采用LF-RH双精炼工艺,在CSP流程上进行了340 MPa级冷轧IF高强钢的开发.试验材料达到成分设计要求,罩式炉退火后微观组织为细小等轴铁素体组织,晶粒度在10级左右,力学性能达到340 MPa级高强度无间隙原子钢要求.EBSD结果表明,试验材料退火织构由较强的γ织构(<111>∥ND)和一定强度的α织构(<110>//RD)组成,α取向中较高的{112}<110>和{001}<110>织构是导致试验材料r均值偏低和Δr小于0的主要原因.
Using the RH-LF duplex refining process,the 340 MPa cold rolled high strength IF steel was developed in CSP process.The material got the designed chemical composition.The test resulted showed that the microstructure was equiaxed ferrite after batch annealing,the grain size of test material was ASTM 10 and the mechanical properties met the specification requirements of the 340 MPa cold rolled high strength IF steel.The EBSD results showed the annealing texture were dominated by near γ texture (<111>∥ND) and some α textures (<110>//RD).And the higher density texture of {112}<110> and {001}<110> in the α textures of the test material caused that the test material had lower plastic strain ratio r and the Δr was below zero.
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