Creep resistance and structure of 10% Cr-3% Сo-2% W-0.29% Cu-0.17% Re steel with low nitrogen and high boron contents for unit components of coal power plants

The creep resistance and structure of 10% Cr-3% Сo-2% W-0.29% Cu-0.17% Re steel with 0.1% carbon, low nitrogen content and high boron content were investigated by creep rupture testing at a temperature of 650°C and stresses from 200 to 100 MPa applied in 20-MPa increment

Effect of warm rolling on grain refinement and mechanical properties of austenitic stainless steel

The deformation microstructures of a 316L - type austenitic stainless steel subjected to warm plate rolling at temperature of 300°C to different total true strains (ε) of 0.5, 1, 2 or 3 and their effect on the mechanical properties were studie

Structural evolution of P92-type martensitic steel during creep at 650 C

Microstructure and a dispersion of secondary phase particles were examined in P92-type steel after creep test at temperature of 650 ◦C and an applied stress of 80 MPa in grip, gauge and necked portions of specimens. The structural changes in the gauge and necked sections were characterized by transformation of the tempered martensite lath structure into relatively coarse subgrain one accompanied by the coarsening of M23C6 carbides and precipitation of the Laves phase. No significant effect of creep strain on particle coarsening was foun

Strain-induced Z-phase formation in a 9% Cr-3% Co martensitic steel during creep at elevated temperature

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 portion

On effect of rhenium on mechanical properties of a high-Cr creepresistant steel

Addition of 0.2% rhenium in the experimental steel improved the short-term creep strength at 650 C. Comparison of kinetics of tungsten depletion from the matrix in different high-Cr martensitic steels showed that rhenium in the experimental 10Cr-3Co-3W-0.2Re steel did not lead to retaining an increased amount of solute W in the ferritic matrix during both aging and creep at 650 C. At the same time, the precipitation of the high fraction of the fine Laves phase particles provided the effective particle strengthenin

Effect of tungsten on the temper brittleness in steels with 9%

The impact toughness and the structure of high-chromium martensitic steels with different tungsten contents are studied after tempering at 300 – 800°C. It is shown that when the tungsten content is increased from 2 to 3%, the temperature range of the irreversible temper embrittlement is widened and the impact toughness is decreased by a factor of

Effect of long-term creep on microstructure of a 9% Cr heat resistant steel

The effect of long-term creep at 600°C under 137 MPa on the microstructure of a P92- type steel was investigated. The microstructure after tempering consisted of laths with an average thickness of 400 nm. Dispersion of secondary phases consists of M₂₃C₆ carbides with an average size of 85 nm located mainly on lath, block and prior austenite boundaries and MX carbonitrides with average size of 31 nm homogeniously distributed throughou