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Ultrasonic hardness testing

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onlinemetallurgy.com

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Ultrasonic hardness testing

  1. 1. For more help contact me Muhammad Umair Bukhari Engr.umair.bukhari@gmail.com http://onlinemetallurgy.com
  2. 2. What is hardness ? Different fields have different concepts In metallurgy “the resistance to indent formation or penetration is called hardness”.
  3. 3. Why hardness testing? It is done mainly for two reasons: • For research purpose • For application purpose
  4. 4. How to measure hardness? There are some well known following methods; o Brinell hardness (HB) o Rockwell hardness (HRC) o Vicker hardness (HV) o Ultrasonic hardness (UCI) Note: there is no conversion of one scale to another.
  5. 5. Ultrasonic Hardness • Basic principle: In UCI material is indented by converting electronic frequency into mechanic force and the indentation area size is calculated as a function of electronic frequency.
  6. 6. Process description • It is the modified form of Vicker’s hardness testing • Ultrasonic frequency is converted into mechanical force/vidration by Piezo transducer • And the frequency shift is measured with Piezo reciever • Material is indented with Vicker’s oscillating diamond-tipped rod
  7. 7. Continue…… • Rod is oscillated at a particular frequency • Material is indented with a constant force • All the process completes in very short time
  8. 8. Continue…. • Vicker hardness equation HV= F/A above equation is modified for ultrasonic frequency shift
  9. 9. Piezoelectric Material: • A piezoelectric sensor is a device that uses the piezoelectric effect to measure pressure, acceleration, strain or force by converting them to an electrical signal.

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