Optimal Parameters of Q&amp;P Heat Treatment for High-Si Steels Found by Modeling Based on “Constrained Paraequilibrium” Concept

Zurnadzhy, V. І.; Zaichuk, Natalia; Сергеев, А. В.; Chabak, Yu. G.; Ефременко, В. Г.

doi:10.1007/978-3-030-22365-6_49

Cited by 1 publication

(2 citation statements)

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“…Plastic deformation in the material when applying the thread promotes periodic zones with tensile and compressive stresses with increased dislocation density (% 1Á10 12 cm -2 ). The possibility of forming and propagating cracks in the cut made by the rolling method is more significant than in the manufacture of threads by cutting [20]. The results of studies of the material HX -Alloy Type 66Ni-17Cr, conducted using an X-ray machine DRON-3M in iron radiation, show that the density of dislocations during rolling is more than twice as high as the density of dislocations during cutting.…”

Section: Resultsmentioning

confidence: 99%

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Improvement of Operating Properties of Heat-Resistant Alloys by the Structure Optimization

Zaichuk

Shymchuk

Tkachuk

et al. 2021

Lecture Notes in Mechanical Engineering

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Fasteners of aircraft gas turbine engines are made of heat-resistant steels and alloys and are operated in intensive conditions under the action of high temperatures. For ensuring reliability, the connecting elements of aircraft engines are made of heat-resistant alloy steels. But under the influence of an aggressive environment, these elements are destroyed, resulting in problems during repairs. The structure of the material of fasteners during the threaded connection by cutting and plastic deformation is considered. The concentration of stresses in the thread plane depends on the density of dislocations, and the depth of corrosion penetration on the outer surfaces of the thread reaches 100 lm. It is proposed to introduce additional heat treatment of parts to improve the physical and mechanical characteristics of the alloy. After additional heat treatment, the r-phase plates dissolve and prevent the development of microcracks. It is proved that the density of material dislocations in the state of delivery reaches critical values, but the introduction of additional heat treatment allows to increase the performance of parts made of alloy HX -Alloy Type 66Ni-17Cr regardless of the method of threading. Prerequisites for the rational selection of heat treatment modes have been developed, which provide the best mechanical and technological characteristics and the necessary structure of the materials used.

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Section: Resultsmentioning

confidence: 99%

“…The DRON-3M unit was used for such studies. For determining the macro stresses in the test material, the X-ray diffractometric method was chosen, based on the exact determination of the deformation of the crystal lattice, because this express method has the following advantages: it is non-destructive and non-contact [20].…”

Section: Literature Reviewmentioning

confidence: 99%