410不銹鋼表面滲碳硬化與鈍化
Date Issued
2001
Date
2001
Author(s)
顧鈞豪
DOI
892216E002051
Abstract
As a molding and cutting material for plastic forming industry, tool steel is always used for its excellent wear resistance. But its poor corrosion resistance limits the productuvity of plastics. On the contrary, stainless steel owns excellent corrosion resistance but poor wear resistance. To improve the surface hardness of 410 martenstic stainless steel, a heat treatnent of vacum carburization process was carried out, and then was followed by electrolish, chemical polish, mechanical polish, and chemical passivation processes to recuperate the corrosion resistance of the steel.
In this experiment, the process parameters, such as gas composition, gas flow rate, diffusion time etc., all had been optimized. The surface condition and cerbon and chromium distribution in the surface layer were examined and analyzed by EPMA, XRD, SEM-EDX and GDS. It was expected to develop a surface modified 410 stainless steel with better wear and corrosion resistance.
Experiment results show that after the optimized vacuum carburizing process, SUS 410 stainless steel may reach a hardness of HV650 in surface layer and HV460 inside the matrix with fully martensite structure. After some surface treatment, such as electropolishing, chemical polishing, and mecharical polishing, the corrosion resistance of the alloy surface can not be improve significantly, but can be improve by the final chemical passivation process. Only the alloy sample treated by the vacuum carburization followed by chemical polishing and chemicalpassuvation shows a worse corrosion resistance, because of its porous surface structure which can not form a continuous chromium oxide layer.
Subjects
410 Stainless Steel
Passivation
Vacuum Carburization
Matensitic stainless steel
Electropolishing
Chemical polishing
Polarization curve
Corrosion resistance
Publisher
臺北市：國立臺灣大學材料科學與工程學研究所
Type
report
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