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 tantalum on the tensile properties of 12%Cr martensitic steels for steam blades

Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=2530 MPa

Degradation of the creep resistance of a Re-containing 10% Cr steel upon creep testing at low applied stress

New Re-containing steel is a promising material for steam blades of fossil power plants worked at ultra-supercritical parameters of the steam. This steel was subjected to creep testing at 650°C under the applied stresses ranging from 200 to 100 MPa. The steel exhibits excellent creep resistance at high applied stresses; the time to rupture comprises 10,987 hours after the creep test at 650°C/140 MP

The gene-expression profile of renal medulla in ISIAH rats with inherited stress-induced arterial hypertension

Metabolic pathways enriched with genes differentially expressed in ISIAH and WAG renal medulla. (XLS 41 kb

Effect of the quenching temperature on the creep resistance of 9% Cr-1% W-1% Mo-V-Nb martensite steel

The creep resistance of the 9% Cr-1% W-1% Mo steel subjected to quenching from the temperatures of 1050 and 1150°C, cooling in the air, and further tempering at a temperature of 750°C for 3 h has been studied at a temperature of 650°C and applied stresses of 160, 140, and 120 MPa. An increase in the quenching temperature from 1050 to 1150°C leads to a growth in the average size of prior austenite grains from 25 to 93 μm due to the dissolution of MX carbonitride particles enriched in niobium under exposure in the austenite regio

Evolution of the tempered lath structure of the 12% Cr steels with low N and high B contents during creep

9-12% Cr martensitic steels are promising materials for elements of boilers, tubes, pipes, heaters and steam blades for fossil power plants, which are able to operate at ultrasupercritical parameters of steam. Creep tests were carried out for two 12% Cr and 9% Cr steels at 650°C. After tempering at 750-770°C, a tempered lath structure was revealed in all the steels studied. The 12% Cr-Ta steel had the smallest lath width among the steels studied that provided the longest creep rupture time after creep test at 650°C/120 MPa. During creep, the applied stress causes the lath growth and the formation of subgrains instead of martensitic lath

Effect of tantalum on short-term creep of a 12%Cr-3%Co-0.07%Ta martensitic steel for steam blades

9-12%Cr martensitic steels are prospective materials for elements of boilers, tubes, pipes, heaters and steam blades for fossil power plants, which are able to work at ultrasupercritical parameters of steam. Decreasing N content and increasing B content together with increasing Cr content required the optimization of ferrite-stabilizing and austenite-stabilizing elements to avoid the formation of δ-ferrite at high temperature