Ultrasonic velocity measurements for estimation of grain size in austenitic stainless steel

✍ Scribed by P. Palanichamy; A. Joseph; T. Jayakumar; Baldev Raj

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 615 KB
• Volume: 28
• Category: Article
• ISSN: 0963-8695
• DOI: 10.1016/0963-8695(95)00011-l

✦ Synopsis

Ultrasonic velocity measurements have been used to estimate average grain size in an AISI type 316 stainless steel. For precise ultrasonic transit time measurements, the pulse-echo-overlap technique has been used. Master graphs relating ultrasonic velocity with metallographically obtained grain size have been generated. Using these graphs, grain sizes in new specimens have been obtained. The results indicate that grain size can be predicted with good confidence level using ultrasonic velocity measurements. Shear waves are found to be more sensitive for grain size measurement, as compared to longitudinal waves. The grain size estimated by velocity measurements is found to be more accurate when compared to that obtained by attenuation measurements.