累积叠轧焊制备超细晶IF钢微观组织与力学性能

Microstructure and Mechanical Properties of Ultra-fine Grained IF Steel Produced by Accumulative Roll-bonding(ARB)Process

采用累积叠轧焊方法制备了超细晶IF钢 ,对其微观组织和力学性能进行了分析。实验结果表明 ,累积叠轧后IF钢的平均晶粒尺寸为 70 0nm ;抗拉强度为 62 1 3MPa ,达到冷轧IF钢抗拉强度的 2 0 2倍 ,屈强比σ0 2 /σb 为 0 81。

Ultra fine grained interstitial free(IF)steel is prepared by accumulative roll bonding (ARB)process with its microstructure and mechanical properties investigated.Experimental results show that ultimate strength of the ultra fine grained IF steel with the mean grain size of 700 nm is increased to 621 3 MPa and the fracture behavior shows a brittleness character which results from the inclusion formed during ARB process.