Abstract
The main objective of this investigation has been to study the influence of the heat affected zone (HAZ) on room temperature low cycle fatigue (LCF) properties of two structural steels, type SA 508 Class 2 and DIN 22NiMoCr37. The predicted LCF properties of the HAZ have been related to the corresponding material microstructure obtained under quenched and tempered conditions. The HAZ microstructure has been reproduced by a weld cladding simulation heat treatment and any subsequent heat treatment on the simulated HAZ microstructure has been omitted. Although the thermal cycle introduced by the simulated welding process modifies the structure of the affected region and, as a result, diminishes the monotonic and cyclic ductile properties, it has been found that the cyclic strength properties of the simulated HAZ microstructure have been increased. The Feltner and Landgraf prediction criterion has been applied in order to obtain a reliable estimation of the LCF resistance of the materials tested in this investigation.
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