This book highlights the qualitative and quantitative sequential changes in microstructure of P91 steel under various stress and temperature conditions. The P91 alloy is an established material used under elevated temperature and stress in the components of thermal power plants. Temperature and stress levels for laboratory experimentation have been selected based on the true operating condition of a boiler. This book describes both full length as well as interrupted tests that were performed under given parameters. Subsequently, the microstructures, bulk hardness and NDE parameters (magnetic and non-linear ultrasonic) have been evaluated. For reliable data, the microstructures have been observed at different regions of creep exposed samples by different characterization techniques. This has been further followed by drawing co-relation between specific features like precipitate size variation with creep strain / creep time and so on. Given the contents, this book will be a useful reference for researchers and professionals working in the area of materials especially in thermal power plants.
Author(s): Rajat K. Roy, Anil K. Das, Avijit Kumar Metya, Avijit Mondal, Ashis Kumar Panda, M. Ghosh, Satish Chand, Sarmishtha Palit Sagar, Swapan Kumar Das, Amit Chhabra, Swaminathan Jaganathan, Amitava Mitra
Publisher: Springer-NTPC
Year: 2023
Language: English
Pages: 118
City: New Delhi
Acknowledgements
Contents
About the Authors
1 Metallurgy of P91 Steel
References
2 As-Received Pipe Details
2.1 Dimensions: Pipe and Creep Specimen
2.2 Material Composition
2.3 Mechanical Properties
3 Creep Testing Under Different Conditions
3.1 Creep Life of P91 Steel
3.2 Creep Curves
4 Micrograph Description
4.1 As-Received Pipe
4.2 Micrographs of Creep Interrupted P91: 550 °C Temperature and 200 MPa Stress
4.3 Micrographs of Creep Interrupted P91: 600 °C Temperature and 140 MPa Stress
4.4 Micrographs of Creep Interrupted P91: 650 °C Temperature and 100 MPa Stress
5 Effect of Creep Exposure on Material Behaviors
5.1 Precipitate Size Variation
5.2 Hardness Variation
5.3 Magnetic Parameter Variation
5.4 Nonlinear Ultrasonic (NLU) Parameter Variation
5.5 Conventional Ultrasonic Parameter Variation
Supplements
Brief Description of Experimental Methodologies
Sample Preparation
Creep Testing
Microscopy of Samples
Optical and Scanning Electron Microscopy
Transmission Electron Microscopy
Image Analysis
Mechanical Property Determination
Brief Description of NDE Techniques
Electromagnetic Method
Nonlinear Ultrasonic (NLU) Technique
