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

Abstract

The invention discloses a high-strength die forging steel base material, a sandwich layer forging die and a preparation method of the sandwich layer forging die. The high-strength die forging steel base body comprises, by mass, 0.5-0.7% of C, 0.3-0.4% of Si, 0.7-0.9% of Mn, 0.8-1.0% of Cr, 1.5-1.8% of Ni, 0.1-0.3% of Mo, 0.1-0.2% of Cu and the balance iron, wherein the total amount of impurities is less than 0.12%, P is less than or equal to 0.01%, and S is less than or equal to 0.01%. According to the high-strength die forging steel base material, the sandwich layer forging die and the preparation method of the sandwich layer forging die, the technical problems that the hardness and the strength are rapidly reduced, and deformation and cracking occur easily under the conditions that the temperature is more than 350 DEG C and the local instantaneous stress is more than 650 MPa in the use working condition of an existing die base body are solved; the bonding strength between the die forging steel base material and a multi-gradient functional layer manufactured through additive manufacturing is improved, the one-time service life of a large hot forging die is effectively prolonged, the number of times of repairable remanufacturing is increased, seven batches of high-strength steel forgings are produced on a 80,000-ton press, a die base body is free of deformation and cracking, and the one-time service life of the large hot forging die is prolonged by more than 10 times.

Description

technical field [0001] The invention belongs to the technical field of die forging steel manufacturing, and specifically relates to a die forging steel matrix material, a die forging steel matrix, a sandwich layer forging die and a preparation method thereof for preparing high-strength dies of large 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 disc...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the problem to be solved by the present invention is: how to provide a high-strength die forging steel matrix material for hot forging dies, so as to be used to prepare high-strength die forging steel matrix, and solve the existing When the temperature of the mold base is above 350°C and the local instantaneous stress is above 650MPa, the hardness and strength decrease rapidly, and the performance cannot meet the requirements and other technical problems

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