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利用MCF-30型冲蚀磨损试验机对镍铬铸铁进行冲蚀磨损试验,采用扫描电镜(SEM)、透射电镜(TEM)、XRD技术对其组织和冲蚀磨损后的形貌进行表征,分析了冲蚀角、冲蚀介质酸碱度对其冲蚀磨损性能的影响,总结了其冲蚀磨损规律。结果表明,镍铬铸铁在960℃风淬+250℃回火处理后,Cr与Fe、C形成(Fe,Cr)3C型合金碳化物,呈断续网状分布,起到了抗磨骨架的作用,Ni固溶于铁素体中强化基体;不同冲蚀角下,其冲蚀磨损曲线呈现“M”形,最大冲蚀率出现在60°冲蚀角;强酸对其冲蚀磨损影响较大,当pH≥3的时候,弱酸对其冲蚀磨损量几乎无影响。对其冲蚀磨损机理进行了分析。
The abrasion test of Ni-Cr cast iron was carried out by using MCF-30 erosion tester. The morphology of the Ni-Cr cast iron was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) The effects of erosion angle, erosion medium pH on erosion wear performance were summarized, and erosion and erosion rules were summarized. The results show that the Cr (Fe, Cr) 3C alloy is formed by intermittent reticular distribution of Cr and Fe, C after being quenched at 960 ℃ by air quenching + 250 ℃ and plays the role of anti-wear skeleton , Ni solid solution in the ferrite to strengthen the matrix; under different erosion angle, the erosion wear curve showing “M ” shape, the maximum erosion rate appears in the 60 erosion angle; the impact of strong acid erosion erosion Larger, when pH≥3, the weak acid has almost no effect on erosion wear. The erosion wear mechanism was analyzed.