Influence of molybdenum addition on mechanical properties of low carbon HSLA-100 steel

Abstract

The results of mechanical properties and microstructure observation of low carbon copper bearing steel with high addition of molybdenum are presented in this paper. This steels were characterized by contents of molybdenum in the range from 1, 02 to 2.94% wt. After the thermo-mechanical processing the steels were subsequently quenched and tempered in the temperature range from 500°C to 800°C for 1h. The changes of mechanical properties as function of tempering temperature were typical for the steel with the copper addition. The sudden drop of impact resistance after tempering from 575°C to 600°C was caused probably by precipitates of Laves phase of type Fe2Mo.