Bifilm Defects in Ti-Inoculated Chromium White Cast Iron

Area of Science:

• Materials Science
• Metallurgy
• Wear-Resistant Materials

Background:

• White chromium cast iron is a key wear-resistant material.
• Titanium additions to cast iron form titanium carbide (TiC) particles.
• TiC can act as a nucleation site for eutectic carbides and austenite.

Purpose of the Study:

• Investigate the effect of titanium inoculation on the microstructure and properties of 20% Cr white cast iron.
• Analyze the role of TiC particles in the crystallization process.
• Determine the impact of varying titanium content on wear and impact strength.

Main Methods:

• Experimental study on hypoeutectic white cast iron with 0.5%, 1%, and 2% titanium (Ti).
• Microstructural analysis to observe TiC particle distribution and defect formation.
• Mechanical testing to evaluate wear resistance and impact strength.

Main Results:

• Titanium inoculation and TiC formation enhanced wear properties.
• A significant decrease in impact strength was observed, particularly with higher Ti content.
• TiC particles agglomerated, leading to irregular distribution, micropore formation, and bifilm defects.

Conclusions:

• While TiC improves wear, excessive Ti leads to detrimental agglomeration and reduced impact toughness.
• Incorrect additive volumes negatively impact casting properties, affecting technological and economic aspects.
• Understanding TiC behavior is crucial for optimizing wear-resistant cast iron alloys.