The present work evaluated the tempering temperature influence on microstructure, mechanical properties, and residual stresses of AISI 4340 steel. were measured by X-ray diffraction (XRD) sin2ψ method compared to magnetic Barkhausen noise (MBN). exhibited high tensile values after quenching, but a small relief was observed in treatments at 300 °C 400 °C, which also presented hardness decrease a...

In this work, AISI 4340 steel was produced by powder metallurgy. Samples were sintered at 1150?C for 90 min. and then cooled in the furnace. Except to those as-sintered condition, one of samples homogenized 1 h air. Other deformed temperature range 1150-930?C deformation rate 30 60% followed cooling sand, air water mediums. The grain size gradually decreased depending on or steel. Small grains ...