Actual Problems in Machine Building 2016 No. 3

Actual Problems in Machine Building. 2016. N 3 Materials Science in Machine Building ____________________________________________________________________ 428 MECHANICAL PROPERTIES AND FRACTURE MECHANISM OF THE EXTRUDED LOW-CARBON STEEL AT LOW TEMPERATURES Kovalenko N.D. , Junior Researcher, e-mail: nakalykay@mail.ru Ivanov A.M. , Ph.D. (Engineering), e-mail: a.m.ivanov@iptpn.ysn.ru Larionov Institute of the Physical-Technical Problems of the North of the Siberian Branch of the RAS, 1 Oktyabrskaya str., Yakutsk, 677891, Russian Federation Abstract The extrusion is made of low carbon structural steel. Conducted mechanical tensile test of samples and determined the mechanical properties of Fe360 steel in the initial state and after extrusion. A study of failure mechanism of steel in the initial and hardened state at positive and low temperatures. It is shown that the strength of steel Fe360 after extrusion is increased in 1,5...2 times, while the plasticity decreases in 2,5 times. As a result of the structure refinement in extrusion 673 K does not change the viscous mechanism of destruction in uniaxial sample tension, including at 213 K is established. Keywords steel, exstrusion, sample, temperature, mechanical properties, strength, plasticity, break, fractograph, fracture mechanism, viscous fracture Funding The work is done within the research project № III.28.1.1 program III.28.1 RAS.