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铸造奥氏体不锈钢有强磁性,因此无法满足客户要求。采用OM、SEM和XRD对铸造奥氏体不锈钢的显微组织进行观测,研究了铸造奥氏体不锈钢有强磁性的原因,并依据凝固理论和Schaeffler模型分析,提出解决措施。结果表明:铸造奥氏体不锈钢由奥氏体、网状或小块状的δ铁素体和铬的碳化物组成,铁素体含量过高导致其具有强磁性。通过调整元素含量,降低Cr、Si、Mo、Nb等铁素体形成元素,增加Ni、C、N、Mn、Cu等奥氏体形成元素,可以减少铁素体含量。通过理论计算尽可能减少Ni含量,进而控制铸造成本。
Cast austenitic stainless steel has a strong magnetic, it can not meet customer requirements. The microstructure of cast austenitic stainless steel was observed by OM, SEM and XRD. The reason of the ferromagnetism of cast austenitic stainless steel was studied. According to the solidification theory and the Schaeffler model analysis, the solution was put forward. The results show that the cast austenitic stainless steel consists of austenite, reticulate or small pieces of δ-ferrite and chromium carbides. The ferrite content is too high to make it ferromagnetic. By adjusting the element content, reducing the formation of elements such as Cr, Si, Mo, Nb and other ferrite and increasing the formation of austenite such as Ni, C, N, Mn and Cu, the ferrite content can be reduced. Through the theoretical calculation to reduce Ni content as much as possible, and then control the casting cost.