Heat-resistant austenitic steels as matrix materials for wear applications above 400°C

耐热奥氏体钢作为基体材料，适用于 400°C 以上的磨损应用

• 批准号: 319959745
• 负责人: Professor Dr.-Ing. Werner Theisen
• 金额: --
• 依托单位: Lehrstuhl Werkstoffwissenschaft
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319959745?language=en
• 关键词: Heat; resistant; austenitic; steels; matrix

The mechanisms and factors of high-temperature abrasive wear differ from those of ambient temperature wear. Required high-temperature properties of metals are high-temperature strength and hot-hardness, plastic deformability and hardening ability. These requirements apply, in the field of multiphase materials, primarily to the metal-matrix. The stability of a materials high-temperature wear behavior is mainly determined by the matrix properties. The wear resistance of the metal-matrix itself, as well as the support and integration of hard phases by the metal-matrix are relevant. Austenitic steels are possible Fe-based matrix-materials with increased resistance to high-temperature wear. Especially austenitic steels with a low stacking fault energy (SFE) and a low temperature-dependent increase of the SFE are advantageous for high-temperature abrasive wear applications. The ambition of this research project is to extend the consideration of high-temperature wear of FeCrNi-base alloys to the role of interstitial alloying elements, precipitates, and tribologically induced phase transformations. The interstitial elements C and N have a significant impact on the mechanical properties of austenitic steels. By producing and examining different single-phase FeCrNi(C)N-alloys, the influence of C and N on the metal physical and tribological properties at elevated temperatures should be investigated. In addition, concepts for the precipitation hardening of austenitic steels should be elaborated, to further increase the high-temperature wear resistance. Dispersed precipitates can hinder dislocation movement by acting as obstacles for dislocation slip and thereby contribute to the strengthening of the material. To prove the effect of precipitation hardening on the wear behavior, FeCrNi(C)N-base alloys that allow the precipitation of carbides, nitrides as well as carbonitrides, will be developed. High-temperature wear tests should then elucidate the influence of precipitation hardening on the high-temperature abrasive wear resistance, as well as on the occurring wear mechanisms. Furthermore, deformation-induced phase transformations of the austenitic lattice in the tribologically affected zone, are taken into account. Thereby it should be investigated under what conditions phase transformations occur during abrasive wear and how phase transformations influence the wear behavior.The overarching aim of the project is to gain fundamental understanding of the role of interstitial alloying elements and secondary phases on the tibological behavior in the system of FeCrNi-base alloys and to develop an alloy concept that is customized for high-temperature abrasive wear.

高温磨料磨损的机制和因子与环境温度磨损的磨损不同。金属所需的高温特性是高温强度和热力，塑性可变形性和硬化能力。这些要求适用于多相材料领域，主要用于金属矩阵。高温磨损行为的材料的稳定性主要取决于基质特性。金属矩阵本身的耐磨性以及金属垫子对硬质相的支撑和整合是相关的。奥氏体钢可能是基于Fe的基质材料，具有对高温磨损的耐药性。特别是堆叠断层能量（SFE）和SFE温度较低的堆叠断层能量（SFE）的奥氏体钢对高温磨料磨损应用有利。该研究项目的野心是将Fecrni碱合金的高温磨损扩展到间质合金元素，沉淀和摩擦学诱导的相变的作用。间质元素C和N对奥氏体钢的机械性能有重大影响。通过产生和检查不同的单相FECRNI（C）N合金，应研究C和N对温度升高的金属物理和摩擦学性质的影响。此外，应详细阐述用于降水硬化的降水量硬化的概念，以进一步提高高温耐磨性。分散的沉淀物可以通过充当脱位滑移的障碍，从而阻碍脱位运动，从而有助于加强材料。为了证明降水硬化对磨损行为的影响，将开发允许碳化物，氮化物和碳依抗降水的Fecrni（C）N碱合金。然后，高温磨损试验应阐明降水硬化对高温磨损耐药性以及发生的磨损机构的影响。此外，考虑到摩擦学影响区的奥氏体晶格的变形诱导的相变。因此，应在磨料磨损期间发生什么情况，以及相位转换如何影响磨损行为。该项目的总体目的是对植层合金元素和二级相对植物学在Fecrni基碱基合金系统中的作用的基本了解，并开发出对高型磨料的自定义磨损。