CAJ | 학술논문

通过Ti-22Al-25Nb(Ti2AlNb基合金)与TC11((α+β)钛合金)的线性摩擦焊接,研究焊接工艺参数对接头外貌及界面结合率的影响,观察接头附近显微组织,并测试了其显微硬度.结果表明,随着焊接工艺参数,如摩擦时间、摩擦频率和摩擦压力的提高,接头的结合率显著提高;在焊接和随后的冷却过程中,TC11合金侧的热影响区域发生了α→β→α'相变,形成的大量针状马氏体α'相使焊缝区的显微硬度值显著增大;Ti-22Al-25Nb合金侧的热影响区域主要发生了(O,α_2)→B2/β相变,随着O相和α_2相的减少,该区域金属的显微硬度值显著降低.在合适的工艺条件下,线性摩擦焊接Ti-22Al-25Nb合金与TC11合金能够形成质量完好的焊接接头.
통과Ti-22Al-25Nb(Ti2AlNb기합금)여TC11((α+β)태합금)적선성마찰한접,연구한접공예삼수대접두외모급계면결합솔적영향,관찰접두부근현미조직,병측시료기현미경도.결과표명,수착한접공예삼수,여마찰시간、마찰빈솔화마찰압력적제고,접두적결합솔현저제고;재한접화수후적냉각과정중,TC11합금측적열영향구역발생료α→β→α'상변,형성적대량침상마씨체α'상사한봉구적현미경도치현저증대;Ti-22Al-25Nb합금측적열영향구역주요발생료(O,α_2)→B2/β상변,수착O상화α_2상적감소,해구역금속적현미경도치현저강저.재합괄적공예조건하,선성마찰한접Ti-22Al-25Nb합금여TC11합금능구형성질량완호적한접접두.
Weld-ability of dissimilar titanium alloys Ti-22Al-25Nb/TC11 in linear friction welding was investigated by using different welding parameters.The emphasis was placed on the evolution and characterization of the microstructure of the joints.The results showed that the bonding ratio of these two alloys improved obviously with the increase of the friction time,frequency and force.Phase transformation α→β→α' was found at the heat affected zone of TC11 alloy during the welding and the cooling process.The micro-hardness value of this zone increased significantly due to α' phase formed.Phase transformation (O,α_2)→B2/β was found at the heat affected zone of Ti-22Al-25Nb alloy while the micro-hardness value of the metal in this zone decrease with the decrease of O/α_2 phase.The results suggest that a sound weld with fine structures could be formed under appropriate welding parameters.