Preparation method of high-strength iron-base alloy and high-strength iron-base alloy cutting pick

Abstract

The invention provides a preparation method of a high-strength iron-base alloy which is provided with a certain number of amorphous phases in internal structure and has certain plastic deformation capacity and high breaking strength. The preparation method comprises steps as follows: raw materials including 3.75%-3.76% by weight of Cr, 8.64%-8.67% by weight of Mo, 1.08%-1.09% by weight of C, 0%-3.7% by weight of V and the balance of Fe are mixed, are heated and molten in a crucible of an arc-melting furnace under the inertial gas shielding and then are continuously smelted for at least 5 min, the alloy is overturned and repeatedly smelted for 3-5 times after being cooled with the crucible until being solidified, and an alloy ingot with uniform components is obtained; the alloy ingot is taken out, an oxidation film on the surface is ground off, then the alloy ingot is placed in a crucible of an induction melting furnace for smelting, after the alloy is completely smelted, smelted alloy melt is poured in the mold for cooling, and the high-strength iron-base alloy is obtained. A mold for preparing a cutting pick is adopted to replace the mold in the preparation method of the high-strength iron-base alloy, and accordingly, the high-strength iron-base alloy cutting pick can be prepared.

Description

technical field [0001] The invention relates to a preparation method of a high-strength iron-based alloy, and also relates to a coal mining pick. Background technique [0002] With economic development and social progress, the country's demand for coal is increasing, and at the same time, it has also strengthened the protection of resources and the environment, which urgently needs to improve the efficiency of coal mining. The quality of picks in coal mining machinery directly affects the mining efficiency of coal resources and the production cost of enterprises. As the power of coal mining machinery continues to increase, the quality requirements for picks are also getting higher and higher. When the pick cuts coal and rock, it must bear huge compressive stress, shear stress and impact load, and will rub and collide with hard materials in the coal seam. As the cutting progresses, the surface temperature of the pick will also increase. Gradually rise. This requires the pi...

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Problems solved by technology

However, it is difficult to grasp the heat treatment process in actual production, and it is easy to cause low toughness of the core, poor surface processing quality, and cause the middle shank of the pick to break during use.

After quenching heat treatment, 35CrMnSi alloy material obtains the double direction structure of martensite, bainite and retained austenite, which has high strength (about 1600 MPa), hardness (about HRC42) and toughness (60J / cm 2 ), but the wear resistance and corrosion resistance are not ideal, and the service life of the pick is short

40CrNiMo alloy has high strength, toughness, good hardenability and stability against overheating, but it is highly sensitive to white spots and has temper brittleness

30SiMn2Mo alloy can obtain higher strength (about 1650 MPa), hardness (about HRC45) and toughness (about 62J / cm2) after heat treatment 2 ), has good toughness and wear resistance, but low impact toughness

The strength of 40Cr2SiMnMoCuBTiRe alloy after heat treatment is above 1560 MPa, and the hardness is HRC53~55, but its toughness is poor, and defects are prone to occur in the preparation process, which greatly limits the application of high-power coal mining machinery picks

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