Technical method for preparing cold work die steel in high alloy through jetting deposition

A technology of cold working die steel and spray deposition, which is applied in the direction of metal material coating process, molten spraying, coating, etc., can solve the problems of high cost, many processes, large investment, etc., and achieve simplified production process, low manufacturing cost and low cost. The effect of reduced energy consumption and fine microstructure

Active Publication Date: 2009-04-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that there are many processes, and the investment in hot isostatic pressing process equipment is quite large, and the cost is very high

Method used

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  • Technical method for preparing cold work die steel in high alloy through jetting deposition
  • Technical method for preparing cold work die steel in high alloy through jetting deposition
  • Technical method for preparing cold work die steel in high alloy through jetting deposition

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of high alloy cold work die steel master alloy: smelting high alloy cold work die steel master alloy with intermediate frequency vacuum induction furnace, its alloy composition (weight %) is: 1.52C, 8.2Cr, 4.0V, 1.48Mo, ​​1.1 Si, 0.37Mn, excess Fe, and cast into the porous mold made of refractory material through baking, obtain the master alloy bar stock for spray deposition;

[0032] (2) Preparation of spray-deposited high-alloy cold-work die steel: Put the high-alloy cold-work die steel intermediate alloy bar into the spray-deposit medium-frequency induction furnace for remelting. The superheat of the melt is 220°C. Deposition method to obtain high-alloy cold-working die steel blanks, spray deposition process parameters are selected as follows: atomization gas: nitrogen; static atomization pressure: 2.0Mpa; catheter diameter: 3mm; atomization gas flow rate: 0.16m 3 / min; metal flow rate of liquid cold working die steel: 6.5kg / min; spray distance: 360mm...

Embodiment 2

[0034] (1) Preparation of high alloy cold work die steel master alloy: smelting high alloy cold work die steel master alloy with intermediate frequency vacuum induction furnace, its alloy composition (weight %) is: 1.51C, 8.01Cr, 3.9V, 1.4Mo, 1.0 Si, 0.4Mn, excess Fe, and cast into the porous mold made of refractory material through baking, obtain the master alloy bar stock for spray deposition;

[0035] (2) Preparation of spray-deposited high-alloy cold-work die steel: Put the high-alloy cold-work die steel intermediate alloy bar into the spray-deposit medium-frequency induction furnace for remelting. The superheat of the melt is 210°C. Deposition method to obtain high-alloy cold-working die steel blanks, spray deposition process parameters are selected as follows: atomization gas: nitrogen; static atomization pressure: 2.2Mpa; catheter diameter: 3.2mm; atomization gas flow rate: 0.17m 3 / min; metal flow rate of liquid cold working die steel: 6.7kg / min; spray distance: 380mm;...

Embodiment 3

[0037](1) Preparation of high alloy cold work die steel master alloy: smelting high alloy cold work die steel master alloy with intermediate frequency vacuum induction furnace, its alloy composition (weight %) is: 1.48C, 7.9Cr, 4.03V, 1.52Mo, 1.06 Si, 0.44Mn, remaining Fe, and cast in the porous mold that is made of refractory material through baking, obtain the master alloy bar stock for spray deposition;

[0038] (2) Preparation of spray-deposited high-alloy cold-work die steel: Put the high-alloy cold-work die steel master alloy bar into the spray-deposit medium-frequency induction furnace for remelting. The superheat of the melt is 190°C. Deposition method to obtain high-alloy cold-working die steel blanks, spray deposition process parameters are selected as follows: atomization gas: nitrogen; static atomization pressure: 2.7Mpa; catheter diameter: 4.1mm; atomization gas flow rate: 0.21m 3 / min; metal flow rate of liquid cold working die steel: 8.2kg / min; spray distance: 4...

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Abstract

This invention discloses a method for preparing high-alloy cold-working die steel by injection deposition. The method comprises: (1) preparing molten high-alloy cold-working die steel; (2) preparing high-alloy cold-working die steel green body by atomization deposition in inert gas when the temperature reaches required overheating degree. The components of molten high-alloy cold-working die steel are: C 1.45-1.55 wt.%, Cr 7.8-8.2 wt.%, V 3.9-4.1 wt.%, Mo 1.4-1.6 wt.%, Si 0.9-1.1 wt.%, Mn 0.3-0.5 wt.%, and Fe. Since atomization deposition is utilized, the obtained green body has tiny and uniform microstructure without macroscopic precipitation. The grain sizes of the green body are 2-10 mums, and the green body can be directly hot-rolled without forging. The method can avoid the occurrence of eutectic ledeburite, and has such advantages as simple process, low cost and low energy consumption.

Description

technical field [0001] The invention relates to a process method for preparing high-alloy cold-working die steel by spray deposition. Background technique [0002] Spray deposition is a near-net shape, semi-solid metallurgical forming processing technology developed on the basis of powder metallurgy gas atomization powder production. It can not only overcome the defects of coarse grains, serious composition segregation, and coarse network carbides brought about by the traditional smelting and casting process, but also avoid multiple processes such as powder making, pressing, and sintering of powder metallurgy. Spray deposition technology has gradually become one of the hotspots in the research and industrialization development of materials science and engineering. [0003] The material prepared by the spray deposition technology has a series of characteristics of the rapid solidification material, that is, the microstructure is uniform and fine, no macro segregation, no coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/00C23C4/06C23C4/12C22C38/24
Inventor 樊俊飞史海生乐海荣周灿栋任三兵
Owner BAOSHAN IRON & STEEL CO LTD
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