UNSTRESSED LATTICE PARAMETER AND MICROSTRUCTURAL EVOLUTION IN ELECTRON BEAM WELDED MARTENSITIC STEEL

摘要

The F82-H modified martensitic steel is currently one of the best options for the first wall of the future fusion reactors. Martensitic steel samples of F82-H (0.1 C; 8 Cr; 2 W; 0.2 V; 0.1 Mn; 0.1 Si Wt %) have been electron beam welded. Stress and strain analysis by X-ray and Neutron diffraction were carried out at different distances from the weld centre (0; 1; 2; 3; 4 and 5mm). Strain and stress calculations requires the determination of the exact unstressed lattice parameter (d_o), which is discussed. Material characterization and also line 1 measurements by X-rays and Neutrons were performed. The F.W.H.M.(Full Width at Half Maximum) values measured by X-rays and neutrons coincide and can be compared to the micro-hardness profile.