Inclusion Modification in Si–Mn Killed Steels using Titanium Addition

Vivek Thapliyal; Abhishek Kumar; David Robertson; Jeffrey Smith

摘要

Modification of inclusions by titanium (Ti) additions in low-alloyed Si–Mn killed steels was studied. Formation of the modified inclusions was studied by measuring the inclusion count and chemistry. Mn–Si–Al–S–O based inclusions were observed in the steel, after Si–Mn de-oxidation, to which ferro-titanium (FeTi) additions were made. Thermochemical software (FactSage) was used to study the equilibrium between steel and inclusions and subsequent modification due to Ti addition. Inclusion count and chemistry in the steel were measured at different time intervals after the FeTi additions. MnO–SiO_(2) inclusions transformed to TiO_(2)–MnO–SiO_(2) based inclusions with Ti replacing both Mn and Si in the inclusions. Si removal was more prominent from the inclusions compared to Mn. When more FeTi was added to the steel the inclusions further decreased in their Mn and Si content. With further FeTi addition Ti based inclusions with Al and Mn content less than 10% and Si content less than 5% were formed. MnS inclusions were also observed in the steel and formed as a result of segregation during solidification.

机译：研究了在低合金Si-Mn镇静钢中添加钛（Ti）对夹杂物的改性作用。通过测量夹杂物数量和化学性质研究了改性夹杂物的形成。在Si-Mn脱氧后，在钢中观察到Mn-Si-Al-S-O基夹杂物，并在其中添加了铁钛（FeTi）。使用热化学软件（FactSage）研究钢与夹杂物之间的平衡以及由于添加Ti而进行的后续改性。在添加FeTi之后的不同时间间隔内测量钢中的夹杂物数量和化学成分。 MnO–SiO_（2）夹杂物转变为TiO_（2）–MnO–SiO_（2）夹杂物，其中Ti替代了夹杂物中的Mn和Si。与锰相比，从夹杂物中去除硅更为突出。当向钢中添加更多的FeTi时，夹杂物的Mn和Si含量进一步降低。通过进一步添加FeTi，形成了Al和Mn含量小于10％且Si含量小于5％的Ti基夹杂物。在钢中还观察到MnS夹杂物，并由于凝固过程中的偏析而形成。

Inclusion Modification in Si–Mn Killed Steels using Titanium Addition

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