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采用淬火+回火对不同镍含量的低铬铸铁进行处理,测定了其硬度和韧性,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对其组织和冲蚀形貌进行表征,分析了淬火温度及镍含量对其组织和性能的影响。结果表明,含镍低铬铸铁热处理后,铸态组织中网状共晶碳化物断网,呈半连续网状分布在珠光体基体上,二次碳化物溶解于基体中;Cr与Fe、C结合形成(Fe,Cr)3C型合金碳化物,起抗磨骨架作用;Ni固溶于铁素体中,提高基体耐蚀性,并降低碳原子扩散激活能,影响热处理后组织形态及性能;经960℃风淬+250℃回火处理,含Ni 0.9%的低铬铸铁的硬度和韧性达到峰值,抗冲蚀磨损性相对较好。
The low chromium cast iron with different nickel content was treated by quenching and tempering. The hardness and toughness of the low chromium cast iron with different nickel contents were determined. The erosion wear test of Ni - Cr cast iron was carried out by MCF - 30 erosion tester. The scanning electron microscopy (SEM) Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize the morphology and morphology of the microstructure. The effects of quenching temperature and nickel content on microstructure and properties were analyzed. The results show that the network of eutectic carbide in the as-cast microstructure is broken after heat treatment, and the semi-continuous network distributes on the pearlite matrix and the secondary carbide dissolves in the matrix. Cr and Fe, C Combined with the formation of (Fe, Cr) 3C alloy carbides, plays the role of anti-wear skeleton; Ni solid solution in the ferrite to improve the corrosion resistance of the matrix and reduce carbon atom diffusion activation energy, affect the morphology and properties after heat treatment; The hardness and toughness of the low chromium cast iron containing 0.9% Ni reached the peak after being tempered at 960 ℃ and tempered at 250 ℃, and the erosion and abrasion resistance was relatively good.