Influence of chemical compositions and creep test conditions on UK R5 creep ductility parameter lambda of W-Mo-balanced 9Cr steel

The influence of boron nitride (BN) particles, W and Mo concentrations and creep test conditions of stress, temperature and test duration on the creep ductility parameter λ in UK R5 has been investigated for five heats of W-Mo-balanced 9Cr steel with 1.5% Mo equivalent at 600, 650 and 700 oC. With increasing time to rupture tr, the λ at first decreases only a little bit, then increases for up to a time showing a maximum peak and finally...