THE PRECIPITATION OF BN IN ISOTHERMAL TREATMENT PROCESS
Yin Shike (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Belling); Hajime Komatsu; Mitsuru Tanino (Fundamental Research Laboratories; Nippon Steel Corporation; Japan)
Cite this article:
Yin Shike (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Belling); Hajime Komatsu; Mitsuru Tanino (Fundamental Research Laboratories; Nippon Steel Corporation; Japan). THE PRECIPITATION OF BN IN ISOTHERMAL TREATMENT PROCESS. Acta Metall Sin, 1982, 18(5): 565-646.
Abstract In the steel 40BP, during isothermal treatment after austenizing, the BN precipitates out usually around the spherical MnS grain as nucleus of crystallization to form a compound of MnS+BN. When the heating temperature elevated over 1150℃, the MnS becomes polyhedral, but does not be the nucleus of BN crystallization no more. The BN first precipitates as fine spherical crystallite and then as a plate-like single crystal if it grows up to 0.6μm in size.
