A Novel Objective Method for Steel Degradation Rate Evaluation.

Area of Science:

• Materials Science
• Metallurgy
• Non-destructive Testing

Background:

• Power plant components are susceptible to microstructural degradation due to creep processes during extended operation.
• Accurate assessment of this degradation is crucial for ensuring component integrity and operational safety.
• Traditional methods for microstructure analysis are often destructive, limiting their application in operational diagnostics.

Purpose of the Study:

• To introduce and validate a novel, non-destructive method for assessing microstructural degradation in power plant components.
• To compare the accuracy of the proposed matrix replica technique with conventional destructive metallographic analysis.
• To evaluate the quantitative microstructure parameters obtained from replicas using stereological principles and image analysis.

Main Methods:

• Development of a non-destructive matrix replica technique for capturing surface microstructures.
• Quantitative analysis of microstructure parameters (mean chord length, relative surface area, etc.) using image analysis and stereology.
• Comparison of data obtained from matrix replicas against conventional metallographic specimens.

Main Results:

• The matrix replica method demonstrated high accuracy in reproducing the microstructure of power plant components.
• Quantitative microstructure parameters derived from replicas closely matched those from destructive metallographic specimens.
• The non-destructive approach provides reliable data for assessing creep-induced degradation.

Conclusions:

• The matrix replica method is a validated, non-destructive technique for evaluating microstructural degradation.
• This approach offers a valuable tool for diagnostics in power plant operations.
• Future work should focus on integrating visual methods with artificial intelligence for enhanced microstructure assessment.