[en] The paper presents the results of the first mechanical test campaign performed on some members of a new family of stainless steels. Tensile and creep tests have been carried out in order to acquire the first indispensable information about the mechanical properties and the micro-structural thermodynamic stability of Ti plus Nb stabilized austenitic steels. A more comprehensive test campaign has been in progress since May 87. Optimized chemical compositions and higher Ni content alloys will be tested too. (author)

[en] Gas tungsten arc welding and electron beam welding methods were used to realise welding pools on plates of reduced activation martensitic steels. Structural and mechanical features of these simulated joints have been investigated in as-welded and post-welding heat-treated conditions. The research allowed to assess how each welding technique affects the original mechanical properties of materials and to find suitable post-welding heat treatments. This paper reports results from experimental activities on BATMAN II and F82H mod. steels carried out in the frame of the European Blanket Project - Structural Materials Program

[en] Irradiation with 1 MeV electrons had demonstrated the high swelling resistance of DS (double stabilized) steels. Experimental results from a first generation of 316 and 15Gr-15Ni (Ti + Nb) austenitic steels gave evidence of some drawbacks associated with an unoptimized chemical composition. A critical analysis led to a revised DS family and a second generation based on two principal steels: 15Gr-15Ni and 15Gr-25Ni. The higher Ni content alloy has been extensively characterized and the test programme for the lower Ni content alloy is well advanced. The mechanical and structural properties are promising for use in fast breeder reactor cores at high burn up. (author)

[en] Welded joints of 25-mm thick plates of Eurofer-97, produced by a multi-pass GTAW + filler material method, have been investigated before and after different heat treatments to identify the temperature-time combination that gives mechanical properties as close as possible to those of the base material. After NDE (non-destructive examinations), samples were annealed in the temperature range 730-750 deg. C for 1 and 2 h, microhardness was measured across the joints and FIMEC (flat-top cylinder indenter for mechanical characterization) tests were carried out in the molten zone (MZ), heat affected zone (HAZ) and in the matrix. The FIMEC method allowed determination on a local scale of the yield stress as obtained in standard tensile tests. Mechanical tests were supplemented by optical microscopy observations. The best results were obtained by the treatment at 750 deg. C for 2 h: original characteristics are substantially recovered in the HAZ but not completely in the MZ

No abstract available

No abstract available

No abstract available

[en] In the present work, we have studied the strain rate sensitivity of tensile properties of TZM and Mo-5%Re alloys. Tests were performed at room temperature and around the transition temperature of each alloy, at strain rates varying over five decades. Ductility appeared insensitive to strain rate, whereas the strength is found to be strain rate dependent. Both proof stress and ultimate tensile strength are affected by strain rate and the Mo-5%Re alloy is more sensitive than TZM. As expected, the hardening decreases with temperature; in TZM alloy the strain rate sensitivity was apparent only at room temperature

No abstract available

No abstract available