卷取温度、冷轧总变形量对含硼08Al钢力学性能的影响

Influence of Coiling Temperature and Total Cold Rolling Reduction Rate on Mechanical Properties of B-Containing 08A1 Steel

以CSP工艺在不同卷取温度下生产的含B（（40-60）×10^-6,质量分数）和无B 08A1的冷轧基板为实验材料,采用不同的冷轧总变形量进行冷轧退火后,通过单向拉伸实验对两种钢的基本成形性能指标（r值、n值）和力学性能指标（屈服强度、抗拉强度、伸长率）进行测定,并对卷取温度为620℃、冷轧总压下量为75%的两种钢的退火试样进行织构测试和EBSD分析。对比分析发现,卷取温度、冷轧压下量对退火后的无B 08Al钢和含B 08A1钢成形性能及力学性能的影响显著,ODF和EBSD分析表明,含B钢中的γ纤维织构组分要低于无B钢,而旋转立方织构（{001}〈110〉）和Goss织构（{011}〈100〉）明显高于无B钢。

B-containing（（40-60）× 10^-6, mass fraction） and B-free 08Al hot strips produced by CSP process were used for experiment. The hot strips were coiled at different temperatures and then cold rolled with different reduction rate. After recrystallization annealing, the formability（r-value and n-value） and mechanical properties （YS,TS and A） were measured by tensile tests, in addition, two kinds of annealed sheets （coiling temperature 620℃;75 % reduction） were analyzed by X-ray diffraction（ODF） and electron back-scattered diffraction （EBSD）. The results showed that coiling temperature and total cold-rolling reduction rate have remarkable influence on the formability and mechanical properties of B-containing and B-free 08Al steels after recrystallization annealing. ODF EBSD tests showed that the fraction of T-fiber texture in B-containing steel is lower than that in B-free steel, nevertheless, the rotating cubic texture （{001} 〈110〉） and Goss texture （{011} 〈100〉） are much more than that in B-free steel.