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Title: DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS

Abstract

Tungsten (W) and W-alloys are the leading candidates for plasma-facing components in nuclear fusion reactor designs because of their high melting point, strength retention at high temperatures, high thermal conductivity, and low sputtering yield. However, tungsten is brittle and does not exhibit the required fracture toughness for licensing in nuclear applications. A promising approach to increasing fracture toughness of W-alloys is by ductile-phase toughening (DPT). In this method, a ductile phase is included in a brittle matrix to prevent on inhibit crack propagation by crack blunting, crack bridging, crack deflection, and crack branching. Model examples of DPT tungsten are explored in this study, including W-Cu and W-Ni-Fe powder product composites. Three-point and four-point notched and/or pre-cracked bend samples were tested at several strain rates and temperatures to help understand deformation, cracking, and toughening in these materials. Data from these tests are used for developing and calibrating crack-bridging models. Finite element damage mechanics models are introduced as a modeling method that appears to capture the complexity of crack growth in these materials.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390424
Report Number(s):
PNNL-SA-122073
Journal ID: ISBN 9781339471761; AT2030110
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Powder Metallurgy, 53(2):53-69; Journal Volume: 53; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
Tungsten; Tungsten composites; Ductile Phase Toughening; Fusion Materials; fracture and deformation; model and simulation

Citation Formats

Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, and Cunningham, Kevin. DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS. United States: N. p., 2017. Web.
Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, & Cunningham, Kevin. DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS. United States.
Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, and Cunningham, Kevin. Mon . "DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS". United States. doi:.
@article{osti_1390424,
title = {DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS},
author = {Henager, Charles H. and Setyawan, Wahyu and Roosendaal, Timothy J. and Overman, Nicole R. and Borlaug, Brennan A. and Stevens, Erica L. and Wagner, Karla B. and Kurtz, Richard J. and Odette, G Robert and Nguyen, Ba Nghiep and Cunningham, Kevin},
abstractNote = {Tungsten (W) and W-alloys are the leading candidates for plasma-facing components in nuclear fusion reactor designs because of their high melting point, strength retention at high temperatures, high thermal conductivity, and low sputtering yield. However, tungsten is brittle and does not exhibit the required fracture toughness for licensing in nuclear applications. A promising approach to increasing fracture toughness of W-alloys is by ductile-phase toughening (DPT). In this method, a ductile phase is included in a brittle matrix to prevent on inhibit crack propagation by crack blunting, crack bridging, crack deflection, and crack branching. Model examples of DPT tungsten are explored in this study, including W-Cu and W-Ni-Fe powder product composites. Three-point and four-point notched and/or pre-cracked bend samples were tested at several strain rates and temperatures to help understand deformation, cracking, and toughening in these materials. Data from these tests are used for developing and calibrating crack-bridging models. Finite element damage mechanics models are introduced as a modeling method that appears to capture the complexity of crack growth in these materials.},
doi = {},
journal = {International Journal of Powder Metallurgy, 53(2):53-69},
number = 2,
volume = 53,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}
  • The objective of this study is to investigate the deformation behavior of ductile phase toughened W-composites such as W-Cu and W-Ni-Fe by means of a multiscale finite element model that involves a microstructural dual-phase model where the constituent phases (i.e., W, Cu, Ni-Fe) are finely discretized and are described by a continuum damage model. Such a model is suitable for modeling deformation, cracking, and crack bridging for W-Cu, W-Ni-Fe, and other ductile phase toughened W-composites, or more generally, any multi-phase composite structure where two or more phases undergo cooperative deformation in a composite system. Our current work focuses on simulatingmore » the response and damage development of the W-Cu specimen subjected to three-point bending.« less
  • The objective of this study is to develop a finite element continuum damage model suitable for modeling deformation, cracking, and crack bridging for W-Cu, W-Ni-Fe, and other ductile phase toughened W-composites, or more generally, any multi-phase composite structure where two or more phases undergo cooperative deformation in a composite system.
  • The objective of this study is to develop a finite element continuum damage model suitable for modeling deformation, cracking, and crack bridging for W-Cu, W-Ni-Fe, and other ductile phase toughened W-composites, or more generally, any multi-phase composite structure where two or more phases undergo cooperative deformation in a composite system.
  • A promising approach to increasing fracture toughness and decreasing the DBTT of a W-alloy is by ductile-phase toughening (DPT) [1-3]. In this method, a ductile phase is included in a brittle matrix to prevent fracture propagation by crack bridging. To examine the prospect of DPT, W-Cu three-point bend samples were deformed at several strain rates and temperatures. Data from these tests is used for the calibration of a dynamic crack-bridging model that can effectively predict elevated temperature crack growth in W-composites. The development and initial testing of a Cu-ligament bridging model based on a micromechanical flow stress model of Cumore » is discussed. Good agreement with the 3-point bend testing data is demonstrated along with future plans to improve the model.« less
  • The objective of this study is to develop the materials science of fiber-reinforced tungsten composites as candidates for plasma-facing components in future fusion reactors.