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Nano metamorphism wear-proof nodular cast iron and preparation method thereof
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A nano-modified and wear-resistant ball technology, applied in the field of casting processing, can solve the problems of low molding efficiency, low hardness, poor wear resistance, etc., achieve good fatigue resistance and wear resistance, reduce internal stress concentration, and improve structure The effect of intensity
Inactive Publication Date: 2018-07-03
WUHU JINMAO FLUID TECH CO LTD
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The mechanical properties of ferritic nodular cast iron are: the tensile strength is greater than 400Mpa, the elongation is greater than 10%, but the hardness is low. Generally, the cast Brinell hardness is 160-210 degrees, and the wear resistance is poor. The wear-resistant nodular cast iron castings produced by the current technology have poor casting precision and low molding efficiency, and defects such as pores and cracks are easy to remain inside the casting after molding. Therefore, it is urgent to develop a new one for this problem. Wear-resistant nodular cast iron and its matching casting process to meet the needs of actual production and use
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Embodiment 1
[0020] like figure 1 As shown, a nano-modified wear-resistant ductile iron is composed of the following parts by mass: C: 3.5%, Si: 3.3%, Cu: 1%, Ni: 0.25%, W: 0.7%, Mn: 0.4%, Cr: 0.2%, Zr: 0.15%, Ce: 0.05%, Hf: 0.1%, Dy: 0.07%, Sm: 0.01%, Gd: 0.01%, Lu: 0.03%, S: 0.01%; P: 0.15%; The balance is Fe.
[0021] In this embodiment, among the C and Si, a part is C and Si elemental micropowder particles, and the other part is SiC elemental micropowder particles, wherein the total amount of SiC elemental micropowder particles is the total amount of C and Si elemental micropowder particles. 35%, the particle diameters of the C and Si elemental micropowder particles and the SiC elemental micropowder particles are both 200 nm.
[0022] In this embodiment, the Cu, Ni, W, Mn, C, Zr, S, P and Fe and part of C and S are all contained in iron alloys such as pig iron and scrap steel.
[0023] Further, the Ce, H, Dy, Sm, Gd and Lu are all contained in the rare earth additive.
[0024] A pr...
Embodiment 2
[0033] like figure 1 Shown is a nano-modified wear-resistant ductile iron, which is composed of the following parts by mass: C: 3.5%, Si: 2.8%, Cu: 1%, Ni: 0.2%, W: 0.8%, Mn: 0.5%, Cr : 0.3%, Zr: 0.2%, Ce: 0.1%, Hf: 0.25%, Dy: 0.08%, Sm: 0.05%, Gd: 0.05%, Lu: 0.06%, S: 0.01%; P: 0.2%; The amount is Fe.
[0034] In this embodiment, among the C and Si, a part is C and Si elemental micropowder particles, and the other part is SiC elemental micropowder particles, wherein the total amount of SiC elemental micropowder particles is the total amount of C and Si elemental micropowder particles. 20%, the particle diameters of the C and Si elemental micropowder particles and the SiC elemental micropowder particles are both 400 nm.
[0035] In this embodiment, the Cu, Ni, W, Mn, C, Zr, S, P and Fe and part of C and S are all included in iron alloys such as pig iron and scrap steel.
[0036] In this embodiment, the Ce, H, Dy, Sm, Gd and Lu are all included in the rare earth additive.
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Abstract
The invention relates to nano metamorphism wear-proof nodular cast iron which consists of the following materials of, by mass, 3.5-3.7% of C, 2.8-3.3% of Si, 0.5-1.3% of Cu, 0.2-0.3% of Ni, 0.1-0.8% of W, 0.1-0.5% of Mn, 0.2-0.3% of Cr, 0.11-0.2% of Zr, 0.05-0.1% of Ce, 0.1-0.25% of Hf, 0.03-0.08% of Dy, 0.01-0.05% of Sm, 0.01-0.05% of Gd, 0.03-0.06% of Lu, less than 0.02% of S, 0.15-0.4% of P, and the balance Fe. A preparation method of the nano metamorphism wear-proof nodular cast iron comprises the steps of raw materialsmelting, metamorphism modulation, temperingcasting and modification heat treatment. The nodular cast iron of a binary iron phosphide eutectic structure, which is uniform, is continuously distributed and is high in rigidity and ensures the elongation percentage is obtained by employing rare earth elements, and through nano modification, the nodular cast iron has good fatigue resistance and abrasion resistance.
Description
technical field [0001] The invention relates to a nano-modified wear-resistant ductile iron and a preparation method, and belongs to the technical field of castingprocessing. Background technique [0002] At present, cast iron pipe fittings are mostly produced with ferritic ductile iron, which is produced with ductile ironpig iron or low sulfur, phosphorus content and pig iron with a small amount of scrap steel as raw materials. The mechanical properties of ferritic ductile iron are: the tensile strength is greater than 400Mpa, the elongation is greater than 10%, but the hardness is low. In general, the as-cast Brinell hardness is 160-210 degrees, the wear resistance is poor, and The wear-resistant ductile iron castings produced by the current process have poor casting accuracy and low forming efficiency during casting operations, and defects such as pores and cracks are likely to remain in the castings after forming. Therefore, in response to this problem, it is urgent to...
Claims
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