Abstract
Mathematical models of the surface hardening of VT20 and OT4 titanium alloys by electrospark alloying have been developed. These models can be used in the design of technological processes for the manufacture of titanium blades for steam turbines.
Highlights
The development of power engineering, both in the Russian Federation and abroad, presupposes the ever wider use of turbine units of increased power, the steam pressure in which reaches 25 MPa, the steam flow rate is 500 m/s, and its temperature is 540° C.Power loads cause a complex stress state in the material of the blades, in addition, tensile stresses arise in them from the centrifugal force due to the high speed of rotation of the rotor
It is known that electrospark coatings applied on pseudo-α-titanium alloys have high wear resistance at temperatures up to 500° C and high corrosion resistance and can be used to increase the durability of turbine blades operating in a stream of superheated steam at high temperatures under conditions of drop impact erosional impact [1-19]
There is very little information in the literature on the use of electrospark alloying for hardening turbine blades made of titanium alloys
Summary
The development of power engineering, both in the Russian Federation and abroad, presupposes the ever wider use of turbine units of increased power, the steam pressure in which reaches 25 MPa, the steam flow rate is 500 m/s, and its temperature is 540° C. It is known that electrospark coatings applied on pseudo-α-titanium alloys have high wear resistance at temperatures up to 500° C and high corrosion resistance and can be used to increase the durability of turbine blades operating in a stream of superheated steam at high temperatures under conditions of drop impact erosional impact [1-19]. Taking into account the advantages and disadvantages of the electrospark alloying method, many enterprises are developing technological processes for strengthening (as well as restoration) of the leading and trailing edges of the working blades of the last stages of steam turbines using electrospark alloying [4-7]. To establish the dependences of the influence of factors and conditions of the technological process of electrospark treatment on the quality of coatings on titanium blades of steam turbines, it is advisable to use methods of mathematical modeling [9-14]
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