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Title: Computational material design for Q&P steels with plastic instability theory

Abstract

In this paper, the deformation limits of Quenching and Partitioning (Q&P) steels are examined with the plastic instability theory. For this purpose, the constituent phase properties of various Q&P steels were first experimentally obtained, and used to estimate the overall tensile stress-strain curves based on the simple rule of mixture (ROM) with the iso-strain and iso-stress assumptions. Plastic instability theory was then applied to the obtained overall stress-strain curves in order to estimate the deformation limits of the Q&P steels. A parametric study was also performed to examine the effects of various material parameters on the deformation limits of Q&P steels. Computational material design was subsequently carried out based on the information obtained from the parametric study. The results show that the plastic instability theory with iso-stress-based stress-strain curve may be used to provide the lower bound estimate of the uniform elongation (UE) for the various Q&P steels considered. The results also indicate that higher austenite stability/volume fractions, less strength difference between the primary phases, higher hardening exponents of the constituent phases are generally beneficial for the performance improvement of Q&P steels, and that various material parameters may be concurrently adjusted in a cohesive way in order to improve themore » performance of Q&P steel. The information from this study may be used to devise new heat treatment parameters and alloying elements to produce Q&P steels with the improved performance.« less

Authors:
; ORCiD logo; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390412
Report Number(s):
PNNL-SA-124204
Journal ID: ISSN 0264-1275; 453060037
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials & Design; Journal Volume: 132; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Cheng, G., Choi, K. S., Hu, X. H., and Sun, X. Computational material design for Q&P steels with plastic instability theory. United States: N. p., 2017. Web. doi:10.1016/j.matdes.2017.07.029.
Cheng, G., Choi, K. S., Hu, X. H., & Sun, X. Computational material design for Q&P steels with plastic instability theory. United States. doi:10.1016/j.matdes.2017.07.029.
Cheng, G., Choi, K. S., Hu, X. H., and Sun, X. Sun . "Computational material design for Q&P steels with plastic instability theory". United States. doi:10.1016/j.matdes.2017.07.029.
@article{osti_1390412,
title = {Computational material design for Q&P steels with plastic instability theory},
author = {Cheng, G. and Choi, K. S. and Hu, X. H. and Sun, X.},
abstractNote = {In this paper, the deformation limits of Quenching and Partitioning (Q&P) steels are examined with the plastic instability theory. For this purpose, the constituent phase properties of various Q&P steels were first experimentally obtained, and used to estimate the overall tensile stress-strain curves based on the simple rule of mixture (ROM) with the iso-strain and iso-stress assumptions. Plastic instability theory was then applied to the obtained overall stress-strain curves in order to estimate the deformation limits of the Q&P steels. A parametric study was also performed to examine the effects of various material parameters on the deformation limits of Q&P steels. Computational material design was subsequently carried out based on the information obtained from the parametric study. The results show that the plastic instability theory with iso-stress-based stress-strain curve may be used to provide the lower bound estimate of the uniform elongation (UE) for the various Q&P steels considered. The results also indicate that higher austenite stability/volume fractions, less strength difference between the primary phases, higher hardening exponents of the constituent phases are generally beneficial for the performance improvement of Q&P steels, and that various material parameters may be concurrently adjusted in a cohesive way in order to improve the performance of Q&P steel. The information from this study may be used to devise new heat treatment parameters and alloying elements to produce Q&P steels with the improved performance.},
doi = {10.1016/j.matdes.2017.07.029},
journal = {Materials & Design},
number = C,
volume = 132,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}