Impact toughness of a 10% Cr steel with high boron and low nitrogen

The effect of temperature on the impact toughness and fracture behavior of a 10% Cr-2% W-0.7% Mo-3% Co-0.05% Nb-0.2% V-0.008% B-0.003% N (all in wt%) steel was studied. The ductile-brittle transition (DBT) occurs at 10 °C. At the DBT temperature (DBTT), the onset of unstable crack propagation occurs at the maximum load. The mbrittlement is attributed to the onset of unstable crack propagation at stresses below the general yieldin

Effect of Laves phase on ductile-brittle transition of 12 Pct Cr steel

The impact toughness of a martensitic 12 Cr-0.6 Mo-2.2 W-4 Co-0.8 Cu-VNb (in wt pct) steel subjected to tempering at 770°C for 3 hours and aging at 650°C for 643 hours was examined in the temperature range of 20 to 250°C. The steel in the tempered condition exhibits a ductile-brittle transition temperature (DBTT) of 41°C and a Charpy V-notch impact energy of 100 J/cm2 at a temperature of 20°

Effect of tempering temperature on the microstructure and creep resistance of a 10% Cr martensitic steel

The tempered martensite lath structure of a 10% Cr martensitic steel after normalizing and tempering at 750 °C was studied. The effect of reducing the tempering temperature from 770 by 20 °C on the microstructural parameters in steel was shown. Tempering at a lower temperature of 750 °C provides thinner laths and finer M23C6 particles (55 nm) than tempering at 770 °

Measurement of tensor analyzing powers in deuteron photodisintegration

New accurate measurement of tensor analyzing powers T20, T21 and T22 in deuteron photodisintegration has been performed. Wide-aperture non-magnetic detectors allowed to cover broad kinematic ranges in a single setup: photon energy = 25 to 600 MeV, proton emission angle in CM = 24 to 48 deg. and 70 to 102 deg. New data provide a significant improvement of a few existing measurements. The angular dependency of the tensor asymmetries in deuteron photodisintegration is extracted for the first time.Comment: 4 pages, 5 figures, submitted to Phys. Rev. Let

The significance of retained austenite in the high strength and plasticity of medium carbon Q&P steel

The Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel treated by the quenching-partitioning partitioning process showed a product of strength and elongation of 30 GPa % with yield stress of 1350 MPa. Such a combination of high ultimate tensile strength and good ductility is attributed to a high portion of retained austenite (≥20%) transforming to martensite under tension. The high yield stress is provided by carbon supersaturation of austenite and a high dislocation density in this phas

MICROSTRUCTURE EVOLUTION DURING LCF OF A 10 % Cr STEEL AT AMBIENT TEMPERATURE

В работе рассмотрено влияние циклического нагружения на микроструктуру и микротвердость стали 10Х10К3В2МФБР при комнатной температуре и амплитудах деформации ±0,25 % и ±0,6 %.The influence of cyclic loading on microstructure and microhardness of a 10 % Cr steel with 3 % Co and 0.008 % B was examined at room temperature and total strain amplitudes of ±0.25 % and ±0.6 %.Исследование выполнено за счет гранта Российского научного фонда (проект №14-29-00173)

Increase of precision of casting blocks by applying acoustical oscillations in gas-impulsive moulding

The present article shows the results of the theoretical and empirical research of the study of the impact made by acoustical oscillations on the working process of a gas-impulsive moulding device with the purpose of increasing the quality of the casting blocks’ seal and decreasing the roughness of the surface of a casting block. It has been shown that acoustical oscillations intensify the working process of the gas-impulsive moulding device. With the increase of frequency and power of oscillations the hardness of a casting block first sharply rises, but then gradually decreases. It has been found out that oscillations may help to adjust the precision of a casting block due to high sensitivity of a gas-impulsive process to the frequency of oscillations. The use of acoustical oscillations broadens technological opportunities of the moulding device