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Title: A study on tensile properties of Alloy 709 at various temperatures

Abstract

In recent years, there have been several advancements in energy production from both fossil fuels and the alternate “clean” sources such as nuclear fission. These advancements are fueled by the need for more efficient systems that will optimize the use of the depleting fossil fuel reserves and shift the focus to cleaner sources of energy. The efficiency of any power generation cycle is dependent on the ability of the structural material to withstand increased peak operating temperatures. Advanced austenitic stainless steels have been in the focus as structural material for the next generation nuclear power plants, due to their strength, corrosion resistance, weldability and the wide range of temperatures at which the austenite phase is stable. Alloy 709, a recently developed advanced austenitic stainless steel, is being investigated in this paper. Here in this study, tensile tests were conducted on dog-bone samples of Alloy 709 in an in-situ scanning electron microscope (SEM) loading and heating stage, equipped with electron backscatter diffraction (EBSD), at various temperatures. The in-situ experiments indicated that the material primarily accommodated deformation by slip at lower temperatures. Void formation and coalescence at grain boundaries preceded slip at higher temperatures. Although crack initiation at all elevated temperatures wasmore » intergranular, the crack propagation through the material and the final fracture was transgranular ductile. Additionally, tensile tests were conducted on larger cylindrical samples at 550, 650 and 750 °C in air. The results of tests conducted in air and in-situ were found to be in agreement, at these temperatures.« less

Authors:
 [1];  [2];  [2];  [1]
  1. North Carolina State University, Raleigh, NC (United States)
  2. University of Birmingham (United Kingdom)
Publication Date:
Research Org.:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); Research Council of United Kingdom (RCUK); USDOE
OSTI Identifier:
1538615
Alternate Identifier(s):
OSTI ID: 1544588
Grant/Contract Number:  
NE0008451; EP/N016351/1; 2015-1877/DE-NE0008451
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 733; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; austenitic stainless steel; alloy 709; Fractography; in-situ scanning electron microscope; electron backscatter diffraction

Citation Formats

Upadhayay, Swathi, Li, Hangyue, Bowen, Paul, and Rabiei, Afsaneh. A study on tensile properties of Alloy 709 at various temperatures. United States: N. p., 2018. Web. doi:10.1016/j.msea.2018.06.089.
Upadhayay, Swathi, Li, Hangyue, Bowen, Paul, & Rabiei, Afsaneh. A study on tensile properties of Alloy 709 at various temperatures. United States. https://doi.org/10.1016/j.msea.2018.06.089
Upadhayay, Swathi, Li, Hangyue, Bowen, Paul, and Rabiei, Afsaneh. 2018. "A study on tensile properties of Alloy 709 at various temperatures". United States. https://doi.org/10.1016/j.msea.2018.06.089. https://www.osti.gov/servlets/purl/1538615.
@article{osti_1538615,
title = {A study on tensile properties of Alloy 709 at various temperatures},
author = {Upadhayay, Swathi and Li, Hangyue and Bowen, Paul and Rabiei, Afsaneh},
abstractNote = {In recent years, there have been several advancements in energy production from both fossil fuels and the alternate “clean” sources such as nuclear fission. These advancements are fueled by the need for more efficient systems that will optimize the use of the depleting fossil fuel reserves and shift the focus to cleaner sources of energy. The efficiency of any power generation cycle is dependent on the ability of the structural material to withstand increased peak operating temperatures. Advanced austenitic stainless steels have been in the focus as structural material for the next generation nuclear power plants, due to their strength, corrosion resistance, weldability and the wide range of temperatures at which the austenite phase is stable. Alloy 709, a recently developed advanced austenitic stainless steel, is being investigated in this paper. Here in this study, tensile tests were conducted on dog-bone samples of Alloy 709 in an in-situ scanning electron microscope (SEM) loading and heating stage, equipped with electron backscatter diffraction (EBSD), at various temperatures. The in-situ experiments indicated that the material primarily accommodated deformation by slip at lower temperatures. Void formation and coalescence at grain boundaries preceded slip at higher temperatures. Although crack initiation at all elevated temperatures was intergranular, the crack propagation through the material and the final fracture was transgranular ductile. Additionally, tensile tests were conducted on larger cylindrical samples at 550, 650 and 750 °C in air. The results of tests conducted in air and in-situ were found to be in agreement, at these temperatures.},
doi = {10.1016/j.msea.2018.06.089},
url = {https://www.osti.gov/biblio/1538615}, journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
issn = {0921-5093},
number = C,
volume = 733,
place = {United States},
year = {Sat Jun 23 00:00:00 EDT 2018},
month = {Sat Jun 23 00:00:00 EDT 2018}
}

Journal Article:

Citation Metrics:
Cited by: 18 works
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Works referenced in this record:

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