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Home / Issues / № 2, 2014

Engineering

ACTION OF THE PULSATORY GAS FLOW ON THE STRUCTURE AND THE PROPERTIES OF THE METALLIC MATERIALS
Ivanov D.A.

In the construction of the machine parts and instruments widely adapt the hardened by quenching steel components, and also components from the thermo-hardened aluminum and titanium alloys, moreover the use of the latter has a tendency toward an increase. Their structural strength to a considerable degree depends on the heat working, which is been in the majority of the cases the completing stage of the production of components. At the same time, in the machines and the instruments widely adapt the metallic materials, not subjected the strengthened heat treatment.

As a rule, they are strengthened by cold plastic deformation, which draws reduction in the values of the indices of reliability. For the successful solution of the problems of industrial production it is necessary to have an idea about the contemporary tendencies in the practice of the strengthened of the treatment of similar materials both of the first and second group those of including using jet technologies.

Working metallic components by the pulsatory gas flow (gas-pulse working) - one of the new promising methods of increasing their structural strength of reduction in the metal content of machines and mechanisms, increase in the period of their operation, which can be applied both to the heat-treatable articles and to the components, not subjected strengthened heat treatment [1-4].

Influencing on the atomic structure, the mechanical waves, generated by the pulsations of gas flow, are capable of having an effect on structural strength of metallic materials.

Represents practical interest the possibility of increasing structural strength by the way of cooling heated down to the structure of austenite of steel with the subsequent gas-pulse working in the cold state, applied, including to the finished steel articles.

In the latter case it is possible to limit only to the blowout, which pulsates by gas flow at room temperature. The same relates also to the articles, subjected to standard hardening and low or high-temperature leave. Obtained experimental data demonstrate the possibility of replacement in the case of quenching with the low temperature tempering of articles made of structural steels of tempering heating by gas-pulse by processing, which ensures the considerable decrease of the time of thermal strengthening.

Also working by the pulsatory gas flow affects by positive means corrosion resistance of metalware. The given results make it possible to correctly select the position of article relative to gas flow with the gas-pulse the processing taking into account the direction of operating load. Is experimentally realized the process of the gas-pulse of the working of articles with the additional action of the hollow steel balls being varied in the pulsatory air flow, which facilitates an increase in its effectiveness.

The practical interest present the data about the positive influence of gas-pulse of processing on structural strength of aluminum and titanium alloys both heat-treatable, and not subjected the strengthened heat processing. It is established that the gas-pulse working ensures an increase in the mechanical properties of sheet rental from the alloys on the basis of copper, not subjected thermal strengthening. Gas-pulse working makes it possible to increase the durability of the metal cutting tool, including of finished.

The action of the pulsations of the air flow without the application of heating makes it possible to remove the undesirable stretching surface stresses of metalware, which decreases the risk of crack formation in the process of their operation. Thus, is promising the use of the pulsatory gas jets for the purpose of an increase in structural strength of the parts of metallic machines and instruments.

 



References:
1. Ivanov D.A. Air Pulse Treatment at Cooling Phase of Tempering Process Enhances Strength of Engineering Steel // DVIGATELESTROYENIYE. – St. Petersburg, 2005, № 4, p. 30-32.

2. Ivanov D.A., Zasukhin O.N. Gas-impulsive Treatment of Constructional Materials Without Pre-Heating // DVIGATELESTROYENIYE. – St. Petersburg, 2010, №2, p. 20-22.

3. Ivanov D.A., Zasukhin O.N. Controlled Gas Explosion Technology Combined with Thermal Treatment Improves Strength of Construction Materials // DVIGATELESTROYENIYE. – St. Petersburg, 2012, №3, p. 12-15.

4. Bulychyov A.V., Ivanov, D.A. Effect of gas-impulsive treatment on structure, properties and stress of metal products. // Technologiya Metallov (Technology of metals). – M., 2013, №11, p. 30-33.



Bibliographic reference

Ivanov D.A. ACTION OF THE PULSATORY GAS FLOW ON THE STRUCTURE AND THE PROPERTIES OF THE METALLIC MATERIALS. International Journal Of Applied And Fundamental Research. – 2014. – № 2 –
URL: www.science-sd.com/457-24638 (24.08.2019).