Al拡散鋼の機械的諸性質

抄録

For the Al diffused steels, many applications are considered, so that their mechanical properties as metallic materials have become important. Author, at the present, investigated the tensile strength, yielding strength, elongation, hardness of diffused layers and resistance against for abrasion of these Al diffused steels. Because the specimen was small, C and N₂ greatly affected the strength and elongation. For example, the yielding point disappeared when the diffusion temperature was higher. This is caused by the fact that the N₂ dissolved in steel become fixed as nitride of Al. The hardness of diffused layers depended upon the conditions of diffusion and the hardness of surface of samples diffused in atmosphere reached about Vickers 250∼350, but, of samples diffused in vacuum it was very low (Vickers 50∼60). Also when the diffusing condition was such as illastrated in Fig. 7b, surface diffusion occured and its hardness curve was different from others. In the resistance against of abrasion, steels did not give good results, but improved results were obtained by gray cast iron.