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Title: Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys

Abstract

Laves phase-reinforced alloys have shown some preliminary promising performance at room temperatures. This paper aims at evaluating mechanical properties of Laves phase-strengthened alloys at elevated temperatures. Three Fe-Cr-Zr alloys were designed to favor the formation of eutectic microstructures containing Laves and body-centered cubic phases with the aid of thermodynamic calculations. Microstructural characterization was carried out on the alloys in as-processed and aged states using optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The effect of thermal aging and alloy composition on microstructure has been discussed based on microstructural characterization results. Mechanical properties have been evaluated by means of Vickers microhardness measurements, tensile testing at temperatures up to 973.15 K (700.15 °C), and creep testing at 873.15 K (600.15 °C) and 260 MPa. Alloys close to the eutectic composition show significantly superior strength and creep resistance compared to P92. Finally, however, their low tensile ductility may limit their applications at relatively low temperatures.

Authors:
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1286696
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 3; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tan, Lizhen, and Yang, Ying. Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys. United States: N. p., 2014. Web. doi:10.1007/s11661-014-2695-1.
Tan, Lizhen, & Yang, Ying. Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys. United States. doi:10.1007/s11661-014-2695-1.
Tan, Lizhen, and Yang, Ying. Fri . "Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys". United States. doi:10.1007/s11661-014-2695-1. https://www.osti.gov/servlets/purl/1286696.
@article{osti_1286696,
title = {Microstructure and Mechanical Properties of Laves Phase-strengthened Fe-Cr-Zr Alloys},
author = {Tan, Lizhen and Yang, Ying},
abstractNote = {Laves phase-reinforced alloys have shown some preliminary promising performance at room temperatures. This paper aims at evaluating mechanical properties of Laves phase-strengthened alloys at elevated temperatures. Three Fe-Cr-Zr alloys were designed to favor the formation of eutectic microstructures containing Laves and body-centered cubic phases with the aid of thermodynamic calculations. Microstructural characterization was carried out on the alloys in as-processed and aged states using optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The effect of thermal aging and alloy composition on microstructure has been discussed based on microstructural characterization results. Mechanical properties have been evaluated by means of Vickers microhardness measurements, tensile testing at temperatures up to 973.15 K (700.15 °C), and creep testing at 873.15 K (600.15 °C) and 260 MPa. Alloys close to the eutectic composition show significantly superior strength and creep resistance compared to P92. Finally, however, their low tensile ductility may limit their applications at relatively low temperatures.},
doi = {10.1007/s11661-014-2695-1},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 3,
volume = 46,
place = {United States},
year = {2014},
month = {12}
}

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Works referenced in this record:

Thermodynamic modeling and experimental study of the Fe–Cr–Zr system
journal, October 2013


On the potentiality of using ferritic/martensitic steels as structural materials for fusion reactors
journal, December 2003


Advances in Physical Metallurgy and Processing of Steels. Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel.
journal, January 2001


Laves-phase superalloys?
journal, June 1992