Open AccessInfluence of annealing on the functional properties of the NiTi alloy produced by wire arc additive manufacturing
Author(s) -
Natalia Resnina,
I. A. Palani,
Sergey Belyaev,
Rashid Bikbaev,
Shalini Singh,
S.S. Mani Prabu,
S. Arul Jayachandran
Publication year - 2022
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/1213/1/012002
Subject(s) - materials science , annealing (glass) , nickel titanium , volume fraction , metallurgy , alloy , diffusionless transformation , martensite , dissolution , shape memory alloy , microstructure , composite material , chemical engineering , engineering
The influence of the annealing temperature on the recoverable strain variation on cooling and heating under a stress of 200 MPa was studied in the NiTi samples produced by wire arc additive manufacturing. The samples including the Ni-rich NiTi layer in the working length were annealed for 10 hours at various temperature from 450 to 600 °C. It is shown that an increase in annealing temperature leads to non-monontonic variation in the recoverable strain. This is caused by an increase in annealing temperature from 450 to 550 °C increases the volume fraction of Ni 4 Ti 3 precipitates. As a result, the volume fraction of the NiTi phase undergoing the martensitic transformation and recoverable strain decrease. An increase in annealing temperature from 550 to 600 °C leads to a dissolving the Ni 4 Ti 3 precipitates and formation of the Ni 3 Ti 2 precipitates that increases the volume fraction of the NiTi phase and the recoverable strain.