Microhardness and Elasticity Study of Fatigue Tested Weld Samples

Abstract

A chemical analysis of low-carbon steel St3sp was carried out and the arc welding process used, then probes proceeded to mechanical testing such as tensile test and low-cycle fatigue test. A total inclusion of weld defect in the specific welded sample and especially in the cyclic loading specimens has been discovered. A premature fracture was revealed below the plastic limit in some probes during the tension and low-cycle test. A micro structural examination and micro hardness measurements was done in order to determine the reason of fracture. To determine the heterogeneity in mechanical properties the elastic modulus distribution has been calculated due to relationship between the micro hardness and material strength.