The electrolytic plasma surface treatment technology was used to treat 3Cr13 stainless steel
and the microstructural changes and hardness distribution of the samples under different treatment times were investigated using metallographic structure observation and microhardness testing. The research results show that this technology can complete the hardening treatment of the specified area in a short time. After electrolytic plasma surface treatment
a spherical crown-shaped hardened area is formed
with the fully hardened area consisting of martensite structure and residual austenite
and the grain size is about 2-3 times that of the base material
transitioning smoothly towards the depth. The incompletely hardened area has a granular structure
while the grain refinement area has a granular pearlite structure. The highest microhardness value of the hardened layer can reach 717.9 HV0.1
and the depth of the hardened layer can exceed 7.5 mm
with the depth of the hardened layer above 500 HV0.1 being greater than 3 mm. Increasing the treatment time can increase the maximum hardness value and the depth of the hardened layer
with the depth of the hardened layer being more significantly affected by time factors
and the depth of the hardened layer above 500 HV0.1 can be increased from 0.4 mm to 3.5 mm.
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