Strength Properties Of Alloys Research Articles

The Influence of Thermocyclic Treatment on the Structure and Mechanical Properties of Pseudo-Alpha Titanium Alloys for Steam Turbine Blades

The influence of thermal cycling treatment of pseudo-α-titanium alloys OT4 and VT20 on their structural and substructural characteristics, as well as their mechanical properties is considered. A significant change in structural characteristics is established. This contributes to an increase in the strength properties of alloys with satisfactory ductility and high-temperature strength.

Investigation of the effect of ion implantation on the structure of the surface layer of VT20 titanium alloy

The effect of ion implantation of VT20 titanium alloys on their structural and substructural characteristics is studied. A significant change in structural characteristics has been established, which contributes to an increase in the strength properties of alloys with satisfactory ductility and heat resistance. This work was carried out as part of the state task of the Ministry of Science and Higher Education of the Russian Federation «The influence of magnetic fields and ion implantation on the structure, chemical composition and properties of titanium, aluminum alloys and elementary semiconductors».

The Influence of Incoherent Particle Size on Defect Structure and Strength Properties of Disperse-hardened Aluminum Alloys

In this paper, the mathematical modeling is used to study the influence of the incoherent strengthening nanoparticles ranging from nano- to micron size on the formation and development of the defect structure of disperse-hardened crystalline aluminum alloy during plastic deformation. It is shown that the formation and accumulation of different dislocations in the shear zone are determined by mostly the size of the strengthening particles. It is found that the strength properties of the alloy containing strengthening microparticles, lower with the particle size increasing within one volume fraction.

Effect of heat treatment on non-stationary modes on structure of pseudo-α-titanium alloys used for steam turbine blades

The effect of thermocyclic treatment of pseudo-α-titanium alloys OT4 and VT20 on their structural and substructural characteristics is considered. Signifi cant change in structural characteristics is established, this contribu tes to increase in the strength properties of alloys with satisfactory ductility and heat resistance.

Features of the Formation of Structure and Phases in Single-Crystal High-Temperature Alloys and their Effect on Mechanical Properties

Features of the structure and phase transformations in single-crystal nickel alloys 1, 2 after long high-temperature exposures were considered in this paper. The results and studies of the residual mechanical properties of alloys after exposure are given. Nanophase hardening of single-crystal heat resistant nickel alloys was also considered. The method of heat treatment of single-crystal high-temperature nickel alloys was developed based on the studies. It provides an increase in the strength properties of alloys by 20...30%, due to the formation of bulk nanophases (γn+ γ'n). The data obtained on structural and phase changes in high-temperature nickel alloys make it possible to evaluate the stability of the structural state of alloys.

Effect of Carbon Addition on the Microstructure and Properties of Unalloyed Titanium

The effect of carbon additions on the microstructure and properties of unalloyed titanium with 0.2 and 0.5 wt. % C has been studied. Carbon has been found to appear as TiC carbide in these alloys. Its presence translates into increase in allotropic transformation temperature as well as hardness and strength properties of alloys at the expense of reduction in its ductility. It has been demonstrated that these alloys can be subject to hot deformation, and with low carbon content also to cold deformation, and additionally strengthened by solution treatment.

Structure, phase composition, and strength properties of single-crystal nickel alloy bearing titanium and rhenium

The fine structure, phase composition, segregation inhomogeneity, and strength properties of alloy ZhS32-VI with Ta and Re additives are studied. The thermal stability of the alloy is analyzed after temperature holds and in service.

On the relation between the chemical composition and the strength of high-temperature deformable Al−Cu−Mg alloys under various kinds of static tests

1. The use of maximum values of the strength properties of alloys in state T1 (σГmax,σ0.2max) as an independent characteristic allows us to obtain general linear equations of multiple regression that describe the dependence of the strength properties of pressed bands after heating at 175°C on the chemical composition of alloys of the Al−Cu−Mg system with high (type D21) and low (VD17) Cu/Mg ratio. 2. Softening of all the studied alloys with various Cu/Mg ratios at 175°C for each kind of test is connected through the general equation with the content of individual alloying components in the alloy. In accordance with the strength properties exhibited in various kinds of test alloys, D19ch, VD17, and AK4-2ch are the best.

Effect of hafnium on the structure and properties of wrought nickel-base alloys

1. In nickel-base alloys hafnium enters into the composition of nitrides of the type Ti(C, N) and Nb(C, N), partially replacing atoms of titanium, niobium, and aluminum in nitrides TiN, NbN, and AlN, and it also enters into the composition of the solid solution and strengthening γ-phase. 2. Hafnium promotes an increase in the amount of MC type carbides with a high carbon content, a reduction in M6C carbides, and removal of carbide liquation in nickel-base alloys. 3. An excess amount of hafnium in alloys leads to formation of primary phases of the type Ni, (Hf, Ti)2, and secondary phases: lamellar phase Ni3 (Ti, Hf) and Ni3 (Nb, Hf). 4. In worked alloys hafnium refines grains and it retards grain growth in the temperature range 1100–1200°C. 5. Hafnium promotes an increase in the strength properties of alloys at 20°C, and it does not alter ductility. Optimum additions of hafnium lead to a marked increase in time to failure for alloys in the temperature range 700–800°C. 6. On adding small amounts of hafnium to alloys there is an increase in the resistance of the metal to cracking near the seam during welding and during heating of welded joints.