Formation and growth model of
B-Al permeation layer of Steel 45
B-Al permeation layer of Steel 45
(1.School of Materials Science and Engineering,
Harbin University of Science and Technology,Harbin 150040,China；
2.School of Mechanical & Electrical Engineering,
Harbin Engineering University,Harbin 150001,China；
3.School of Application Science,
Harbin University of Science and Technology,Harbin 150080,China)
Harbin University of Science and Technology,Harbin 150040,China；
2.School of Mechanical & Electrical Engineering,
Harbin Engineering University,Harbin 150001,China；
3.School of Application Science,
Harbin University of Science and Technology,Harbin 150080,China)
Abstract: The B-Al permeation layers of Steel 45 were studied by means of SEM, TEM and XRD.The formation and growth model of permeation layer was proposed.The layer formation,growth and the migration behaviors of B were discussed.It is suggested that the diffusion of Al is deferred when the surface was covered by borides and aluminize compounds are surrounded by borides with the further growing of borides.
Key words: Steel 45;B-Al permeation;formation and growth model