A kind of nickel-carbon-iron-based powder metallurgy alloy and preparation method thereof

Abstract

The invention discloses a nickel-carbon-iron-based powder metallurgy alloy and a preparation method thereof. The alloy includes raw materials in the following weight percentages: Ni-(1-7)wt%, C-(0.4-1)wt%, Fe-(92-94.6)wt%. The production process includes the following steps: (1) Ball milling and mixing: the nickel, the carbon and the iron materials are mixed by ball milling, the ball-to-material ratio is (1-3):1, and the rotating speed of the spherical tank is set to 200-400r / min. The ball milling time is 6-8 hours; (2) the material mixed by ball milling in step (1) is loaded into a mold, and pressed into a mold; (3) the material pressed and formed in step (2) is buried in refractory sand and heated at 1100 ° C After sintering at ‑1200°C for 1‑2h, the nickel-carbon-iron-based powder metallurgy alloy is obtained by cooling in the furnace. The protective atmosphere during the sintering process is (90‑100)%N2+(0‑10)%H2. In the present invention, nickel and carbon elements are added in iron-based powder metallurgy, and a suitable ball milling process is selected, so that the manufactured alloy has a better microstructure, smaller porosity, spheroidized pores, and smaller grain size, thereby obtaining a hardness Iron-based powder metallurgy material with high tensile strength and good plasticity.

Description

technical field [0001] The invention relates to the field of iron-based powder metallurgy, in particular to a powder metallurgy low-alloy steel with nickel and carbon added and a preparation method thereof. Background technique [0002] Powder metallurgy technology has many unique advantages in material research and development and material processing, the most important of which are as follows: [0003] (1) Alloy materials prepared by powder metallurgy technology have very unique chemical and physical properties compared with materials prepared by traditional processes. Materials that cannot be prepared by traditional casting methods and mechanical methods, as well as many processed parts of refractory metals (such as hard alloys, functional ceramics, etc.) can be realized by powder metallurgy technology. [0004] (2) In the process of powder metallurgy material preparation, the composition and the addition amount of elements in the alloy can be easily changed. The element...

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Problems solved by technology

[0007] Subsequently, the alloy prepared by adding C element in Fe-Ni not only reduces the cost of powder metallurgy products, but also obtains better performance. After quenching, its tensile performance can exceed 800MPa, but the alloy after quenching Plasticity has not been significantly improved

[0008] Fe-Ni-C powder metallurgy has been widely used because of its good mechanical properties, but the influence of Ni and C in Fe-Ni-C powder metallurgy materials on the properties of iron-based powder metallurgy products and the microstructure There are few studies on the changes of iron-based powder metallurgy materials. A lot of research has been done on the mechanical properties of iron-based powder metallurgy at home and abroad, and the strength and hardness of the alloy have been greatly improved, but the plasticity of iron-based powder metallurgy materials has not been obtained. It is obviously improved, and at the same time, the factors affecting the plasticity of iron-based powder metallurgy materials by adding elements have not been fully explained and studied, and its application range is still limited so far.

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