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Metal Casting Technologies : March 2011
Supercharge Your Green Sand System Green sand systems wor harder and last longer with TRUBOND®. These sodium bentonite grades mull in quic ly and undergo a controlled hydration to develop a stronger, more elastic adhesive. TRUBOND delivers excellent green compressive and hot strength properties and maintains its wor ing bond in repetitive exposure to high heat loads and metal temperatures. SODIUM BENTONITE For more information and availability: ContactUs@metalcaster.com ® TRUBOND is a registered trademar . All rights reserved. ©2011 Figure 7. Some effects of surface condition and imperfections on fatigue in pearlitic ductile iron  In addition there may be undesirable variations in both composition and metallurgical structure in the surface regions, e.g. decarburization in a steel or cast iron, which may reduce fatigue resistance. Hence for all components whether cast or wrought, their surface condition and microstructure are both extremely important together with the component design. Any feature which causes a notch effect  (i.e. stress concentration) such as surface imperfections, rough machining marks or undercuts, scratching damage, and stamped identification marks must be avoided. Design and production must avoid sharp changes in section and fillet radii must be generous. Figure 7 illustrates the effects of surface condition on fatigue behaviour in a pearlitic ductile iron . A study  of the effects of surface and internal defects in ferritic ductile iron has shown that, in both cases, the observed fatigue limit can be related HENCE FOR ALL COMPONENTS WHETHER CAST OR WROUGHT, THEIR SURFACE CONDITION AND MICROSTRUCTURE ARE BOTH EXTREMELY IMPORTANT TOGETHER WITH THE COMPONENT DESIGN.