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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Operational degradation and competition of cleavage and intergranular failure
 Němec, Ondřej ; Dlouhý, Ivo
In present contribution, cumulative effect of metallurgic impurities and simulated operational degradation is analysed both resulting in intergranular embrittlement and fracture. For criteria formulation of critical and/or acceptable metallurgic impurities content the competition of two stress controlled fracture mechanisms is developed. When quantifying the impurities effect the characteristics of fracture surface morphology (fractal dimension) and critical fracture stress have been applied.
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Properties of steel for thick wal castings normalised from intercritical region
 Dlouhý, Ivo ; Chlup, Zdeněk
In the present work, the fracture resistance of ferritic C-Mn steel predetermined for the radwaste container cask is analysed. Because of necessity of the comparable microstructure obtaining throughout the wall thickness the steel was treated thermally by controlled cooling from intercritical temperature interval. The fracture behaviour assessment is based on standard fracture toughness determination; data obtained by instrumented impact tests of Charpy type specimens and static tests of pre-cracked Charpy type specimen have been also applied. For the last specimen geometry the problem of transferability of fracture mechanical data from small test specimens to full size specimens or components is solved.
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Fatigue life and short crack growth in plasma nitrided 316L stainless steel
 Obrtlík, Karel ; Polák, Jaroslav
Cylindrical specimens with shallow notch of 316L austenitic stainless steel both with plasma nitrided and untreated surface were cyclically strained with constant plastic strain amplitude. Fatigue life, crack initiation, short crack growth and stress response were studied in both materials.
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