INSTITUTE OF TECHNOLOGY OF METALS
  
 



LANGUAGE
  • Russian

  • INSTITUTE
  • Institute
  • Main directions of scientific research work
  • Structure
  • Contacts
  • Cooperation

  • DEVELOPMENTS OF THE INSTITUTE
  • Continuous casting
  • Freezing-up casting
  • Bimetals
  • Silumins
  • Simulation of casting processes
  • Water analog simulation of die casting
  • Electroslag casting

  • CORROSION
  • Development of diagnosis system of the metal surface damage
  • Development of prognosis system of the steel surface damage by the Light Section Profiling System (LSP system) in high-speed production process
  • Development of prognosis system of the steel bulk property claim by the magnetic detection method in continuous production process
  • Diagnosis system of quality control and process control by digital image analysis
  • Universal magnetic thickness gage
  • Development of anti-corrosive active polymer film for steel packing

  • COATINGS
  • Magnetic Impulse Hardening
  • Cladding
  • IMM (Induction Metallurgical Method) Surface Hardening
  • Thermal Spray Coating Process
  • Flame Spray
  • Detonation Flame Spraying
  • Nontransferred Plasma Arc Spraying
  • Electric Arc Spraying
  • Activated arc spray- Hypersonic metallization
  • High-Frequency Pulse Hardening of Surfaces
  • Wire Arc Coatings
  • Metallization Of Ferrites And Creation Of Fixed Compositions Ferrite-metal

  • TECHNOLOGIES AND EQUIPMENT
  • Equipment For Surface Metallization And Blazing Of Oxide Materials
  • for continuous casting of cast iron and nonferrous metals
  • for battery grid casting
  • for continuous casting of CuCl belt
  • Plant for continuous casting of copper, aluminum, gold, silver, solder wires
  • DEVEOPMENT OF THE INSTITUTE :: High-Frequency Pulse Hardening of Surfaces

            The proposed technology is designed for surface hardening of steel and cast-iron machine articles for enhancing their operational lifetime. The process includes rapid heating of the article surface by powerful high-frequency pulses and subsequent rapid self-induced hardening of the heated layer by heat release inward the metal. Formation of disperse hardening structures (martensite, carbide, etc.) increases hardness and wear resistance of the article. Equipment for changing typical HF generators with a power up to 200 kW to a continuous-pulsed operating mode and sets of special inductors were developed; technological processes of hardening of articles made of different types of steel and cast iron were elaborated.

            The steel-layer hardness reaches 65 HRC, and the hardening depth varies from 1.5 mm (generator frequency is 440 kHz) to 3 mm (generator frequency is 66 kHz).

            The efficiency of the process is up to 15 cm2 of the article surface hardened per second (with a generator power   of 60 kW).

     

            Industrial facility with a power of 60 kW for hardening of articles

            - Application fields

            Hardening of shaft surfaces, rollers, wheels, bodies of revolution, inner surfaces of sleeves, diesel cylinders, hardening of guides, frames, arbitrary surfaces, tools, stamps, cutting edges, articles of a curvilinear shape, etc.

            - Advantages

            − absence or very low warpage; lower shortness due to a plastic core and grain dispersion; possibility of local hardening of outer and inner surfaces of various articles; lower heating-energy expenses; engineering simplicity, easy automation.

            High-Frequency Pulse Quenching

            The process includes rapid heating of the hardened surface by a pulse high-frequency field with a subsequent quick self-quenching of the heated layer by heat transfer to cold deep material layers. This leads to formation of a martensite structure and grain dispersion, which increases the lifetime of treated parts.
    Basic technical characteristics:
            - Maximum hardness of the reinforced layer, НRС units – 65; Maximum depth of hardening, mm - 3.5; Maximum density of radiation flux, kW/cm2 - 102;
            - Maximum heating rate, K/s - 106; Production rate of the unit, cm2/min - up to 100.
            Range of products quenched: Shafts, bushings, friction couples, guides, internal surfaces, cranks, cutters, pinion gears, including long-length articles.

     

            Microphotographs of the St45 article surface before and after hardening

    Copyright © 2019 Institute Of Technology Of Metals Of National Academy Of Sciences Of Belarus