A Study of Surface Hardening on Local Bolts (C= 0.01 ) at a Temperature of 400°C for 5 and 6 Hours With Nitrocarburizing Using RF- Plasma Apparatus

摘要

A study of surface hardening on local bolts (C=0.01%) at a temperature of 400°C for 5 and 6 hours with nitrocarburizing using RF-plasma apparatus. The objective of this experiment was to seek a surface material of local bolts that is more resistant to friction and having better surface uniformity, higher hardness and higher corrosion resistance. The experiment was conducted on the local bolts (C = 0.01%) with a radio-frequency (RF) plasma nitrocarburizing equipment. The nitrocarburization was done on the local bolts at a temperature of 400°C, with a variation of nitrocarburizing times of 5 and 6 hours. The results showed that the average hardness of local bolt samples before nitrocarburization was 136.08 kgf/mm~2. After nitrocarburization at a temperature of 400°C for 5 hours, the average hardness of local bolt samples was 199.1 kgf/mm~2. After nitrocarburization at a temperature of 400°C for 6 hours, the average hardness of local bolt samples was 201.12 kgf/mm~2. The matrixes on the base material were ferrite, austenite, and pearlite.