Abstract

Grain size measurements using ultrasonic backscattering: The grain size of alloys is one of the key material properties that controls mechanical strength. The grain size is carefully controlled during processing to create the desired mechanical properties and reliability in the final component. Traditional metallographic grain size measurements are destructive, time consuming and labor intensive. In addition, they only sample a small region of a component and cannot be performed on every component. Ultrasonic scattering measurements are excellent at probing metal microstructures and providing grain size if appropriate theories exist. We developed software that unifies the entire process including the data collection, backscattering coefficient calculation, theoretical predictions, grain size calculation, and visualization. We will report on the accuracy of the grain size measurements which was within the aircraft engine industry standard of ±1 ASTM # for all samples with grain size below ~50?m including “blind” samples, whose grain size we did not know. We will also report on the precision of the grain size measurements in equiaxed nickel alloy based on a systematic parametric study of the effects of various measurement and analysis parameters.

How to Cite:

Panetta, P. D., Du, H. . & Hassan, W. ., (2019) “Grain size measurements using ultrasonic backscattering”, Review of Progress in Quantitative Nondestructive Evaluation .