Open AccessEffect of electric pulse treatment on the structure and hardness of nickel deformed at room and liquid nitrogen temperatures
Author(s) -
Rafis Ilyasov,
A. Kh. Valeeva,
I. Sh. Valeev,
Oleg Sitdikov,
М. В. Маркушев
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1008/1/012006
Subject(s) - liquid nitrogen , materials science , nickel , isothermal process , nitrogen , recrystallization (geology) , metal , metallurgy , grain size , atmospheric temperature range , composite material , analytical chemistry (journal) , thermodynamics , chemistry , paleontology , physics , organic chemistry , chromatography , biology
The influence of the energy of electro-pulse processing (EPP) on the structure and hardness of pure nickel deformed at room and liquid nitrogen temperatures is studied. The metal was subjected to isothermal rolling with a strain of 90% and subsequent EPP with integral current densities Kj in the range from 0.06 to 0.19×10 5 A 2 s/mm 4 corresponding to the calculated temperature range of 130-925°C. It was found that decreasing the rolling temperature of Ni resulted in a more uniform and less misoriented nanocellular structure and a 15-20 HV higher hardness. Subsequent EPP decreased the hardness due to recovery, discontinuous recrystallization with the formation of annealed twins and growth of new grains. It is revealed that a more uniform fine-grained structure with a smaller grain size is formed in the cryorolled metal in a narrower interval and at less EPP energies.