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Thermodynamic Stable Metal Compositions

#2942


Thermodynamic Stable Metal Compositions for Improvement of an Operational Safety of Constructional Materials under Conditions of Multifactor Loadings of an Aggressive Environment

Tech Area / Field

  • MAT-SYN/Materials Synthesis and Processing/Materials
  • FIR-MAT/Materials/Fission Reactors
  • MAN-TRI/Tribology/Manufacturing Technology
  • MAT-ALL/High Performance Metals and Alloys/Materials

Status
8 Project completed

Registration date
02.12.2003

Completion date
01.06.2008

Senior Project Manager
Tyurin I A

Leading Institute
VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Supporting institutes

  • MIFI, Russia, Moscow

Collaborators

  • Ceramatec Inc., USA, UT, Salt Lake City\nUniversity of Oklahoma / Institute for Science and Public Policy, USA, OK, Norman

Project summary

Currently the requirements on operating safety and durability for the industrial constructional materials, which are frequently applied under conditions of the multifactor loadings (ionizing radiations, corrosion environment, mechanical attrition and others) are greatly increasing.

There are materials operating in different climatic conditions, the constructional materials of spacecrafts and air transport, nuclear facilities, the first shell of nuclear reactors, the containers and storehouses with the radioactive solid and liquid waste, the reactor materials of different assignment, and also other branches of industries. The combination of the high physical and mechanical characteristics and specific properties, in particular, radiation resistance and wearing capacity (durability), thermal stability and heat-resistance, liquid metal corrosion resistance and etc. is the most essential requirement of their application.

However such combination of the requirements cannot be always reached by the traditional methods of smelted steels and alloys doping and, besides, it is frequently required mainly for working surface of designs, machine component parts and devices.

The most perspective and technically feasible solution of these problems is the development of constructional material compositions (specific surface alloy) by the ionized fluxes of transition metals of IV-VI groups at rather low energy levels of 0.3 – 1.5 KeV.

It is especially relevant for steels, which are widely applied in industry, but due to their properties are mainly intended for perception of the mechanical power loads.

This project belongs to a category of applied researches.

The project goal is the improvement of safety of constructions and extension of the fields of application of constructional materials under the conditions of multifactor loadings of an aggressive environment.

Development of iron (steel) model compositions (special surface alloy of iron (steel) system, i.e. ionized metal) will give additional complex of physical and mechanical and specific properties to the industrial materials and will open new opportunities for their application as materials of the future.

It is supposed to supply thermodynamic stability of compositions by the directional formation of the structure allowing excluding physical demarcation and also by control of the composition of the surface alloys. This method is implemented in energy range between energies of deposition and an implantation of alloying (doping) ions.

Principal directions of investigations are:

- Study of the mechanism of interaction of the ionized fluxes of metals of groups IV - VI with iron and its alloys and development of models (program of processes simulation) of surface alloys formation by the ion fluxes of metals of groups 4-6 with energy of 0.3 – 1.5 KeV.

- Development of software on control of the surface alloys composition forming by the ionic fluxes of metals.

- Study of peculiarities of formation of the surface alloys on a basis of iron and estimation of influence of the alloying elements (molybdenum, tungsten, vanadium, chrome, cobalt and carbon).

- Determination of the theoretical background of the justification of models of iron (steel) compositions - specific surface alloy.

- Analysis of the possibility to apply the obtained results for nickel and cobalt alloys.

- Development of the procedures for study of special properties of model compositions.

- Development of composition model of iron (steel) type - special surface alloy and study of their properties concerning aggressive impact of environment (corrosion in liquid-metal medium and aggressive liquids, the ionizing radiations, and also attrition).

- Development of the programs on simulation of interaction of the ionizing radiations with the surface alloys of systems iron (alloy) - ionization metal.

- Selection of the research area for formation of the surface alloys in the industrial materials on the basis of iron and composition developments.

- Implementation of comparative trials of the mechanical properties of the samples of the model steel and the composition of model steel type - ionized metal.

The new approaches to a surface doping and development of materials with required properties that cannot be obtained by classical alloying technique are the basic novelty of the suggested solutions.

Further development of the project will concern implementation of the designed models in the procedures and technological approaches of formation of the special surface alloys on the basis of industrial constructional materials.

Project participants have significant potential and operation experience in the field of material technology, solid-state physics, the metal chemistry, and radiochemistry, physical and chemical analysis. In some papers of the project participants there are positive results on these project problems for special cases that confirms the urgency of implementation of full-scale studies.

The developed models of compositions will allow improvement the physical and mechanical characteristics of the industrial materials, will allow forecasting their operation in different spheres and formation of working surfaces with the given properties.

Project results are perspective in the development of the reactor materials technology, shielding materials, corrosion resistant and attrition-resistant materials, and thermostable materials for the liquid metal mediums.

The scientific and technical items mentioned in the project are of practical interest for material technology centers of USA, Europe and Japan, and for organizations engaged in the problems and perspectives of atomic power engineering. Information interchange with foreign collaborators, discussion and co-publication of the obtained results are assumed during the project implementation.


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