Fracture manifestations of low-alloyed 2.6Cr-MoV steels under tensile test conditions in subtransition temperature range

The work deals with investigation of influence of alloying elements (Mo,V), impurities (P), and hydrogen on sharp-notch strength and the failure characteristics of low-alloyed 2.6CrMoV steels at the temperature of -80 deg C. After embrittling treatment, the steels show various failure modes, in dependence on both the P content and the content of the alloying elements. The sharp-notch strength of the steels increases and the area reduction decreases with alloying elements (Mo,V) addition. Phosphorus does not affect the sharp-notch strength essentially, but it affects the area reduction.