CAJ | 학술논문

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矱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矱400 mm TA15钛合金棒材，且各项力学性能符合用户标准要求，探伤杂波水平可达矱3.2 mm -9 dB。
분별채용일차대발、량차대발화직접발장3충개배단조공예단제료확400 mm TA15태합금봉재，병대비분석료봉재적저배조직、현미조직、역학성능이급탐상잡파수평。결과표명，재주정개배시통과량차대발변형증가β상구적변형량，재중간단조급성품단조시보증변형량분별대우40％화30％，재경800℃×2 h/AC열처리후，가이득도변부、1/2R처급심부조직균균세소적확400 mm TA15태합금봉재，차각항역학성능부합용호표준요구，탐상잡파수평가체확3.2 mm -9 dB。
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 , micro-structures, 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 βregion.After deformation of 40%and 30%in the in-termediate 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 φ3.2 mm -9 dB.