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Double-scanning spray forming preparation method of high-carbon wear resisting tool and mold steel

A tool and die steel, spray forming technology, applied in the direction of metal processing equipment, etc., can solve the problems of uneven material structure, high content of inclusions, etc., and achieve the effect of uniform carbide distribution, high quality, and cost reduction

Inactive Publication Date: 2016-04-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

However, the high-vanadium and high-cobalt tool steel with expensive metals added by spray forming has a high content of inclusions, and the internal structure of the material is not very uniform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] The composition of the tool and die steel master alloy material used is (wt%): C2.4; V10.68; Cr5.36; Mo1.4; Si0.82; Mn0.2; The weight of the alloy rod is determined by the capacity of the crucible.

[0026] The main operation process of spray forming to prepare high carbon brittle tool and die steel is: before the tool and die steel master alloy in the vacuum induction melting furnace is melted, the melting chamber and the atomization chamber are vacuumed. Using high-purity nitrogen (N 2 >99.9%wt, O 2 -3 Pa, close the vacuum valves, fill the two chambers with high-purity nitrogen, when the pressure is close to 1atm, vacuumize, and the vacuum degree is lower than 10 -2 Pa, repeat the operation twice; power transmission induction heating, after the tool and die steel is melted, the temperature of the alloy melt is 150°C higher than the melting point of the alloy. The molten steel is vacuum refined and kept warm for 20 minutes to make the composition and temperature of ...

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Abstract

The invention belongs to the field of processing and manufacturing of advanced materials, and relates to a double-scanning spray forming preparation method of high-carbon wear resisting tool and mold steel. The method fully uses advantages of a double-scanning spray forming process, and proposes a double-scanning spray forming preparation process of high-carbon wear resisting tool and mold steel. Compared with a single-nozzle spray forming process, the double-scanning spray forming has the following advantages: (1) the material structure is more uniform; the performance is higher; and the mass and heat distribution of alloy atomization molten drips of double-nozzle spray is more uniform; (2) a deposition blank is more regular in shape; and in two scanning nozzles, one nozzle is used for forming a cylindrical blank, and the other nozzle is mainly used for filling and feeding the middle mass of the blank; and (3) the cost is lower; and as the material yield of double-scanning spray forming is higher, the double-scanning spray forming is lower in cost compared with single-nozzle spray forming.

Description

technical field [0001] The invention belongs to the field of advanced material processing and manufacturing, and relates to a double-scanning spray forming preparation method of high-carbon wear-resistant tool and die steel. Background technique [0002] Spray forming technology was proposed by A.R.E.Singer of Swansea University in the United Kingdom. Later, after in-depth research and development of its process and equipment by Osprey Metals Ltd. in the United Kingdom, it gradually developed into a new technology for metal material preparation. The alloy material prepared by spray forming has the microstructure characteristics of rapid solidification powder metallurgy materials such as fine grain, uniform structure, and ability to inhibit macro segregation. [0003] Since the 1980s, my country has started research work on spray forming technology. The basic principle of the spray forming process is: after the molten metal melt is atomized into fine droplets by inert gas, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115B22F3/24B21J5/00
CPCB22F3/115B21J5/002B22F3/24B22F2003/248
Inventor 张勇张国庆贾崇林王涛李周
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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