A kind of high toughness die forging steel base material, sandwich layer forging die and preparation method thereof

Abstract

The invention discloses a high toughness die forging steel base material, a sandwich layer forging die and a preparation method thereof. The mass percentage of the high toughness die forging steel base material components: C is 0.32-0.38%, Si is 0.3-0.5%, Mn is 0.6-1.0%, Cr is 1.4-1.7%, Ni is 1.4-1.7%, Mo It is 0.15-0.35%, and the balance is iron; the total amount of impurities is less than 0.12wt.%. The present invention solves the technical problems such as poor plasticity / toughness and easy cracking of the existing mold base under the condition that the temperature is above 350°C and the local instantaneous stress is above 650MPa, and further improves the multiplicity of mold forging steel base material and additive manufacturing. The bonding strength between the gradient functional layers can effectively improve the primary service life of large hot forging dies and increase the number of repairable remanufactures. The large-scale hot forging die prepared by it produced 4 batches of titanium alloy forgings on an 80,000-ton press, and the die forging steel matrix did not deform and crack, which increased the primary service life of the large hot forging die by more than 5 times.

Description

technical field [0001] The invention belongs to the technical field of die forging steel manufacturing, and in particular relates to a forged steel base material, a die forged steel base, a sandwich-layer forging die and a preparation method for preparing a large-scale high-toughness hot forging die under high temperature and heavy load conditions. Background technique [0002] With the development of the national heavy equipment manufacturing industry, equipment manufacturing industries such as aircraft and shipbuilding need to rapidly improve their capabilities. The world's largest large-scale forging hydraulic press (80,000-ton press) came into being, and the large-scale hot-forging die (a single set of weight has reached 60-100 tons) has been widely used in aviation, aerospace, nuclear power, petrochemical and other fields In the production and manufacture of large-scale die forgings, such as large aircraft fuselage frame, landing gear, engine turbine disk, large cylinde...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the problem to be solved by the present invention is: how to provide a high-toughness die forging steel base material for hot forging dies, which can be used to prepare high-toughness die forging steel bases, and solve the problem of existing die forging steel base materials. The matrix is ​​above 350°C, and the local instantaneous stress is under the high temperature and heavy load conditions of 650MPa. The plastic toughness is poor, it is easy to crack, and the performance cannot meet the requirements and other technical problems; at the same time, further improve the relationship between the die forged steel matrix material and the multi-gradient functional layer of additive manufacturing. The bonding strength between them can effectively improve the primary service life of large hot forging dies and increase the number of repairable and remanufacturing times

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