TY - JOUR
T1 - Computational material design for Q&P steels with plastic instability theory
AU - Cheng, G.
AU - Choi, K. S.
AU - Hu, X. H.
AU - Sun, X.
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/10/15
Y1 - 2017/10/15
N2 - The ultimate tensile strength (UTS) and uniform elongation (UE) of quenching and partitioning (Q&P) steels under tension were examined with a combined theoretical, experimental and computational approach. The constituent phase properties of various Q&P steels were first estimated based on in situ high-energy X-ray diffraction (HEXRD) tensile tests under the quasi-static strain rate and room temperature. Plastic instability theory with the rule of mixtures (ROM) was then applied to the obtained phase properties to estimate the UTS/UE of the Q&P steels. A parametric study was also performed to examine the effects of various material parameters on the UTS/UE of Q&P steels. Computational material design was subsequently conducted based on the information obtained from the parametric study. The results showed that the plastic instability theory with iso-stress-based ROM may be used to estimate the UEs of the evaluated Q&P steels. The results also indicated that higher austenite stability/volume fractions, less strength difference between the primary phases, and higher hardening exponents of the constituent phases are generally beneficial for performance improvement of Q&P steels, and various material parameters may be concurrently adjusted in a cohesive way to improve performance of Q&P steel.
AB - The ultimate tensile strength (UTS) and uniform elongation (UE) of quenching and partitioning (Q&P) steels under tension were examined with a combined theoretical, experimental and computational approach. The constituent phase properties of various Q&P steels were first estimated based on in situ high-energy X-ray diffraction (HEXRD) tensile tests under the quasi-static strain rate and room temperature. Plastic instability theory with the rule of mixtures (ROM) was then applied to the obtained phase properties to estimate the UTS/UE of the Q&P steels. A parametric study was also performed to examine the effects of various material parameters on the UTS/UE of Q&P steels. Computational material design was subsequently conducted based on the information obtained from the parametric study. The results showed that the plastic instability theory with iso-stress-based ROM may be used to estimate the UEs of the evaluated Q&P steels. The results also indicated that higher austenite stability/volume fractions, less strength difference between the primary phases, and higher hardening exponents of the constituent phases are generally beneficial for performance improvement of Q&P steels, and various material parameters may be concurrently adjusted in a cohesive way to improve performance of Q&P steel.
KW - Material design
KW - Multiphase advanced high strength steels
KW - Plastic instability theory
KW - Quenching and partitioning steels
KW - Rule of mixtures
UR - http://www.scopus.com/inward/record.url?scp=85026811250&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2017.07.029
DO - 10.1016/j.matdes.2017.07.029
M3 - Article
AN - SCOPUS:85026811250
SN - 0264-1275
VL - 132
SP - 526
EP - 538
JO - Materials and Design
JF - Materials and Design
ER -