【摘要】 在实验室利用箱式炉对T4003高强度铁素体不锈钢进行640～850℃的退火处理，通过光学显微镜、扫描电镜及拉伸试验等测试手段，对试验钢的组织和力学性能进行分析。结果表明，退火后基体组织均主要为铁素体和少量的细小碳化物颗粒；退火温度在640℃时，晶粒大小不均现象较明显；680～780℃退火时，仍有晶粒大小不均现象，但细小晶粒的数量随退火温度升高增多；830℃和850℃退火时，发生奥氏体相变，得到细小的再结晶晶粒。热轧态试验钢的强度高、塑性低；随着退火温度升高，强度呈先下降后上升的趋势，断后伸长率则呈先升高后下降的趋势。640℃退火时试验钢的屈服强度略低于高强度不锈钢的要求(R_p0.2≥350 MPa),其它退火温度下屈服强度均满足高强钢要求，可根据强度级别需求选择合理的退火温度。更多还原

【Abstract】 Microstructure and mechanical properties of the T4003 high strength ferritic stainless steel annealed at 640-850 ℃ by using a box furnace in laboratory were analyzed by means of optical microscope, scanning electron microscope and tensile test. The results show that after annealing, the matrix is mainly composed of ferrite and a few fine carbide particles. When the annealing temperature is 640 ℃, the uneven grain size is obvious. When annealed at 680-780 ℃, the grain size is still uneven, but the number of fine grains increases with the increase of annealing temperature. When the annealing temperature is 830 ℃ and 850 ℃, the austenite transformation occurs and fine recrystallized grains are obtained. The as-hot-rolled tested steel has high strength and low plasticity, while with the increase of annealing temperature, the strength shows a trend of first decreasing and then increasing, and the elongation after fracture shows a trend of first increasing and then decreasing. The yield strength of the tested steel annealed at 640 ℃ is slightly lower than the requirement of high strength stainless steel(R_p0.2≥350 MPa), but that at other annealing temperatures meets the requirement. The reasonable annealing temperature can be selected according to the requirements of the strength level.更多还原