摘要
A comparative investigation was conducted to evaluate the microstructure,mechanical properties,and corrosion resistance of hot-stamped steels fabricated via the compact strip production(CSP)and conventional cold-rolling methods.CSP steel exhibited an initial microstructure comprising ferrite,pearlite,and minor bainite,which retained a characteristic hot-rolled banded structure with refined ferrite grains(5.7μm).In contrast,conventionally processed steel displayed coarser equiaxed ferrite(9.8μm).In terms of mechanical properties,CSP parts demonstrated superior tensile strength(>1433 MPa)and elongation(>6.48%)compared to conventional counterparts(average elongation of 5.27%).However,CSP samples showed a 23 HV lower hardness,attributed to a deeper decarburization layer.Enhanced strength in CSP steel was linked to finer prior austenite grains and dislocation density inherited from the initial microstructure,despite potential undissolved cementite at lower austenitizing temperatures.Corrosion testing revealed improved resistance in CSP-processed steel,likely due to finer grains acting as barriers to corrosion propagation.The trade-offs in CSP are highlighted:while achieving higher strength-ductility synergy and corrosion resistance,decarburization effects necessitate optimization to mitigate hardness reduction.The potential of CSP for high-performance automotive applications requiring balanced mechanical and anti-corrosion properties is underscored.
基金
National Key Research and Development Program of China(Grant No.2021YFB3702405)
the National Natural Science Foundation of China(Grant No.52471036)
the Basic and Applied Basic Research Foundation of Guangdong Province(Grant No.2023A1515012363).
