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31. In this work, the effects of Si and Mn on the microstructure and mechanical properties of the bainite ductile iron by step austempering in the room-temperature machine oil have been studied.
32. Bainite has higher abrasive wear resistance than tempered martensite with equal or higher hardness in hard abrasion, but in reverse in soft abrasion.
33. When the isothermal time is long enough, the carbide precipitated between the rod-like upper bainite, so the upper bainite presented normal featherlike micromorphology.
34. A low alloy Bainite ductile cast iron had been obtained by using a new heat treatment technique of the step austempering in room temperature machine oil.
35. Segregation model of austenite boundary are established, mechanism of tempered—martensite embrittlement and bainite transformation are analysed thermodynamically.
36. The results show that: the transformation range of lower bainite is enlarged and the start temperature of bainite transformation is lowered by addition of boron.
37. It shows that even granular bainite structure can be obtained in the condition of air quenching. The temper resistance is better and comprehensive mechanical properties of the steel are higher.
38. Bainite ferrite and retained austenite are obtained through austempering immedidely after intercritical annealing in the plain carbon Si Mn steel.
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