CAJ | 학술논문

将自制的25 kg级BaZrO3坩埚用于Ti-55.8％Ni合金（质量分数）的真空感应熔炼，并将合金铸锭经锻造、轧制、拉拔等工序制成φ1.0 mm的TiNi合金丝材，取样经不同的制度热处理后，分析了TiNi合金丝材的拉伸性能、低周弯曲疲劳性能以及拉伸、疲劳断口形貌。结果表明：丝材经700℃保温1 h水淬处理后，延伸率可达23％，韧窝尺寸变小、数量增多，且微孔数量大幅减少。此外，丝材经500℃或550℃保温20 min水淬处理后，疲劳寿命得到提高，最高可达3072次，疲劳断口处贝纹线排列紧密，裂纹较短且部分存在分叉现象。
장자제적25 kg급BaZrO3감과용우Ti-55.8％Ni합금（질량분수）적진공감응용련，병장합금주정경단조、알제、랍발등공서제성φ1.0 mm적TiNi합금사재，취양경불동적제도열처리후，분석료TiNi합금사재적랍신성능、저주만곡피로성능이급랍신、피로단구형모。결과표명：사재경700℃보온1 h수쉬처리후，연신솔가체23％，인와척촌변소、수량증다，차미공수량대폭감소。차외，사재경500℃혹550℃보온20 min수쉬처리후，피로수명득도제고，최고가체3072차，피로단구처패문선배렬긴밀，렬문교단차부분존재분차현상。
Ti-55.8 wt%Ni alloy ingot was prepared by vacuum induction melting in 25 kg-grade home-made BaZrO 3 crucible, and the ingot was turned into φ1.0 mm wire by forging, rolling, drawing and etc.For the TiNi wire samples followed by different heat treatments , their tensile properties , low cyclic bending fatigue behaviors , fractographies and fatigue fractography morphologies were analyzed .The results show that , after water quenching at 700 ℃for 1 h, the elongation of samples can reach 23%, and the sizes of dimples become smaller , while the numbers of dimples and micropores are shrink.Besides, after water quenching at 500 ℃ or 550 ℃ for 20 min, the fatigue life of samples is improved, which can reach 3 072 times.Cowrie pattern lines of fatigue fractographies are arrayed closely , and cracks in the matrix are small and part of the cracks are bifurcate .