CuS在针状铁素体形核过程中的作用

设计出了研究夹杂物在针状铁素体形核过程中的作用的物理模拟试验方法。研究了CuS、Al2 O3 和Al2 O3 ·CuS在针状铁素体形核过程中的作用 ,用数字式金相显微镜观察了夹杂物界面附近区域的金相显微组织变化 ,用电子探针分析仪对夹杂物界面附近微区的化学成分进行了分析。研究结果表明 ,在热循环作用下 ,CuS和Al2 O3 ·CuS能使夹杂物与金属交界面附近出现贫Mn区 ,CuS与Al2 O3 ·CuS具有诱导针状铁素体形核的能力 ;而Al2 O3 不能使夹杂物与金属交界面附近区域的化学成分发生变化 ,Al2 O3不具有诱导针状铁素体形核的能力。夹杂物表面的CuS在针状铁素体形核过程中起着重要作用

Role of CuS in Formation Nucleation of Acicular Ferrite

The physical simulation test method for researching on the role of inclusions in formation nucleation of acicular ferrite was designed and the roles of CuS,Al₂O₃ and Al₂O₃·CuS in nucleation of acicular ferrite were studied.The metallurgical microstructures of the micro zone adjacent to the inclusions were observed with digital metallurgical microscope and the chemical compositions of the micro zone adjacent to the inclusions were analysed with electron probe mircoanalyzer.The results show that CuS and Al₂O₃·CuS can make depleted Mn zones be formed in the metal micro zone adjacent to the inclusions formed,CuS and Al₂O₃·CuS have an ability to induce the nucleation of acicular ferrite;Al₂O₃ can not make the chemical composition of the metal micro zone adjacent to the inclusions change and depleted Mn zones can not be formed,and Al₂O₃ is not potent in nucleating acicular ferrite during thermal cycle.The CuS on inclusion surface plays an important role on the nucleation and growth of acicular ferrite.