CAJ | 학술논문

采用金相、扫描电镜和电子背散射衍射(EBSD)研究两相区退火温度和时间对热压缩态 TC11(Ti-6.5Al-3.5Mo-1.5Zr-0.3Si)双相钛合金组织和微观取向的影响.结果表明:初始魏氏组织在850℃热压缩后被破坏,形成较为细小、扭折的片层组织,晶粒取向呈非均匀分布;在后续700和900℃退火过程中,α相变形组织和亚结构发生静态再结晶而转变为等轴状晶粒,晶粒尺寸较退火前的更为细小,再结晶程度和等轴组织比例随保温时间的延长而增加,片层组织的球化程度、晶粒取向和形貌的均匀性与合金的再结晶程度相关.在900℃退火时,α相的再结晶程度较700℃退火时的更为明显;经过120 min 退火后,合金发生完全再结晶,得到较为均匀、细小的等轴状组织.
채용금상、소묘전경화전자배산사연사(EBSD)연구량상구퇴화온도화시간대열압축태 TC11(Ti-6.5Al-3.5Mo-1.5Zr-0.3Si)쌍상태합금조직화미관취향적영향.결과표명:초시위씨조직재850℃열압축후피파배,형성교위세소、뉴절적편층조직,정립취향정비균균분포;재후속700화900℃퇴화과정중,α상변형조직화아결구발생정태재결정이전변위등축상정립,정립척촌교퇴화전적경위세소,재결정정도화등축조직비례수보온시간적연장이증가,편층조직적구화정도、정립취향화형모적균균성여합금적재결정정도상관.재900℃퇴화시,α상적재결정정도교700℃퇴화시적경위명현;경과120 min 퇴화후,합금발생완전재결정,득도교위균균、세소적등축상조직.
The effects of annealing temperature and time on the microstructure and microtexture of TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) titanium alloy pre-deformed by hot working were investigated using optical microscopy, scanning electron microscopy and electron back-scattered diffraction (EBSD). The results show that the initial Widmanst?tten structure is destroyed after hot compression at 850 °C, leading to fine and distorted lamellar structures with non-uniform grain orientation distributions. Upon subsequent annealing at 700 and 900 ℃, the deformed and substructured α phase evolve into refined equiaxed grains due to static recrystallization, while the extent of recrystallization and the proportion of equiaxed grains increase with the annealing time increasing. The globularization of lamellar structures and the heterogeneity of grain morphology and orientations depend on the extent of recrystallization.Compared with that of 700 ℃, annealing at 900 ℃ leads to more extensive recrystallization, and a reasonably homogeneous fully recrystallized microstructure with equiaxed fine grains is achieved after 120 min.