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研究了固溶处理对00Cr22Ni5Mo3N双相不锈钢铸坯显微组织、铁素体含量转变及相成分的变化规律的影响。研究表明:800~950℃保温时,组织主要以σ相和奥氏体相(γ2)转变为主;950~1300℃保温时,主要以铁素体组织转变为主,铁素体含量随着温度的升高而增加;不同的保温段,铁素体转变也不尽相同,其中950~1150℃保温时,铁素体转变量较少,而在1150~1300℃保温时,铁素体转变较为迅速;通过化学试剂腐蚀1150~1300℃保温试样,铁素体组织内发现大量的微裂纹,主要是由于试样的残余热应力造成的;通过电子探针(EMA)对σ相检测表明,σ相主要富集Mo、Cr元素;扫描电镜(SEM)对试样检测表明,铁素体和奥氏体相成分有所不同,铁素体主要富集Cr、Mo等元素,而奥氏体主要富集Ni、Mn等元素,随着温度的升高,化学成分也有变化。
The effect of solution treatment on microstructure, ferrite content and phase composition of 00Cr22Ni5Mo3N duplex stainless steel slab was studied. The results show that the microstructure mainly changes from σ phase to austenite phase (γ2) at 800-950 ℃. The ferrite transformation takes place mainly at 950-1300 ℃, The temperature increases and increases; different insulation section, ferrite changes are not the same, of which 950 ~ 1150 ℃ insulation, ferrite transformation less, and in the 1150 ~ 1300 ℃ insulation, ferrite transformation Which is more rapid. The corrosion of 1150 ~ 1300 ℃ samples by chemical reagents shows that a large number of micro-cracks are found in the ferrite microstructure, which is mainly caused by the residual thermal stress of the samples. The detection of σ phase by EMA , and the σ phase is mainly enriched in Mo and Cr elements. The examination of the sample by scanning electron microscopy (SEM) shows that the compositions of ferrite and austenite are different. The ferrite mainly contains elements such as Cr and Mo, while the austenite The main enrichment of Ni, Mn and other elements, with the temperature increases, the chemical composition also changes.