Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels
The effects of different heat treatment processes on the microstructure and mechanical prop-erties of high Mn-N TWIP stainless steels with 1.5％Si addition were studied by SEM and TEM.The results showed that the annealing twin thickness of the tested steel increased with the increase in solu-tion temperature.At high solution temperatures,Si was added to improve the strain hardening rate of the alloy.A large number of slender deformation twins were generated during tensile deformation,which can effectively prevent dislocation slip and improve materials strength and plasticity.The effect of aging treatment on the materials tensile properties was relatively small.During the aging process at 700～800 ℃,a large amount of grain boundary cellular precipitates were generated,which were mainly com-posed of short rod-shaped Cr2N particles.Under impacting loads,intergranular brittle fracture occurred,and the impact absorption energy decreased rapidly.
NETL
NSTL
万方数据
