effect of post weld heat treatment on the substructure and mechanical properties of ultra strength low alloy steel CrMnSiNI

int this research the effect of heat treatment on the substructure and mechanical properties of weld zone of CrMnSiNi ultra strength low alloy steel with 0.3%C Ms=316C with two different fillers and with TIG technique has been considered for this purpose first the effect of quench and temper heat treatments at 220 C AND 260C ,Isothermal quench and austempering at 280 C on base metal considered . welding parameters on all samples kept constant after assurance about soundness of weld the upon heat treatment cycles were applied on welded samplde for considering of the effect of heat treatment cycles optical metallography and SEM metallography tensile impact and hardness tests was applied on samples.

Keywords:

ultra high strength low alloy steel , welding , heat treatment , preaheat , martenzite , bainite