Fe-C-Mo合金における未溶解炭化物の影響を補正したMoの焼入性倍数と焼入性の予測式
1992 年 78 巻 4 号 p. 616-623
詳細
1992 年 78 巻 4 号 p. 616-623
Hardenability of Fe-C-Mo alloys varies to a larger extent with carbon and molybdenum contents, and with quenching temperature, and this is attributed to the variation in effective molybdenum and carbon due to insoluble carbides. For this reason, it is important for molybdenum hardenability to be evaluated by net amount of effective molybdenum with a correction of insoluble carbide.
In this study, basing on the previously reported data, multiplying factor of molybdenum is derived as a function of effective molybdenum, [Mo]( % ), for Fe-C-Mo alloys containing molybdenum up to 2%:
fMo=-0.512×[Mo]2+2.86×[Mo]+1
Furthermore, prediction formulae calculating the amount of insoluble carbide remained on quenching as well as molybdenum and carbon fixed as carbide are proposed by a kinetic consideration of carbide dissolution at quenching temperature. Combining these formulae, hardenability of Fe-C-Mo alloys are calculated directly from chemical compositions and quenching conditions.
