Kinetics of Phase Transformations in Roll Steel 8Kh3SMF

Metal Science and Heat Treatment - The structure and the hardness of steel 8Kh3SMF after isothermal quenching at 200 – 700°C with a step of 50°C and holds for 20 – 5000 sec...     

Transformations,Structure and Properties of Steel 22Kh2G2S2MF Under Continuous Cooling

Metal Science and Heat Treatment - Transformations of structure in structural steel 22Kh2G2S2MF under continuous cooling are studied by the methods of dilatometric analysis and optical microscopy....     

Effect of Plastic Deformation and Heat Treatment on the Structure and Hardening of Nitrogen-Bearing Steel 0Kh16AN4B

Metal Science and Heat Treatment -     

Diagrams of Austenite Transformations and Heat Treatment of Steel 25Kh1MF

Isothermal and thermokinetic diagrams of austenite transformations in steel 25Kh1MF (ÉI10) are plotted and used to develop heat treatment modes providing the KP900 strength category.     

Effect of Preliminary Hardening on the Properties of Steel 15Kh16K5N2MVFAB

Modes of heat treatment of steel 15Kh16K5N2MVFAB used in commercial production of parts are considered. It is suggested to complement the process of heat treatment used by preliminary hardening and tempering. A comparative analysis of the mechanical properties, structure, and machinability of parts after the conventional and the suggested heat treatment variants is presented.     

Microalloying Effect of Sn on Phase Transformation During Heat Treatment in Mg–Y–Zn–Zr Alloys

The microstructure and mechanical properties of the as-cast and heat-treated Mg-4.6 Y-2.5 Zn-0.6 Zr-x Sn(x = 0, 0.2 and0.5 wt%) alloys were investigated in this work. The results showed that the eutectics have been refined with 0.2% Sn addition and it has no effect on the phase category of the alloys. However, Sn3 Y5 phase was found in 0.5% Sn-added alloy.After heat treatment at 520 °C, the transformation of the long-period stacking ordered(LPSO) phase takes place in the Mg-Y-Zn-Zr alloy, but the transition is not completed in the alloys containing Sn. In addition, during the heat treatment, the mechanical properties of Sn-free alloys are significantly improved, and the strength of alloys containing Sn does not change much. Through observation and analysis of the microstructure and mechanical properties, it is found that Sn addition hinders the process of a0-Mg ? a-Mg ? 14 H and the process is the key to the transition of 18 H-LPSO to 14 H-LPSO.     

Effect of High-Gradient Directional Crystallization on the Structure and Mechanical Properties of Corrosion-Resistant Nitrogen-Bearing Martensitic Steel 08Kh14AN4MDB

A comparative study of the structure and properties of corrosion-resistant nitrogen-bearing martensitic steel 08Kh14AN4MDB produced by methods of high-gradient directional crystallization (HGDC) and traditional crystallization is performed. The method of HGDC ensures considerable disintegration of the structural components of the steel and lowers the dendritic segregation of the alloying elements. The metal with such structure possesses enhanced strength and ductility.     

Special Features of Formation of Structure and Properties of Low-Carbon Martensitic Steel 12Kh2G2NMFT

The structure and mechanical properties of steel 12Kh2G2NMFT after continuous cooling at a rate of 600 – 0.035 K/sec and after cooling with isothermal holds in a temperature range of 300 – 650°C are investigated. It is shown that a lath martensite structure with a high level of strength and ductility is formed in a wide range of cooling conditions. The decrease in the impact toughness observed under isothermal conditions in a narrow temperature range below M _i (360 – 410°C) is shown to be connected with the processes of tempering of freshly formed isothermal martensite.