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Thermomechanically induced precipitation of intermetallic phases in heat resisting ferritic steels

耐热铁素体钢中热机械诱导金属间相的析出

基本信息

批准号：
314367510
负责人：
Professor Dr.-Ing. Wolfgang Bleck
金额：
--
依托单位：
Institut für Eisenhüttenkunde (IEHK)
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/314367510?language=en
关键词：
Thermomechanically induced precipitation intermetallic phases

项目摘要

The objective is to develop new ferritic steels together with its manufacturing process, which shows high resistance to creep, thermomechanical fatigue and oxidation. Therefore the influence of a thermomechanical treatment on precipitation of Laves phase will be investigated in steel grades with chromium contents between 15 and 20 wt.-%. One challenge is to control the chemistry and morphology of the Laves phase as well as the precipitation of carbonitrides and avoid at the same time the formation of sigma-phase. For this purpose a computer-aided optimization of the alloy will be performed, which intends to get a high volume fraction of the Laves phase. Thermodynamic modelling helps to increase the tungsten content in solid solution and reduces the amount of carbonitrides. The developed alloys will be manufactured in an laboratory scale and analyzed in further steps. The thermomechanical processing of this steel will be derived from thermodynamic modelling and its validation with experimental results. One major issue is the investigation of the temperature-sensitive mechanical properties which will be compared with the state of the art. A further important aspect is the quantitative description of the relationship between thermomechanical treatment and precipitation of the Laves phase. Thus the influence of the thermomechanical treatment on the microstructure and mechanical properties will be analyzed. In the focus is also the effect of precipitation kinetics and morphology of the precipitated particles. This project will establish a fundamental understanding of the correlation between alloying elements, microstructure, deformation structure, precipitations and mechanical properties of a new ferritic alloy concept.

目的是开发新的铁素体钢及其制造工艺，使其具有高的抗蠕变、热机械疲劳和氧化性能。因此，在铬含量在15-20wt.-%之间的钢种中，将研究形变处理对Laves相析出的影响。一个挑战是控制Laves相的化学和形貌以及碳氮化物的析出，同时避免Sigma相的形成。为此，将对合金进行计算机辅助优化，以获得高体积分数的Laves相。热力学模拟有助于增加固溶体中的钨含量，减少碳氮化物的数量。开发的合金将在实验室规模上制造，并在进一步的步骤中进行分析。该钢的形变过程将通过热力学模型和实验结果进行验证。其中一个主要问题是研究对温度敏感的机械性能，并将其与最先进的技术进行比较。另一个重要方面是定量描述热机械处理与Laves相析出之间的关系。从而分析了形变热处理对组织和力学性能的影响。重点研究了析出动力学和析出粒子形态的影响。该项目将对合金元素、显微组织、变形结构、析出物和机械性能之间的关系建立一个新的铁素体合金概念。