Formation of Fe-Al lntermetallic Compound Film on Hot Work Tool Steel by Shot Lining and Heat Treatment

Author:  Y. Harada, K. Takahashi and Y. Sakamoto
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.456-462)
Doc ID:  2014120
Year of Publication:  2014
Abstract:  
The formation of an Fe-Al intermetallic compound film on tool steel by shot lining and heat treatment was investigated. In the experiment, a centrifugal-type peening machine with an electrical heater was employed. The shot medium was high-carbon cast steel. The substrate was a commercial tool steel, and the sheet was commercially available pure aluminum. The shot lining process of tool steel with an aluminum sheet was carried out at 573 K in air using a peening machine. Heat treatment was performed at diffusion temperatures from 873 to 1373 K in vacuum. The lined substrates exhibited a harder layer of aluminum-rich intermetallics in the diffusion temperature range of 973 to 1123 K. When the temperature of the lined substrates was more than 1173 K, the surface was covered with thicker and highly anticorrosive layers of iron-rich intermetallics. It was confirmed that the present method could be used for the formation of functional films on tool steel.