贝氏体分上贝氏体和下贝氏体.粒状贝氏体和准贝氏体为贝氏体转变的初级阶段;粒状组织不属于贝氏体.各类组织均有自己的C曲线.由C曲线组成中温TTT图,能形成几个海湾.贝氏体预相变期发生溶质原子偏聚,贫溶质区即形核位置.贝氏体在溶质原子扩散影响下相变基元沿缺陷面方向切变而增宽(厚),板条端部区相变基元平行叠加而伸长.贝氏体在晶体学上有切变性质,在热力学上有切变可能.
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