CAJ | 학술논문

研究了Ti-1100高温钛合金和CaO坩埚在可控气氛下感应熔炼时的相互作用，并对合金组织、化学成分、显观硬度以及与坩埚的界面反应进行分析。结果表明：合金的铸态组织是典型的魏氏组织。熔融金属和CaO坩埚的界面反应是由坩埚轻微的化学溶解和微弱的物理侵蚀引起的。根据线扫描分析，合金在坩埚底部和侧部界面反应区的α层厚度分别为18和17μm，这比采用硬度测试所获得的实验数据要小。α反应层的形成机制是间隙氧原子。还对Ti-1100合金CaO(s)=Ca+O反应的标准吉布斯自由能进行了测定，得到Ca和O的平衡常数和相互作用参数分别为lg K=-3.14和 CaOe =-3.54。
연구료Ti-1100고온태합금화CaO감과재가공기분하감응용련시적상호작용，병대합금조직、화학성분、현관경도이급여감과적계면반응진행분석。결과표명：합금적주태조직시전형적위씨조직。용융금속화CaO감과적계면반응시유감과경미적화학용해화미약적물리침식인기적。근거선소묘분석，합금재감과저부화측부계면반응구적α층후도분별위18화17μm，저비채용경도측시소획득적실험수거요소。α반응층적형성궤제시간극양원자。환대Ti-1100합금CaO(s)=Ca+O반응적표준길포사자유능진행료측정，득도Ca화O적평형상수화상호작용삼수분별위lg K=-3.14화 CaOe =-3.54。
Ti-1100 alloys were melted in a controlled atmospheric induction furnace equipped with a CaO crucible. The microstructure, chemical composition, microhardness and metal-crucible interfacial reactions were systematically investigated. The results demonstrate that the primary solidification microstructure in the as-cast alloys was the typical Widmanst?tten structure. The interactions between crucible and molten alloys are attributed to slight chemical dissolution and weak physical erosion. According to the line scanning analysis, the interfacial layer (α-case) thicknesses of Ti-1100 samples in the bottom and side wall are about 18 and 17μm, respectively, which are slightly lower than those presented from microhardness tests (25 and 20μm). The formation ofα-case was caused by interstitial oxygen atoms. The standard Gibbs energy of reaction CaO(s)=Ca+O for Ti-1100 alloy was also determined. The equilibrium constant and the interaction parameter between calcium and oxygen were obtained as lgK=-3.14 andCaOe=-3.54.