Abstract
In recent years, white chromium cast iron has gained a well-settled position among wear-resistant materials. In recent times, chromium cast iron samples containing titanium have attracted attention. In cast iron samples, titanium combines with carbon and forms TiC particles, which may be form a crystallization underlay for eutectic M7C3 carbides and austenite. Accordingly, the inoculation process occurring in the crystallizing alloy should result in the proper, regular distribution of fine eutectic chromium carbides in the austenitic matrix. The presented research was conducted on 20% Cr hypoeutectic white cast iron with the addition of 0.5, 1, and 2% of Ti. Ti inoculation and the presence of TiC allowed for superior wear properties to be obtained. However, the conducted study revealed a significant decrease in the impact strength of examined alloys, especially for the cast iron samples with a high amount of Ti, in which the TiC compounds agglomerated. Titanium compounds accumulate in clusters and their distribution is irregular. Most of the TiC compounds were transported by the crystallization front into the center of the castings, where micropores were formed, meaning they were no longer effective crystallization underlays. In the authors’ opinion, the agglomerate formation is strictly connected with the appearance of bifilm defects in the casting microstructure. The conducted research shows how an incorrect volume of an additive may have negative influences on the properties of the casting. This is a vital issue not only from a technological point of view, but also for economic reasons.
Highlights
The source literature explains the existing research outlook regarding the modification of chromium cast iron [1,2,3,4,5,6,7,8,9,10,11,12]
A large number of publications describe the effects of nucleogenic elements after their addition to liquid metal, typically in the form of ferroalloys, which stimulate the creation of hard-to-melt compounds as crystallization underlays for primary austenite and chromium carbides, depending on the selected cast iron chemical composition [1,2,3,4,5,6,7,8,9]
The modification of high-chromium cast iron with titanium affects the casting crystallization, while the analysis of quantitative and qualitative microstructure tests showed that Ti may form the crystallization underlays for austenite and chromium carbides
Summary
The source literature explains the existing research outlook regarding the modification of chromium cast iron [1,2,3,4,5,6,7,8,9,10,11,12]. A large number of publications describe the effects of nucleogenic elements after their addition to liquid metal, typically in the form of ferroalloys, which stimulate the creation of hard-to-melt compounds as crystallization underlays for primary austenite and chromium carbides (inoculation process), depending on the selected cast iron chemical composition [1,2,3,4,5,6,7,8,9]. Their use increases the number of eutectic colonies in the microstructure, with carbides featuring more favorable morphologies. Previous studies have shown that the high melting point of TiC allows its formation before the crystallization of
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
