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中碳结构钢马氏体中存在少量(8～10%)铁素体时,铁素体形态对铜的机械性能有着重要影响。研究表明,在低、中温回火状态下,细粒状铁素体的复相组织的强度和塑性与全马氏体相当,但韧性和疲劳性能优于后者;而半网状铁素体的复相组织的强度、塑性和韧性均属最低。随回火温度升高,铁素体形态对其组织的强度、塑性和韧性的影响逐渐减小;经高温回火后,具有不同形态铁素体的复相组织的强塑韧性基本相当。本文运用扫描电镜下形变断裂过程的动态观察、断口分析、断口与组织对应观察等分析手段,对其强塑韧性变化的微观机理作了较全面的探讨,提出了不同形态铁素体的形变断裂模型。
The ferrite morphology has an important effect on the mechanical properties of copper when a small amount (8-10%) of ferrite is present in martensite of medium carbon structural steel. The results show that the strength and ductility of the composite microstructure of fine granular ferrite is equivalent to that of the all-martensite, but the toughness and fatigue properties are better than that of the latter in the condition of low and medium temperature tempering. However, the semi-reticular ferrite Complex phase strength, ductility and toughness are the lowest. With the increase of tempering temperature, the effect of ferrite morphology on the strength, ductility and toughness of the microstructure decreases gradually. After the high temperature tempering, the ductility and ductility of the complex phase with different morphologies of ferrite are almost the same. In this paper, the microscopic mechanism of the change of ductile-plastic toughness is discussed comprehensively by means of dynamic observation, fracture analysis, corresponding observation of fracture and tissue under the scanning electron microscope. The deformation fracture of different forms of ferrite model.