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Title: Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

Abstract

We conduct a series of thermal and mechanical testing on a commercial dual phase (DP) 980 steel in order to quantify the effects of tempering on its individual phase properties. Tempering treatment is conducted at 250 °C and 400 °C for 60 minutes each. Ferrite and martensite grains are distinguished using electron backscatter diffraction (EBSD) and scanning probe microscopy (SPM), and the martensite volume fractions (MVF) are determined based on the image quality (IQ) map. Multi-scale indentation tests combined with a newly developed inverse method are used to obtain the individual phase flow properties in each tempered DP980 sample. The results show that, i) tempering significantly reduces martensite yield strength, while it only slightly reduces the ferrite yield strength; ii) tempering temperature has a more significant influence on the work hardening exponent of ferrite than that of martensite; iii) the elastic modulus of martensite is consistently higher than that of ferrite. As a validation, a simple rule of mixtures is used to verify the above-predicted individual phase flow stresses with the experimentally obtained overall true stress vs. true strain curves. The methodology and the corresponding results shown in this study can help guide the selection of tempering parameters in optimizingmore » the mechanical properties of DP steels for their intended applications.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1337220
Report Number(s):
PNNL-SA-116584
Journal ID: ISSN 0921-5093; VT0505000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 667; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cheng, G., Zhang, F., Ruimi, A., Field, D. P., and Sun, X. Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation. United States: N. p., 2016. Web. doi:10.1016/j.msea.2016.05.011.
Cheng, G., Zhang, F., Ruimi, A., Field, D. P., & Sun, X. Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation. United States. doi:10.1016/j.msea.2016.05.011.
Cheng, G., Zhang, F., Ruimi, A., Field, D. P., and Sun, X. Wed . "Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation". United States. doi:10.1016/j.msea.2016.05.011.
@article{osti_1337220,
title = {Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation},
author = {Cheng, G. and Zhang, F. and Ruimi, A. and Field, D. P. and Sun, X.},
abstractNote = {We conduct a series of thermal and mechanical testing on a commercial dual phase (DP) 980 steel in order to quantify the effects of tempering on its individual phase properties. Tempering treatment is conducted at 250 °C and 400 °C for 60 minutes each. Ferrite and martensite grains are distinguished using electron backscatter diffraction (EBSD) and scanning probe microscopy (SPM), and the martensite volume fractions (MVF) are determined based on the image quality (IQ) map. Multi-scale indentation tests combined with a newly developed inverse method are used to obtain the individual phase flow properties in each tempered DP980 sample. The results show that, i) tempering significantly reduces martensite yield strength, while it only slightly reduces the ferrite yield strength; ii) tempering temperature has a more significant influence on the work hardening exponent of ferrite than that of martensite; iii) the elastic modulus of martensite is consistently higher than that of ferrite. As a validation, a simple rule of mixtures is used to verify the above-predicted individual phase flow stresses with the experimentally obtained overall true stress vs. true strain curves. The methodology and the corresponding results shown in this study can help guide the selection of tempering parameters in optimizing the mechanical properties of DP steels for their intended applications.},
doi = {10.1016/j.msea.2016.05.011},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
issn = {0921-5093},
number = C,
volume = 667,
place = {United States},
year = {2016},
month = {6}
}