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Si-Ca脱氧微Ti钢以不同冷却速度获得的铸态组织中,存在着许多含Ti氧化物的球形复合夹杂,粗大的TiN夹杂可以以它们为核心而产生,也可以独立存在,部分与硫化物形成复合夹杂。硫化物的组分是多种形式的,有MnS,(Mn,Fe)S及FeS。部分硫化物固溶了少量的Ti,极其细小(大约5nm)弥散析出的TiN的数量及大小受冷却速度的影响很大。总的趋势是:铸态凝固冷却速度对控制Ti的氧化,TiN及其复合夹杂的形成以及含Ti固溶体过饱和度均有较大影响。 文中首先报道了应用AA法获得大夹杂及细小质点完整性的试验结果,并重点介绍铸态凝固冷却速度增加对防止Ti的氧化,减少粗大夹杂及控制细小TiN的析出的结果。
Si-Ca deoxidized micro-Ti steel obtained at different cooling rates in the as-cast microstructure, there are many spherical composite inclusions containing Ti oxides, coarse TiN inclusions can be generated as they are the core, it can also exist independently, in part with the vulcanization Complex formation of inclusions. Sulfide components are in many forms, with MnS, (Mn, Fe) S and FeS. Part of the sulfide solid solution of a small amount of Ti, very small (about 5nm) The amount and size of the precipitated TiN greatly affected by the cooling rate. The general trend is that the as-cast solidification cooling rate has a great influence on controlling the oxidation of Ti, the formation of TiN and its composite inclusions and the supersaturation of Ti-containing solid solution. In this paper, the experimental results of large inclusions and fine particle integrity obtained by AA method are first reported. The results show that the cooling rate of as-cast solidification increases to prevent the oxidation of Ti, reduce the coarse inclusions and control the precipitation of fine TiN.