IF钢与ELC钢织构及性能的对比

研究了经铁素体区热轧、冷轧和退火生产的ELC钢和IF钢的组织、织构及性能.结果表明,铁素体区热轧后,ELC钢中的大部分组织是变形带;而IF钢中已经形成了等轴晶粒.ELC钢的热轧织构中形成了较强的α织构和很弱的γ织构,织构主要组分集中在{001}〈110〉~{223}〈110〉;而IF钢中形成了强的γ织构和很弱的α织构.ELC钢的退火织构中主要是γ织构,但仍有较弱的α织构存在;IF钢的退火织构中只有很强并且均匀的γ织构,强度明显高于ELC钢的退火织构.与ELC钢相比,IF钢的平均塑性应变比(r值)高出0.6,延伸率高出5%,同时,抗拉强度升高,而屈服强度降低.

Comparison of Texture and Properties of IF Steel with ELC Steel

The microstructure, texture and mechanical properties of an ELC steel and an IF steel both produced by hot rolling in ferrite region, cold rolling and annealing were compared. The results showed that deformation bands are dominant in the ELC while equiaxed grains grow in the IF after hot rolling in ferrite region. The hot band texture of ELC includes not only strong α-fiber but weak γ-fiber, while that of IF is mainly the γ-fiber. However, after cold rolling and annealing, ELC presents mainly the γ-fiber texture with peak at {111} <112> , and IF presents the strong and well-proportioned γ-fiber texture which provides obviously higher strength than ELC. Moreover, the values of mean plastic strain ratio and percentage elongation of IF are 0.6 and 5% higher than ELC, respectively, with higher tensile strength and lower yield strength provided.