Reversible Changes in the Coercivity of Alloys of the Fe – Cr – Co System Under Cyclic Heat Treatment

Metal Science and Heat Treatment - Reversibility of magnetic properties of a Fe – Cr – Co-base alloy detected under heating of optimally designed specimens to the temperature of...     

The Effect of Heat Treatment on the Fe—Sn Alloy System

The diffusion reaction of tin into pre-flow melted bright tinplate has been studied. It has been shown that the power index for the diffusion of tin to form the intermetallic layer increases from approximately 2 below 232°C to 5.6 at 350°C. Furthermore, the rate constant for alloy formation increases from 1 at 100°C to 331 at 225°C and to 2 × 10⁶ at 250°C. At 350°C it reaches 6.3 × 10⁶. The activation energy for the formation of FeSn₂ is reducedfrom 19 kJ mol^?1 K^?1 for temperatures below the melting point of tin, to 7 kJ mol^?1 K^?1 for those above the melting point. Evidence for the presence of iron—tin alloys other than FeSn₂ is also presented. These alloys are only formed when the processing temperature exceeds 350°C and all the free tin has been depleted. These results provide a better understanding of the diffusion reaction between tin and iron when hot processing is used on tinplate and can be used to give better control to some processes. This improved control will minimise the adverse affects of heat treatment of tinplate that can result in both greying of the surface and maximise the amount of tin that can be reclaimed from scrap used tinplate.     

Effect of Casting Method on Phase Composition of Heat-Resistant Austenitic Alloys Based on the Fe – 25% Cr – 35% Ni System

Metal Science and Heat Treatment - Methods of optical and electron microscopy and x-ray spectrum microanalysis are used to study the microstructure and the phase composition of alloy HP40NbTi...     

Composition and Operating Properties of Hard Magnetic Materials Based on Alloys of the Sm – Co – Cu – Fe – Zr System Obtained with the Use of Recoverable Resources

Metal Science and Heat Treatment - Comparative studies of alloys of the Sm – Co – Cu – Fe – Zr system fabricated by vacuum induction melting from pure blend components and...     

Effect of Modes of Spark Plasma Sintering on the Structure and Properties of Materials of the Ni – Cr – Si – B – C System

Metal Science and Heat Treatment - The influence of modes of spark plasma sintering (SPS) on the structure and properties of a self-fluxing powder material of the Ni – Cr – Si – B...     

Effect of Radial Shear Rolling on the Structure and Mechanical Properties of a New-Generation High-Strength Aluminum Alloy Based on the Al – Zn – Mg – Ni – Fe System

Metal Science and Heat Treatment - A high-strength aluminum alloy based on the Al – Zn – Mg – Ni – Fe system is studied in deformed condition after radial shear rolling with...     

Corrosion Resistance of Materials Obtained By Electron-Beam Cladding of Fe – Cr – Ni – Ti Powder Mixtures

Metal Science and Heat Treatment - Corrosion resistance of surface layers of structural steel 12KhN3A modified with chromium, nickel and titanium using the process of non-vacuum electron beam...     

Effect of Plastic Deformation on the Structure and Properties of High-Nitrogen Alloys of the Fe – Cr System

The structure, strength, and ductility of alloys of the Fe – Cr – N system bearing from 15 to 24% chromium and from 0.4 to 1.3% nitrogen are studied after rolling at 20, 450, 800, 900, 1000, 1100, and 1200°C. It is shown that the highest hardening due to cold plastic deformation is provided in alloys with metastable -solid solution that undergoes transformation into strain martensite ( ). In hot plastic deformation the alloys are hardened due to the formation of a fragmented structure. The data of electron microscopic studies are used to determine the role of the phase composition in the hardening of the alloys.     

Role of Structural Factor in Elevation of Wear Resistance of a Ni – Cr – B – Si Coating after Laser Treatment

Metal Science and Heat Treatment - Metallographic studies and tests for abrasive wear resistance are performed for a Ni – Cr – B – Si coating obtained by laser powder cladding...     

Formation of Structure in Clad Abrasion-Resistant Alloys of the Fe – Cr – C – Mo – Ni – Ti – B System Under the Effect of Ultrafine Particles of Titanium Nitride

Metal Science and Heat Treatment - The behavior of the structure of abrasion-resistant alloys of the Fe – Cr – C – Mo – Ni – Ti – B system during electric arc...     

The Oxidation Behaviour of Alloys Based on the Ni–Co–Al–Ti–Cr System

The isothermal oxidation behaviour of a series of quinary Ni–Co–Al–Ti–Cr alloys were studied at 800 °C. Alloys with higher Cr concentrations exhibited lower mass gain after 100-h exposure, as did the alloys richest in Ni and Al for a given Cr concentration. Extensive internal oxidation and nitridation was also observed in all alloys, except those containing the highest concentrations of Ni and Al. All alloys studied generated continuous chromium oxide layers, beneath which alumina particles were observed. Compositional analysis of the subscales identified shallower Cr concentration gradients in alloys containing equiatomic levels of Ni and Co, suggesting increased availability of Cr in the alloy. Thermodynamic calculations confirmed that these alloys contained higher concentrations of Cr in their γ matrices as a result of a combination of both the elemental partitioning behaviour and the increased mole fraction of γ′ precipitates forming in the alloy.     

The Formation of Metal–Oxide Heterostructures at Low-Temperature Oxidation of Alloys Based on the Fe–18Cr System

Protection of Metals and Physical Chemistry of Surfaces - The oxidation kinetics and chemical composition distribution over the depth of the metal–oxide layer at low-temperature (300°C)...