Model of discontinuous plastic flow at temperature close to absolute zero

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	Contents
	Summary in Polish
	1. Introduction
	2. State of the Art
	2.1. Materials for Large Cryogenic Projects 2.1.1. Technological Areas 2.1.2. Fusion Reactors 2.1.3. Large Scale Tokamak 2.2. Discontinuous Plastic Flow (DPF) 2.2.1. DPF Description and Occurrence 2.2.2. Kinetics of DPF Phenomenon 2.2.3. Thermodynamic Background 2.3. DPF: Facts and Figures
	3. Motivation and Objectives
	4. Experimental
	4.1. Materials and Characterization 4.1.1. Chemical Composition 4.1.2. Steelmaking and Processing 4.1.3. Cold Working and Heat Treatment 4.2. Metallography 4.2.1. Sample Preparation 4.2.2. Microscopy 4.2.3. Observation Methods 4.3. Tensile Tests 4.3.1. Cryostat Structure 4.3.2. Specimen Design 4.3.3. Measurement Sensors 4.3.4. Data Acquisition System (DAQ) 4.4. Fatigue Crack Growth Rate 4.4.1. FCGR Specimen 4.4.2. Test Method 4.4.3. Data Processing
	5. Experimental Results
	5.1. Surface Analysis 5.1.1. Inclusions Content 5.1.2. Austenitic Structure 5.1.3. Grain Size 5.1.4. Carbide Precipitation 5.2. Tensile Tests 5.2.1. Materials Strength and Ductility 5.2.2. Analysis of Stress-Strain Curves 5.2.3. The DPF in Stress-Strain Curves 5.3. Supplementary mechanical tests 5.3.1. The FCGR 5.3.2. Fracture Toughness
	6. Constitutive Model
	6.1. DPF Multiscale Model 6.2. Numerical Algorithm 6.2.1. Initial State (A) 6.2.2. Elastic Deformation (B) 6.2.3. Plastic Deformation (C) 6.2.4. Serration - Drop of Stress (DI) 6.2.5. Serration - Jump of Strain (DII) 6.2.6. Relaxation (E) 6.3. Parameters
	7. Numerical Results
	7.1. Simulation Curves 7.1.1. Grade 316LN 7.1.2. Grade JK2LB 7.2. Data Comparison
	8. Discussion
	8.1. Thermo-Mechanical Coupling 8.2. Microstructural Evolution 8.3. Numerical Model
	9. Conclusions
	Bibliography
	List of Figures
	List of Tables
	A. Appendix
	A.1. Maple: Execution Group A.2. Maple: Parameters of 316LN A.3. Maple: Parameters of JK2LB