Table 6.

Overall effects of heat treatment on repetitively scanned NiTi samples.

Positive Impacts	Negative Impacts
Precipitation of a high density of fine Ni4Ti3 precipitates at a lower heat treatment temperature of 400 °C	Initiation of particle agglomeration and formation of dislocations with increasing heat treatment temperature from 500 to 700 °C
Improvements in the transformation strain (from 3.37 ± 0.19 to 3.59 ± 0.17) and shape recovery percentage (from 0.66 ± 0.04 to 0.72 ± 0.04) of repetitively scanned NiTi samples	Occurrence of strain-induced boundary migration with the implementation of heat treatment and with rising heat treatment temperature from 400 to 700 °C