外加纳米Ti_2O_3颗粒对X80管线钢铸态组织的影响

Effect of Outer Addition of Nano-Ti_2O_3 Particles on Microstructure of As Cast X80 Pipeline Steel

将纳米Ti2O3颗粒与微米铁粉载体混合并冷压后在真空条件下添加进X80管线钢钢液中,其中单纯重熔试样与原始钢样比较,夹杂物颗粒和疑似缩松的部分较多,而且也比较粗大;添加少量(0.01%)纳米Ti2O3颗粒的试样的夹杂物颗粒和疑似缩松的分布和数量与单纯重熔的相似,但在那些夹杂或缩松位置处并未检测到Ti的组分;当纳米Ti2O3颗粒的添加量为0.1%时,在有些夹杂或缩松的位置检测到了Ti的组分,这些Ti有的以Ti的氧化物形式存在,有的则与其他夹杂或元素反应,形成氧化物之外的夹杂或复合夹杂,此时X80管线钢铸态晶粒组织获得了细化。

After mixing with micro-iron powder which was taken as the carrier and cold pressing, the nano-Ti2O3 powders were added into the melt of X80 pipeline steel under vacuum condition. Compared with the original steel, the only re-melted steel has lager and most inclusion or suspected shrinkage area. The specimen which the addition of nano-Ti2O3 particles is lower as 0.01%, has a similar distribution and amount of the area of inclusions or suspected shrinkage as that of only re-melted steel, but the Ti component can not be detected at those areas. If the addition of nano-Ti2O3 particles is up to 0.1%, the Ti component can be detected in some areas of inclusion or shrinkage. Some of the Ti exists as titanium oxide and some of it can react with other element or inclusion to form non-oxide inclusions or multi-inclusions. In this case, the grain size of the steel as cast becomes finer.