氧化行为

• DOI: 10.1016/j.intermet.2013.10.008
• 发表时间: 2014
• 期刊: Intermetallics
• 影响因子: 4.4
• 作者: B. Gorr;L. Wang;S. Burk;M. Azim;S. Majumdar;H.-J. Christ;D. Schliephake;M. Heilmaier
• 通讯作者: M. Heilmaier

Characterization of Oxidation Kinetics of Mo–Si–B-Based Materials

• DOI: 10.1007/s11085-016-9659-3
• 发表时间: 2017-02
• 期刊: Oxidation of Metals
• 影响因子: 2.2
• 作者: M. Azim;B. Gorr;H. Christ;M. Heilmaier;U. Koch;M. Engelhard

High-Temperature Creep and Oxidation Behavior of Mo-Si-B Alloys with High Ti Contents

• DOI: 10.1007/s11661-013-1944-z
• 发表时间: 2013
• 期刊: Metallurgical and Materials Transactions A
• 作者: D. Schliephake;M. Azim;K. Klinski-Wetzel;B. Gorr;H. Christ;H. Bei;E. George;M. Heilmaier