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Transactions of the Indian Institute of Metals

, Volume 72, Issue 9, pp 2349–2358 | Cite as

Ultrasonic Detection of Microstructure Features in Ti-Alloyed Ductile Iron

  • Shimaa El-HadadEmail author
  • Mervat Ibrahim
  • Mohamed Mourad
  • Waleed Khalifa
Technical Paper
  • 24 Downloads

Abstract

Ultrasonic detection is used as a nondestructive testing method to check the quality of the ductile iron castings. In the current study, ductile iron was alloyed by Ti up to 0.3 wt% and the influence of alloying on the microstructure and graphite morphology was investigated using a step-like mold of 5, 10, 20 and 30 mm thickness. The results were then confirmed by microstructure investigation of the samples using ultrasonic waves. It was found that the speed of ultrasonic waves decreased from 5556 to 5452 m/s when Ti addition increased from 0.0 to 0.3 wt%, which decreased the nodularity from 80 to 45 at 30 mm thickness. Also the amplitude of the echoes decayed more rapidly with increasing Ti content. Referring to the microstructure changes with Ti addition, it was found that increasing Ti up to 0.3 wt% distorted the graphite nodules and decreased their count in the as-cast parts. This decreased nodularity resulted in the decrease in the speed of ultrasonic waves and affected their attenuation as well. It was concluded that the effect of changing the amount of Ti as alloying additive within a narrow range (0.0–0.3) could be successfully detected by ultrasonic waves without destroying the cast part for metallographic preparation.

Keywords

Ductile cast iron Alloying Microstructure Ultrasonic detection 

Notes

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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Central Metallurgical Research and Development InstituteHelwanEgypt
  2. 2.Department Mining, Petroleum and Metallurgical Engineering, Faculty of EngineeringCairo UniversityGizaEgypt

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