IMPACT OF SUBZERO HEAT TREATMENT ON SOME MECHANICAL PROPERTIES OF BIMETALS

Year 2023, Volume: 6 Issue: 2, 41 - 45, 31.12.2023

Zafer Özdemir

Abstract

Deep cryogenic (subzero) treatment (DCT) influence on the mechanical properties of bimetals used in the crushing industry has been examined and analyzed in the current study. Examinations include annealing at 800°C, DCT, tempering at 250°C, charpy impact test, optic microscope (OM) images analysis, scanning electron microscope (SEM) images analysis, X-RAY images analysis and hardness measurement as Rockwell C. Bimetals (2 set each, 1 set is 5 sample) are put to annealing at 800°C for 5 hours, then DCT is executed at -180°C for 24 hours. Tempering is followed out out at 250°C for 3 hours for 1 set. The impact toughness rates after DCT/Tempering and after DCT are found with the help of charpy impact tests. Hardness rates and metallography of test pieces are examined and compared. Noteworthy hardness and toughness rates are observed after DCT. It was also observed that after DCT/Tempering, hardness is reduced, but impact energy/toughness is increased. A clean microstructure has been observed after DCT in OMs and SEMs. X-RAY analysis also reveals a pure and clean chemical composition.

Keywords

subzero (deep) cryogenci treatment, bimetal, hardness, impact toughness test, high alloy cast iron, low alloy steel

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