Understanding the Deformation Behavior of Alumina-Forming Austenitic Stainless Steels

了解形成氧化铝的奥氏体不锈钢的变形行为

基本信息

批准号：
1708091
负责人：
Ian Baker
金额：
$ 51.89万
依托单位：
Dartmouth College
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-07-01 至 2022-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1708091&HistoricalAwards=false
关键词：
Understanding Deformation Behavior Alumina Forming

项目摘要

NON-TECHNICAL SUMMARYEven with the increasing use of renewable energy, the primary energy sources for the foreseeable future for power generation are likely to be fossil fuels. Thus, for economic reasons, it is critical to use these resources as efficiently as possible. Increasing a power plant's operating temperature increases its efficiency. The limiting factor for higher temperature is materials that can operate at higher temperatures, and are economically viable. The aim of this project is to elucidate the deformation mechanisms in alumina-forming austenitic (AFA) stainless steels that are being considered for this application. The work will train both a Ph.D. student and several undergraduates in state of the art techniques.TECHNICAL SUMMARYThe project will ascertain the deformation mechanisms associated with grain boundary (GB) precipitation strengthening, and attempt to understand the fundamental deformation behavior in alloys containing both a precipitate free zone (PFZ) and multiple types of precipitates in both the GBs and the matrix each of which can contribute differently to the deformation behavior. The work will be performed on the model AFA stainless steel Fe-20Cr-30Ni-2Nb-5Al. Detailed microstructural and defect characterization by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) wlll be performed before and after mechanical testing. TEM in-situ straining and SEM in-situ straining studies performed at both room temperature and 750C will examine both dislocation/precipitate and dislocation/GB interactions, including understanding the role of the PFZ along the GBs. The work will train both a Ph.D. student and several undergraduates in state of the art techniques.

非技术摘要即使可再生能源的使用不断增加，在可预见的未来发电的主要能源很可能是化石燃料。因此，出于经济原因，尽可能有效地利用这些资源至关重要。提高发电厂的运行温度可以提高其效率。更高温度的限制因素是可以在更高温度下工作且经济可行的材料。该项目的目的是阐明该应用中考虑的氧化铝形成奥氏体 (AFA) 不锈钢的变形机制。这项工作将培养两位博士生。学生和几名本科生掌握最先进的技术。技术摘要该项目将确定与晶界 (GB) 沉淀强化相关的变形机制，并尝试了解同时含有无沉淀区 (PFZ) 和多重沉淀的合金的基本变形行为。晶界和基体中的析出物类型各自对变形行为的贡献不同。这项工作将在 AFA 型不锈钢 Fe-20Cr-30Ni-2Nb-5Al 上进行。将在机械测试之前和之后通过透射电子显微镜 (TEM) 和扫描电子显微镜 (SEM) 进行详细的微观结构和缺陷表征。在室温和 750C 下进行的 TEM 原位应变和 SEM 原位应变研究将检查位错/沉淀和位错/GB 相互作用，包括了解 PFZ 沿 GB 的作用。这项工作将培养两位博士生。学生和几名本科生掌握最先进的技术。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The formation mechanism, growth, and effect on the mechanical properties of precipitate free zones in the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al during creep

DOI：
10.1016/j.msea.2021.141561
发表时间：
2021-07
期刊：
Materials Science and Engineering: A
影响因子：
0
作者：
A. Peterson;I. Baker
通讯作者：
A. Peterson;I. Baker

Preliminary creep testing of the alumina-forming austenitic stainless steel Fe-20Cr-30Ni-2Nb-5Al

DOI：
10.1016/j.msea.2018.01.090
发表时间：
2018-03-07
期刊：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
影响因子：
6.4
作者：
Baker, Ian;Afonina, Natalie;Wu, Margaret
通讯作者：
Wu, Margaret

Analysis of the elevated temperature deformation mechanisms and grain boundary strengthening of the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al

氧化铝奥氏体不锈钢Fe～20Cr～30Ni～2Nb～5Al高温变形机制及晶界强化分析