Creep rupture properties and microstructures of 9Cr–3Co–3W-Nd-B steel welded joints

The creep rupture properties of welded joints and microstructures before and after creep rupture were evaluated for the 9Cr–3W–3Co-Nd-B steel, and simulated HAZ test was conducted to evaluate the creep strength and microstructures of HAZ. The creep strengths of welded joints were almost equivalent to the average strength of base metal, and the welded joints ruptured in HAZ in a similar manner as conventional steels in low-stress tests. The...