Nodularity Inspection of Ductile Cast Iron Automotive Components
As the use of nodular graphite iron material has expanded in recent years for automotive safety parts, ultrasonic velocity measurement is providing a reliable, industry accepted means of verifying material integrity.
Unacceptable degrees or variations in Nodularity, a type of graphite structure than can develop during the production process, can attenuate the velocity of sound waves passing through the material.
The Echomac® VM, measures this sound velocity, and using known limits, reports whether the part is acceptable.
About Nodular Cast Iron:
- When graphite takes the form of spherical nodules, the result is nodular cast iron.
- Nodular cast iron is softer and more malleable than gray cast iron.
- The relative high strength and toughness of nodular cast iron provides advantages in many structural applications including automotive crankshafts, pistons and cylinder heads.
- Microscopic examination and tensile strength tests are effective for checking nodularity, but they take time and are destructive.
- The Echomac® VM is a simple, effective instrument that measures velocity to assess nodularity in ductile iron cast automotive components.