High-toughness die forged steel base material, sandwich layer forging die and preparation method of sandwich layer forging die

Abstract

The invention discloses a high-toughness die forged steel base body material, a sandwich layer forging die and a preparation method of the sandwich layer forging die. The high-toughness die forged steel base body material comprises the following components in percentage by mass: 0.32%-0.38% of C, 0.3%-0.5% of Si, 0.6%-1.0% of Mn, 1.4%-1.7% of Cr, 1.4%-1.7% of Ni, 0.15%-0.35% of Mo and the balance of iron. The total amount of impurities is less than 0.12 wt%. According to the method, the technical problems that an existing die base body is poor in plasticity / toughness, prone to cracking and the like under the conditions that the temperature is 350 DEG C or above and the local instantaneous stress is 650 MPa or above are solved, the bonding strength between a die forged steel base body material and a multi-gradient functional layer manufactured through additive manufacturing is further improved, the one-time service life of the large hot forging die is effectively prolonged, and the number of repairable remanufacturing times is increased. The prepared large hot forging die can be used for producing four batches of titanium alloy forgings on a 80,000-ton press, and a die forged steel base body is free of deformation and cracking, so that the one-time service life of the large hot forging die is prolonged by more than five times.

Description

technical field [0001] The invention belongs to the technical field of die forging steel manufacturing, and in particular relates to a forging steel base material, a die forging steel base, a sandwich layer forging die and a preparation method for preparing large-scale high-toughness hot forging dies under high temperature and heavy load conditions. Background technique [0002] With the development of the country's heavy equipment manufacturing industry, equipment manufacturing industries such as aircraft and shipbuilding need to rapidly upgrade their capabilities. The world's largest large-scale die forging hydraulic press (80,000 tons press) came into being, and the large hot forging dies (single set weight has reached 60-100 tons) have 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 frames, landing gear, engine turbine discs, 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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