摘要:
为制定和优化TC4钛合金中厚板轧制工艺,开发综合力学性能优异的TC4钛合金中厚板,某公司基于4 300 mm热轧厂装备特点开展了TC4钛合金中厚板轧制工业试验,研究了轧制温度、道次变形量对其显微组织和力学性能的影响规律。结果表明:在(α+β)两相区,随着轧制温度降低,TC4钛合金中厚板的晶粒尺寸不断减小,强度、塑性和韧性不断增加;随着道次变形量降低,中厚板表层与心部的显微组织更加均匀,塑性和韧性显著提高。经过退火处理(850℃×2 h,AC)后,TC4钛合金中厚板的组织均匀性明显提高,实现了强度—塑性—韧性的良好匹配。
Abstract:
In order to establish and optimize the rolling process of TC4 titanium alloy plate with moderate thickness and develop the TC4 titanium alloy plate with excellent comprehensive mechanical properties,the rolling industrial test of TC4 titanium alloy plate with moderate thickness was carried out in a company based on the characteristics of 4 300 mm hot rolling equipment.The effects of rolling temperature and pass deformation on microstructure and mechanical properties of the TC4 titanium alloy plate were studied.The results show that in the（α + β） two-phase region,the grain size of TC4 titanium alloy plate decreases continuously while the strength,plasticity and toughness of the plate gradually increase with decrease in the rolling temperature.As the pass deformation decreases,the microstructure of the surface and core of the plate trends to be more uniform,and the plasticity and toughness are significantly improved.After annealing（850 ℃×2 h,AC） treatment,the homogeneity of TC4 titanium alloy plate with moderate thickness can be improved obviously,realizing a well match during the strength,plasticity and toughness.
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