Abstract
The article presents results of studies on the effect of pre-lathed surface micro-relief on surface micro-hardness after ultrasonic plastic treatment, as well as the effect of ultrasonic treatment on structure and properties of surface layers of steels 20 and 40X. The effect of ultrasonic treatment processing modes on roughness and micro-hardness of the surface layers was studied. It is shown that roughness values as well as form of ridges and grooves, obtained by pre-lathing, effect the growth of micro-hardness values after ultrasonic plastic treatment.
Highlights
IntroductionUltrasonic plastic working (ultrasonic treatment) is a method of high impact to metal surfaces; the essence of the method is that a component surface after machining is treated with the instrument (a ball) vibrating with ultrasonic frequency [1,2,3,4,5].Ultrasonic plastic treatment causes formation of a modified layer, with a high concentration of dislocations and diffuse interface with the base material, on the surface; formation of dangerous stress concentrators and emergence of fatigue cracks slow down significantly in the surface layer; that blocks a development of fatigue processes [6,7,8, 17, 18].For practical application of ultrasonic treatment special ultrasonic equipment is used, that is the ultrasonic head, the ultrasonic generator and tools
Ultrasonic plastic treatment causes formation of a modified layer, with a high concentration of dislocations and diffuse interface with the base material, on the surface; formation of dangerous stress concentrators and emergence of fatigue cracks slow down significantly in the surface layer; that blocks a development of fatigue processes [6,7,8, 17, 18]
It is found that ultrasonic plastic processing ensures 2-2.5 times maximum micro-hardness increase, if roughness (Rz 15 mc for steel 20 and Rz 10 mc for steel 40X) with trapezoidal ridges and grooves, obtained after turning
Summary
Ultrasonic plastic working (ultrasonic treatment) is a method of high impact to metal surfaces; the essence of the method is that a component surface after machining is treated with the instrument (a ball) vibrating with ultrasonic frequency [1,2,3,4,5].Ultrasonic plastic treatment causes formation of a modified layer, with a high concentration of dislocations and diffuse interface with the base material, on the surface; formation of dangerous stress concentrators and emergence of fatigue cracks slow down significantly in the surface layer; that blocks a development of fatigue processes [6,7,8, 17, 18].For practical application of ultrasonic treatment special ultrasonic equipment is used, that is the ultrasonic head, the ultrasonic generator and tools. Ultrasonic plastic working (ultrasonic treatment) is a method of high impact to metal surfaces; the essence of the method is that a component surface after machining is treated with the instrument (a ball) vibrating with ultrasonic frequency [1,2,3,4,5]. The main parameters of ultrasonic hardening are: tool static pressure on the detail surface; rates of vibration movement, longitudinal and lateral feed; a number of strokes; tool dimensions and shape [1, 2, 3, 5]. The ultrasonic instrument size and shape both define the impact force and, thereby, the pressure on the in-process surface [4, 5]
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