Title :
Influence research of ultrasonic processing on nature of plastic deformation on mesoscale level steel samples ST30
Author :
Korobkina, N.N. ; Panin, S.V.
Author_Institution :
Inst. of Strength Phys. & Mater. Sci., Tomsk Polytech. Univ.
Abstract :
The method of ultrasonic forging allows creating on a surface a hardened layer, which does not have a marked interface with a substrate. The presence of such a layer on a surface should not result in considerable effects of localization, but at the same time, due to high-density of defects in a near-surface layer in control of homogeneous development of plastic deformation as a whole according to specimen. Low-carbon steel ST30 was used. Hardening the surface was conducted on the one hand of a specimen under conditions of ultrasonic burnishing. Under used treatment conditions the depth of study of a near-surface layer revealed according to analysis of a microhardness, amounted to 180 microns. The tests for single-axis static stretching were conducted on the test facility "IMASH 20-7" with speed of stretching of 0.05 mm/min. With the usage of an optical and television measuring complex "TOMSC-1", the principle of operation which one is based on computer processing of the optical images of a surface, fields of vectors of displacement were plotted. The analysis of distribution of vectors of displacement constructed at overseeing for a surface of a lateral face was conducted. The character of plastic deformation at a mesoscale level was investigated
Keywords :
forging; microhardness; plastic deformation; steel; surface hardening; ultrasonic applications; IMASH 20-7; TOMSC-1; computer processing; hardened layer; high defect density; lateral face; mesoscale level; mesoscale level steel ST30; microhardness; near-surface layer; optical images; plastic deformation; single-axis static stretching; surface hardening; treatment conditions; ultrasonic forging; ultrasonic processing; Coatings; Degradation; Maintenance; Materials reliability; Materials science and technology; Mechanical factors; Physics; Plastics; Steel; Stress;
Conference_Titel :
Modern Techniques and Technology, 2000. MTT 2000. Proceedings of the VI International Scientific and Practical Conference of Students, Post-graduates and Young Scientists
Conference_Location :
Tomsk
Print_ISBN :
0-7803-5789-2
DOI :
10.1109/SPCMTT.2000.896092