skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Crystal plasticity modeling of irradiation effects on flow stress in pure-iron and iron-copper alloys

Authors:
ORCiD logo;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1397545
Grant/Contract Number:
AC07-05ID14517
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Mechanics of Materials
Additional Journal Information:
Journal Volume: 101; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:31:34; Journal ID: ISSN 0167-6636
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Chakraborty, Pritam, and Bulent Biner, S. Crystal plasticity modeling of irradiation effects on flow stress in pure-iron and iron-copper alloys. Netherlands: N. p., 2016. Web. doi:10.1016/j.mechmat.2016.07.013.
Chakraborty, Pritam, & Bulent Biner, S. Crystal plasticity modeling of irradiation effects on flow stress in pure-iron and iron-copper alloys. Netherlands. doi:10.1016/j.mechmat.2016.07.013.
Chakraborty, Pritam, and Bulent Biner, S. 2016. "Crystal plasticity modeling of irradiation effects on flow stress in pure-iron and iron-copper alloys". Netherlands. doi:10.1016/j.mechmat.2016.07.013.
@article{osti_1397545,
title = {Crystal plasticity modeling of irradiation effects on flow stress in pure-iron and iron-copper alloys},
author = {Chakraborty, Pritam and Bulent Biner, S.},
abstractNote = {},
doi = {10.1016/j.mechmat.2016.07.013},
journal = {Mechanics of Materials},
number = C,
volume = 101,
place = {Netherlands},
year = 2016,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.mechmat.2016.07.013

Save / Share:
  • The mechanistic modeling of irradiation induced embrittlement of reactor pressure vessel steels strongly depends on the precise evaluation of flow stress behavior. This requires accu- rate characterization of change in both the yield strength as well as the strain-hardening capacity. A dislocation-density based crystal plasticity model is thus developed in this work to quantify these variations with irradiation. The model considers the interaction between dislocations and irradiation induced defects such as self-interstitial atomic loops, vacancy clusters and precipitates to obtain flow stress variations in irradiated ferritic alloys. The model is calibrated and validated for polycrystalline pure-iron and iron-copper alloys, neutron-irradiatedmore » to different dose levels under typical pressure vessel operating conditions. A comparison with experimental results show that the model is able to quantify the changes in flow stress behavior accurately. At 0.2 dpa a loss of strain-hardening capacity beyond 2% strain is also obtained from the model. The yield strength increase with irradiation obtained from the model is also compared with analytical strengthening models based on Orowan’s equation.« less
  • A reaction-diffusion based mean field rate theory model is implemented in the viscoplastic self-consistent (VPSC) crystal plasticity framework to simulate irradiation growth in hcp Zr and its alloys. A novel scheme is proposed to model the evolution (both number density and radius) of irradiation-induced dislocation loops that can be informed directly from experimental data of dislocation density evolution during irradiation. This framework is used to predict the irradiation growth behavior of cold-worked Zircaloy-2 and trends compared to available experimental data. The role of internal stresses in inducing irradiation creep is discussed. Effects of grain size, texture, and external stress onmore » the coupled irradiation growth and creep behavior are also studied.« less
  • The authors propose a Monte Carlo simulation of the coherent precipitation of copper in {alpha}-iron using a vacancy diffusion mechanism. The only adjustable parameters are the vacancy concentration and the local vacancy jump frequencies. The latter are deduced from pair interactions restricted to nearest neighbor atoms. Precipitation kinetics are compared to recent experimental studies of precipitation in dilute Fe-Cu solid solutions during thermal ageing or electron irradiation (electrical resistivity measurements). The degree of advancement of the unmixing process as a function of time has the form of a stretched exponential, in good agreement with experiment. The simulation also provides interestingmore » information on precipitate morphology and growth mechanisms which are useful for experimental data analysis.« less