Influence of intense dynamic action on the structure and properties of austenitic weld metal with nitrogen

Abstract

The effect of local high-speed intense dynamic action by a metal object (indenter) on the change in the structure of weld metal of high strength alloy steel welded with austenitic flux-cored wire with nitrogen is studied. It is established that after welding the weld metal structure consists of austenite and delta-ferrite (3 vol. %) with microhardness HV_0.1 200–250. After intense dynamic action weld metal is strengthened by a γ → ε → α’ mechanism due to work hardening and formation of deformation within the structure of α’-martensite in an amount of 10 vol.% and a small amount of ε‑martensite while maintaining the original amount of δ‑ferrite, and with an increase in microhardness by more than 1.7 times from the initial level.