13Cr-3.8Ni 鋳鋼における炭化物と靱性の関係

概要

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Relation between toughness degradation and carbide precipitation of 13Cr-3.8Ni cast steel has been studied experimentally and theoretically. The results are summarized as follows : (1) Chromium carbide (M_<23>C_6) precipitated at prior austenite grain boundary in austenite region deteriorates the toughness to give mosaic-like intergranular failure. (2) Notch toughness, FATT (℃), is a function of both carbon content, C (wt%), and cooling rate from 950℃, R (℃/h), and the following relation is obtained. FATT=3119・C-45 log R-13 (3) The rate-determining stage for the carbide precipitation is considered to be the formation of carbide. (4) Reducing silicon content and increasing molybdenum content improve toughness as the result of retarding M_<23>C_6 precipitation along grain boundaries.
社団法人日本鉄鋼協会の論文
1983-09-01