Lower bainite alloy steel article and method of making same

Details Lower bainite alloy steel article and method of making same Lower bainite alloy steel article and method of making same

C - Chemistry, Metallurgy

22

C

75/141, 148/50.2

C22C 38/12 (2006.01) C21D 1/20 (2006.01) C21D 6/00 (2006.01)

Patent

CA 1133287

Abstract A lower bainite alloy steel article parti- cularly suitable for gears, bushings and the like includes carbon in the range of 0.60 to 0.80 wt.%, manganese in the range of 0.45 to 1.00 Wt.%, silicon in the range of 0.15 to 2.20 Wt.%, molybdenum in the range of 0.40 to 0.70 Wt.%, and the balance substantially iron. A process of heat treatment of the article includes the steps of quenching it from a first temperature at a preselected rate and of holding it at a second tempera- ture for less than about two hours to complete transformation of the alloy directly from an austenite morphology to a substantially complete low temperature bainite morphology.

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