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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eCa O=-3.54。
The interaction between Ti-1100 high temperature titanium alloy and CaO crucible under controlled atmosphere induction melting was studied. The microstructure, chemical composition, apparent hardness and interfacial reaction with crucible were analyzed. The results show that the as-cast microstructure of the alloy is a typical Widmanstatten structure. The interfacial reaction between the molten metal and the CaO crucible is caused by a slight chemical dissolution of the crucible and weak physical erosion. According to the line scan analysis, the α-layer thicknesses of the alloy in the reaction zone at the bottom and the lateral interface of the crucible are 18 and 17 μm, respectively, which is smaller than the experimental data obtained by the hardness test. The formation mechanism of the α reaction layer is interstitial oxygen atoms. The Gibbs free energy of the reaction of CaO (s) = Ca + O in Ti-1100 alloy was also determined. The equilibrium constants and interaction parameters of Ca and O were obtained as lg K = -3.14 and eCa O = -3.54 .