Ductile Iron Front-End: Ultrasonic Nodularity Determination Using Standard Coupons: An innovative testing method has proven to be a viable and reliable tool of very low gage variation for the real-time process control of ductile iron nodularity

Ductile iron nodularity is critical to its quality, but nodularity determination by metallographic analysis can be problematic. The widespread practice of estimating nodularity via a comparator chart is highly subjective [...]