利用原子力显微镜(AFM)对Fe--0.3C--3Mn--2Ni--2Si(质量分数, %)合金中315℃等温贝氏体相变的表面浮突效应及相应区域的微观组织进行了对比观察.结果表明, 伴随贝氏体相变的帐篷型表面浮突效应完全是新相长大过程中的形状应变所引起; 贝氏体铁素体最小结构单元的表面浮突为帐篷型, 不同于单倾型马氏体浮突, 不可能以切变方式形成, 它的两浮突角在8---100之间. 扩散台阶机制可以解释上述现象。
Surface relief effect and their corresponding microstructure accompanying bainitic transformation in the steel Fe--0.33C--3.0Mn--2.15Si--1.25Ni (mass fraction, %) were studied by atomic force microscope (AFM). The results show that surface relief of bainite is produced by bainitic ferrite solely without the involvement of austenite. Furthermore, surface relief of a single structural unit is tent--shaped rather than invariant--plane--strain--typed and the tilt angles of the two sides are 9--10 and 8--9, respectively close to the magnitude expected from the diffusional ledgewise growth mechanism.
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