Fe-0.3C-3Mn-2Ni-2Si中贝氏体表面浮突效应的原子力显微镜研究  

ATOMIC FORCE MICROSCOPE INVESTIGATION OF THE SURFACE RELIEF EFFECT OF BAINITE IN AN Fe-C-Mn-Ni-Si ALLOY

作　　者：杨金波[1] 杨志刚[1] 白秉哲[1] 方鸿生[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《金属学报》2004年第6期574-578,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金50201007;高等学校博士学科点专项科研基金20020003084

摘　　要：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8-10°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 9-10degrees and 8-9degrees, respectively close to the magnitude expected from the diffusional ledgewise growth mechanism.

关 键 词：贝氏体 表面浮突 铁素体 结构单元 

分 类 号：TG115.22[金属学及工艺—物理冶金]