冷轧退火含磷高强IF钢的组织和性能

Microstructures and properties of phosphorus-containing high strength cold rolled and annealed IF steels

在工业生产中,对罩式退火和连续退火方式生产的含磷高强无间隙原子钢的组织和性能进行研究,并与罩式退火生产的商用级铝镇静钢DC01和超深冲级无间隙原子钢DC04的成形性能进行对比,结果表明,含磷高强IF钢的成品组织均以等轴的铁素体为基体,力学性能满足标准要求,但罩式退火生产的含磷高强钢成形性能要显著地弱于连续退火产品,织构和位向分布函数测定表明,γ织构的密度按照罩式退火含磷钢、商用级DC01、连续退火加磷高强钢和DC04的顺序依次增加。

On industrial scale, high strength P-containing IF （Interstitial Free） steels were produced with both batch annealing and continuous annealing processes and their microstructures and properties were studied. Form- ing abilities of the two steels were compared with commercial Al-killed steel DC01 and extreme deep drawing IF steel DC04 produced with batch annealing. The results show that the microstructures of high strength IF steels are composed of equi-axial ferrite and their mechanical properties meet the requirement of relevant standard. The batch annealed high strength P-containing steels show poorer formability than continuous annealed ones. The test results of texture and orientation distribution function （ODF） demonstrate that density of T-fiber increases in order of batch annealed high strength P-containing IF steel, commercial DC01, continuous annealed high strength P-contai- ning IF steel and normal IF steel DC04.