Method for preparing oxide dispersion strengthened alloy by rapid forming

A technology of dispersion strengthening and oxide, which is applied in the direction of additive manufacturing, improvement of process efficiency, improvement of energy efficiency, etc., to achieve the effects of fine particle size, high density and excellent comprehensive mechanical properties

Inactive Publication Date: 2013-04-03
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing ODS alloys by laser rapid prototyping, which aims to solve the problem of forming OD

Method used

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  • Method for preparing oxide dispersion strengthened alloy by rapid forming

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: rapid prototyping 9Cr-ODS iron-based alloy

[0015] High-purity iron powder, chromium powder, tungsten powder, titanium powder, graphite powder and Y with particle size of 20-30nm 2 o 3 Powder is the raw material, and the ratio is as follows: 9%Cr, 2%W, 0.2%Ti, 0.13%C, 0.3%Y 2 o 3 and balance Fe. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3 The particles are uniformly dispersed in the Ni matrix, the ball / material ratio is 15 / 1, the ball mill speed is 380 rpm, and the ball milling time is 40 hours, and the mechanically alloyed powder with an average particle size of 61 μm is obtained. Secondly, CAD software is used to design the three-dimensional solid model of the part, and then the three-dimensional model is layered and sliced ​​to discretize it into a series of two-dimensional layers, and the layer information is transmitted to the control system of the SLM forming machine. At the...

Embodiment 2

[0016] Embodiment 2: rapid forming 12Cr-ODS iron-based alloy

[0017] High-purity iron powder, chromium powder, tungsten powder, titanium powder, graphite powder and Y with particle size of 20-30nm 2 o 3 Powder is used as the raw material, and the ratio is as follows: 12%Cr, 2%W, 0.3%Ti, 0.03%C, 0.4%Y 2 o 3 and balance Fe. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3 The particles are evenly dispersed in the Ni matrix, the ball / material ratio is 20 / 1, the ball mill speed is 400 rpm, and the ball milling time is 48 hours, and the mechanically alloyed powder with an average particle size of 52 μm is obtained. Secondly, CAD software is used to design the three-dimensional solid model of the part, and then the three-dimensional model is layered and sliced ​​to discretize it into a series of two-dimensional layers, and the layer information is transmitted to the control system of the SLM forming machine. At...

Embodiment 3

[0018] Embodiment 3: rapid prototyping nickel-based ODS alloy

[0019] High-purity nickel powder, cobalt powder, chromium powder, molybdenum powder, aluminum powder, titanium powder and Y powder with particle size of 20-30nm 2 o 3 Powder is the raw material, and the ratio is as follows: 13%Co, 19%Cr, 4%Mo, 1.4Al%, 3.0Ti%, 1%Y 2 o 3 and the balance Ni. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3The particles are uniformly dispersed in the Ni matrix, the ball / material ratio is 15 / 1, the ball mill speed is 480 rpm, and the ball milling time is 48 hours, and the mechanically alloyed powder with an average particle size of 45 μm is obtained. Secondly, CAD software is used to design the three-dimensional solid model of the part, and then the three-dimensional model is layered and sliced ​​to discretize it into a series of two-dimensional layers, and the layer information is transmitted to the control system ...

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Abstract

The invention belongs to the technical field of high-temperature alloy near net shape forming and discloses a method for preparing oxide dispersion strengthened alloy by rapid forming. The method includes: using the mechanical alloying process to obtain oxide dispersion strengthened alloy powder, using CAD (computer-aided design) software to design a three-dimensional solid model of an ODS (oxide dispersion strengthened) alloy part, subjecting the three-dimensional model to layering and slicing to disperse the three-dimensional model into a series of two-dimensional layers, smelting the ODS alloy powder layer by layer according to slicing information to obtain a laser rapidly formed blank in a needed shape, eliminating residue pores in the laser rapidly formed blank by means of hot isostatic pressing, and optimizing structure property by means of subsequent annealing or solid solution and aging heat treatment to obtain an ODS alloy part in a complex shape. Wrap packaging or fixture moulds are not needed, the complexity of shapes of parts is unlimited, and alloy components and structures are easy to control. The prepared ODS alloy is small in oxide dispersed phase, and products are high in compactness and excellent in comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the technical field of superalloy near-net forming, and in particular provides a method for preparing an oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS) alloy using a selective laser rapid forming technology using mechanical alloying powder as a raw material. Background technique [0002] Oxide dispersion strengthened alloys are an important class of high-temperature structural materials, which generally endow ODS alloys with excellent high-temperature mechanical properties through nano-oxide particles. Commonly used ODS alloys include iron-based ODS alloys, nickel-based ODS alloys, cobalt-based ODS alloys, etc. These alloys have important application potential in the energy field. For example, iron-based ODS alloys not only have good high-temperature mechanical properties, but also have excellent Radiation damage resistance, is a candidate material for the first wall, cladding and cladding tube in fusion r...

Claims

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Application Information

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IPC IPC(8): B22F3/105
CPCC22C32/0026B22F2998/10Y02P10/25B22F10/64B22F10/28B22F10/36C22C1/1084B22F3/15B22F2003/248
Inventor 章林曲选辉颉芳霞刘烨秦明礼何新波
Owner UNIV OF SCI & TECH BEIJING
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