The size and distribution of Cr(V,Nb)N (Z-phase) particles in a 9Cr-3Co-2W-0.6Mo-0.1Ni-0.2V-0.06Nb-0.1C-0.05N-0.005B steel subjected to creep rupture test during 11,151 h at 650 °C under an applied stress of 100 MPa were studied. The replacement of V-rich (V,Nb)(C,N) carbonitrides by Z-phase was accelerated by plastic flow as suggested by a comparative analysis of these particles in different portions of crept specimen, namely, the grip section, the portion of uniform elongation, and the necked portions. Coarse “hybrid” Z-phase particles evolved throughout the crept specimen by an in situ transformation mechanism. The strain-induced Z-phase nucleated on the V-rich (V,Nb)(C,N)/ferrite interfaces, leading to the formation of numerous Z-phase particles with dimensions less than 50 nm in the necked portion.

蠕变的9Cr-3Co-2W-0.6Mo-0.1Ni-0.2V-0.06Nb-0.1C-0.05N-0.005B钢中Cr（V，Nb）N（Z相）颗粒的尺寸和分布研究了在650°C下11,151 h在100 MPa施加应力下的断裂试验。通过对流动样品在不同部分（即握持部分，均匀的伸长率和颈缩部分。粗糙的“混合” Z相颗粒通过原位转化机制在整个蠕变样品中演化。应变诱导的Z相在富V（V，Nb）（C，N）/铁氧体界面上形核，从而导致在颈缩部分形成尺寸小于50 nm的许多Z相粒子。