超大规格TA15钛合金棒材锻造工艺研究

分别采用一次镦拔、两次镦拔和直接拔长3种开坯锻造工艺锻制了400 mm TA15钛合金棒材,并对比分析了棒材的低倍组织、显微组织、力学性能以及探伤杂波水平。结果表明,在铸锭开坯时通过两次镦拔变形增加β相区的变形量,在中间锻造及成品锻造时保证变形量分别大于40%和30%,再经800℃×2 h/AC热处理后,可以得到边部、1/2R处及心部组织均匀细小的Ф400 mm TA15钛合金棒材,且各项力学性能符合用户标准要求,探伤杂波水平可达Ф3.2 mm-9 dB。

Research on Forging Process of Super Large-sized TA15 Titanium Alloy Bars

Three different forging processes were investigated which include upset-draw process, double upset-draw process and draw process to fabricate φ400 mm TA17 titanium alloy bars, then compared the macrostructures, microstructures, mechanical properties and flaw detection levels of the bars. The results show that, using double upset-draw process in ingot cogging can increase the deformation amount in β region. After deformation of 40% and 30% in the intermediate and product forging with annealing at 800℃ × 2 h/AC, the microstructures in different positions are fine and homogeneous, the mechanical properties of bars can meet the standards and flaw detection level is 43.2 mm -9 dB.