Sustainable Manufacturing and Foundry Practices
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Ajay Kumar Pradhan1
, Pabitra Palai1, Pramod Yadav1 and M Manjunathan1
1Steel Making Shop, TATA Steel Limited, Jajpur, Odisha, India
Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-Commercial use, reproduction and distribution of the work without further permission provided the original work is attributed.
The special type of advanced high-strength steels (AHSS) based on nano precipitation strengthening mechanism was studied in the current work. It is a typical molybdenum and titanium based micro-alloyed steel under AHSS offers up to 800 Mpa tensile strength and have preferred application in the automobile industry owing to its impact on overall vehicle weight reduction with improved safety and fuel efficiency, The focus of study in this grade were failure due to cracking during forming on account of coarse Titanium Nitride (TiN) precipitate in such high-strength level above 800 Mpa tensile strength. The main challenges in this grade are chemical composition and casting parameters control, which have a direct influence on the microstructure and final properties that are attributed to precipitate size. The study has been done for the precipitation of TiN in high-strength steel by varying secondary cooling during slab casting. The model enabled the prediction of the expected inclusion size of TiN of a specific HS800 heats before rolling to enable slab decision. The main goal of this work was to obtain the dependence relationship between inclusion size and slab solidification and cooling rate during continuous casting.
Chemical composition, high-strength steel, precipitation strengthening, continuous slab casting
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