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Characterizing Microstructural Evolution of TP304 Stainless Steel Using a Pulse-Echo Nonlinear Method.

Yichen Liu1, Xiongbing Li1,2, Guangdong Zhang1

  • 1School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China.

Materials (Basel, Switzerland)
|March 25, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a pulse-echo nonlinear method to monitor microstructural changes in TP304 stainless steel. Increased grain size due to annealing degrades performance and raises nonlinear parameters, indicating material degradation.

Keywords:
TP304 stainless steelabsolute nonlinear parameter measurementmicrostructural evolutionnonlinear acousticspulse-echo method

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Solid Mechanics

Background:

  • Tube/Pipe (TP) 304 stainless steel is vital in industry.
  • Microstructural changes can compromise the service safety of TP304 steel.
  • Evaluating microstructural evolution is critical for ensuring material integrity.

Purpose of the Study:

  • To propose and validate a pulse-echo nonlinear method for characterizing microstructural evolution in TP304 stainless steel.
  • To quantitatively determine the absolute nonlinear parameter, accounting for attenuation.
  • To correlate microstructural changes with nonlinear ultrasonic parameters.

Main Methods:

  • Development and application of a pulse-echo nonlinear ultrasonic technique.
  • Controlled annealing treatments to induce microstructural evolution in TP304 steel.
  • Metallographic analysis for grain size measurement and comparison with nonlinear data.

Main Results:

  • Annealing treatments led to increased grain sizes in TP304 stainless steel with extended annealing times.
  • Increased grain size correlated with performance degradation and a rise in nonlinear parameters.
  • The pulse-echo nonlinear method demonstrated ease of use and quantitative characterization capabilities.

Conclusions:

  • The pulse-echo nonlinear method effectively characterizes microstructural evolution in TP304 stainless steel.
  • Nonlinear parameters serve as reliable indicators of microstructural changes and material degradation.
  • This method offers a practical alternative to traditional transmission-through techniques for material evaluation.