Development of lean alloyed austenitic stainless steels with a high resistance to hydrogen environment embrittlement
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| Main Author: | |
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| Format: | Thesis Book |
| Language: | English |
| Published: |
Bochum
RUB, LWT
2012
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Table of Contents:
- 1. Introduction
- 1.1. Environmental and economic scope
- 1.2. Hydrogen economy
- 1.3. State of the Art
- 1.4. Austenitic stainless steel as a suitable material
- 1.5. Goal of the present work.
- 2. Fundamentals
- 2.1. The hydrogen atom
- 2.2. The hydrogen atom in the iron lattice
- 2.3. Hydrogen embrittlement of austenitic stainless steels
- 2.4. Mechanisms of hydrogen-assisted fracture
- 2.5. Hydrogen entry and solubility
- 2.6. Effect of the microstructure on HEE
- 2.7. Mechanical effects on α’ –martensite transformation.
- 3. Thermodynamic calculations
- 3.2. Kinetic calculations
- 3.3. Materials supply
- 3.4. Chemical composition
- 3.5. Microstructural characterization
- 3.6. Mechanical testing
- 3.7. Ferrite equivalent measurements
- 3.8. Digital microscopy
- 3.9. Calculation of hydrogen diffusion distances
- 3.10. Secondary ion mass spectrometry.
- 4. Results
- 4.1. Materials of reference
- 4.2. Production of tensile specimens
- 4.3. Microstructure
- 4.4. Influence of alloying elements
- 4.5. Basis for alloy development: generation 1 (G1)
- 4.6. Thermodynamic based criterion: generation 2 (G2).
- 5. Discussion
- 5.1. Microstructure of 1.4307
- 5.2. Surface condition
- 5.3. Mechanical properties
- 5.4. Chemical composition
- 5.5. Alloy development
- 5.6. Cost efficiency and materials selection.