The effect of combined additions of Ti and Nb on structure and strength of cast HH steel after aging at 1173K for 1000h

Cast heat-resistant HH stainless steels are particularly suitable for application where service conditions comprise high temperature; thus, they are extensively used in metallurgical furnace. The demand for better performance has motivated developments in these steel. In this work Ti and Nb was added to cast HH steel simultaneously. It was observed that its presence increased the level of fragmentation of the chromium carbides, a positive aspect for mechanical properties. Microstructures and mechanical properties confirmed that G phase transformation depend on Nb/Ti ratio, %W, in HHmodified with Nb and Ti.

کلیدواژه ها:

Heat resistant Steel ، Chromium Carbide ، G-Phase ، Niobium ، Titanium