Effect of Different Casting Parameters on the Cleanliness of High Manganese Steel Ingots Compared to High Carbon Steel
- PDF / 1,188,731 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 100 Downloads / 177 Views
ON
THE demand for high quality steels for automobile production is on the rise during the past decades. The need to minimize fuel consumption and save costs has increased the quest for lighter but high-performing steel products suitable for application in construction, too. Controlling each step of the production process is pertinent to achieving the right steel properties in the end. This necessity supported the development of new high technological and high quality materials like TWIP or TRIP steels.[1,2] 95 Pct of steels produced worldwide are now done through the continuous casting process because of its high production efficiency.[3] However, the ingot-casting process is more appealing concerning the relatively low amounts, before those steel grades will be established. The production of TWIP and TRIP steels is under investigation at the collaborative research center, SFB 761 ‘‘Steel-ab initio,’’ in Germany through computer models, which calculate the structures on different scales starting from atomic crystal lattice based on the chemical composition of the steels. The calculated mechanical properties by the models are compared to PETRICO VON SCHWEINICHEN and ZHIYE CHEN, Ph.D. Students, and DIETER SENK, Professor, are with the Department of Ferrous Metallurgy, RWTH Aachen University, Intzestrasse 1, 52072 Aachen, Germany. Contact e-mail: petrico.von.schweinichen@iehk. rwth-aachen.de ALEXANDER LOB, formerly Ph.D. Student with the Department of Ferrous Metallurgy, RWTH Aachen University, is now Technical Adviser with the DEW, Auestrasse 4, 58452 Witten, Germany. Manuscript submitted July 2, 2012. Article published online August 22, 2013 5416—VOLUME 44A, DECEMBER 2013
the properties obtained through material testing. Effects of solute segregation and non-metallic inclusions on the mechanical properties of steels are well-known. In the current study, high manganese alloyed TWIP and TRIP steels are in the focus. Because a minor change of the chemical composition leads to major changes of deformation mechanisms and mechanical properties, it is indispensable to control the as-cast structure and to improve the cleanliness of the steels. Structure components inside the material such as non-metallic inclusions or segregations result in deviations of the expected mechanical properties and therefore lead to misinterpretations when defining the quality of the product. The objective of this work is to examine and improve the cleanliness of high manganese alloyed steels. A number of research studies have been performed to compare the effect of different casting parameters to the cleanliness.[4–9] With increasing importance of the ingotcasting method for high alloyed (high-tech) steel grades naturally arises new research demand in this field. Non-metallic inclusions cause major material defects such as fatigue behavior, decreasing ductility, crackwhile-forging or -rolling, surface defects, slag lines and scales.[10–12] Determining the source of these inclusions is important to finding lasting engineering solutions to the problem of c
Data Loading...
