低中碳合金钢的条状和片状贝氏体铁素体包含着集结成束的铁素体亚条,亚条由多个有规则形状的铁素体细块组成,它是贝氏体铁素体的均匀切变长大的相变基元,其中无碳化物析出。贝氏体θ-碳化物来源于α基元块的相界沉淀,或富化碳奥氏体的脱溶分解。 铁素体亚条束的基元群有单、双向两种排列方式。单面表面浮雕是单向排列基元群的基元块单向均匀切变应变的累积所构成的;帐篷式的双面表面浮雕是双向排列的二组基元群的基元块相向均匀切变应变的累积所引起的,当二组基元群的基元块向背均匀切变应变的累积便形成倒置帐篷式的双面表面浮雕。二组基元群的间界面显示为“中脊面”。
The lath-or plate shaped bainitic ferrite of low and medium carbonalloy steels consists of packets of ferrite sublaths which are composed of manyfiner and regular ferrite blocks. They are uniform shear growth units of bainiticferrite phase transformation. No carbide is precipitated from them. The bainitic θ-carbides are precipitated from γ-α interface or carbon-rich austenite. The mode ofarrangement of the units in ferrite sublath packet is in uni- or bi-direction. Singlesurface relief is produced by the accumulation of uniform shear strains of all theferrite units arranged unidirectionally in a sublath packet, while tent-shaped surfacerelief is formed by the integration of the uniform shear strains of two groups withferrite units piling up in two-directions growing face to face; whereas if they growback to back, the integration will be responsible for inverttent-shaped surfacerelief. The interface trace between two groups of ferrite units in a sublath packetis shown as "midrib".
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