TY - JOUR
T1 - The effect of cold rolling reduction on the high-temperature mechanical properties of 9Cr-3Co-3W martensite heat-resistant steel
AU - Yang, Hongbo
AU - Sun, Meng
AU - Ren, Yingjie
AU - Li, Jialun
AU - Lan, Zhiyu
AU - Li, Xiaolin
AU - Wang, Haifeng
N1 - Publisher Copyright:
© 2025 Elsevier Ltd
PY - 2025/6
Y1 - 2025/6
N2 - To optimize the high-temperature mechanical properties of 9Cr-3Co-3W steel, cold rolling reductions of 0 %, 20 % and 40 % were applied, followed by tempering at 800°C for 30 min. The microstructure, precipitation behavior and fracture morphologies were then characterized to explain the mechanical properties. The results show that the steel with a 20 % cold rolling reduction exhibits the best mechanical performance (σb= 475 MPa, δ= 25 %), outperforming the 0 % and 40 % reduction. The high strength is primarily attributed to the dislocation strengthening and precipitation strengthening, as the 20 % reduction leads to the highest average dislocation density due to the lower recovery rate and fine precipitates. The good ductility is attributed to the lower recovery and precipitation nucleation driving force, which preserves microstructure homogeneity and maintains fine precipitate sizes, thus preventing high-temperature failure caused by large precipitates and deformation incompatibility, as observed in the fractured 40 % cold-rolled steel.
AB - To optimize the high-temperature mechanical properties of 9Cr-3Co-3W steel, cold rolling reductions of 0 %, 20 % and 40 % were applied, followed by tempering at 800°C for 30 min. The microstructure, precipitation behavior and fracture morphologies were then characterized to explain the mechanical properties. The results show that the steel with a 20 % cold rolling reduction exhibits the best mechanical performance (σb= 475 MPa, δ= 25 %), outperforming the 0 % and 40 % reduction. The high strength is primarily attributed to the dislocation strengthening and precipitation strengthening, as the 20 % reduction leads to the highest average dislocation density due to the lower recovery rate and fine precipitates. The good ductility is attributed to the lower recovery and precipitation nucleation driving force, which preserves microstructure homogeneity and maintains fine precipitate sizes, thus preventing high-temperature failure caused by large precipitates and deformation incompatibility, as observed in the fractured 40 % cold-rolled steel.
KW - Cold rolling
KW - Dislocation density
KW - Heat-resistant steel
KW - High-temperature mechanical properties
KW - Reduction rate
UR - http://www.scopus.com/inward/record.url?scp=105002574543&partnerID=8YFLogxK
U2 - 10.1016/j.mtcomm.2025.112526
DO - 10.1016/j.mtcomm.2025.112526
M3 - 文章
AN - SCOPUS:105002574543
SN - 2352-4928
VL - 46
JO - Materials Today Communications
JF - Materials Today Communications
M1 - 112526
ER -