Powder metallurgy spring steel composite material and preparation method thereof

A powder metallurgy and composite material technology, applied in the field of powder metallurgy, to achieve the effects of improved wear resistance, good formability, and reduced subsequent processing

Inactive Publication Date: 2010-10-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on particle reinforced steel matrix composites using 45CrMoV spring steel as the matrix

Method used

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  • Powder metallurgy spring steel composite material and preparation method thereof
  • Powder metallurgy spring steel composite material and preparation method thereof
  • Powder metallurgy spring steel composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Prepare materials

[0024] Prepare powder material according to the following ratio:

[0025]

[0026] Step 2: Mixing and ball milling

[0027] After at least 2 hours of dry mixing on the V-type mixer, high-energy ball milling for 15 hours, the ball milling medium is stainless steel balls with a diameter of 8 mm, the ball-to-material ratio is 10:1, the ball mill speed is 226 rpm, and argon is used as the protective gas. The particle size of NbC particles is 200nm-400nm, and the NbC particles are uniformly dispersed in the 45CrMoV spring steel matrix;

[0028] Step 3: Hot isostatic pressing sintering

[0029] Put the above powder in a stainless steel sheath, and evacuate until the vacuum degree is at least lower than 10 -1 After Pa, it is welded and sealed. After inspection and confirmation that the sheath is completely airtight, it is put into a hot isostatic pressing furnace for sintering. The sintering parameters are: temperature 1180°C, pressure 70MPa, ...

Embodiment 2

[0032] Step 1: Prepare materials

[0033] Prepare powder material according to the following ratio:

[0034]

[0035] Step 2: Mixing and ball milling

[0036] After at least 2 hours of dry mixing on the V-type mixer, high-energy ball milling was carried out for 20 hours. The ball milling medium was stainless steel balls with a diameter of 16 mm. The ball-to-material ratio was 15:1. The particle size of NbC particles is 200nm-400nm, and the NbC particles are uniformly dispersed in the 45CrMoV spring steel matrix;

[0037] Step 3: Hot isostatic pressing sintering

[0038] Put the above powder in a stainless steel sheath, and evacuate until the vacuum degree is at least lower than 10 -1 After Pa, it is welded and sealed. After inspection and confirmation that the sheath is completely airtight, it is put into a hot isostatic pressing furnace for sintering. The sintering parameters are: temperature 1120°C, pressure 100MPa, holding time 2h.

[0039] That is to say, the elasti...

Embodiment 3

[0041] Step 1: Prepare materials

[0042] Prepare powder material according to the following ratio:

[0043]

[0044]

[0045] Step 2: Mixing and ball milling

[0046] After at least 2 hours of dry mixing on the V-type mixer, high-energy ball milling was performed for 10 hours. The ball milling medium was stainless steel balls with a diameter of 12 mm. The particle size of NbC particles is 200nm-400nm, and the NbC particles are uniformly dispersed in the 45CrMoV spring steel matrix;

[0047] Step 3: Hot isostatic pressing sintering

[0048] Put the above powder in a stainless steel sheath, and evacuate until the vacuum degree is at least lower than 10 -1 After Pa, it is welded and sealed. After inspection and confirmation that the sheath is completely airtight, it is put into a hot isostatic pressing furnace for sintering. The sintering parameters are: temperature 1150°C, pressure 80MPa, holding time 2.5h.

[0049] That is to say, the elastic tapered sleeve powder me...

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Abstract

The invention discloses a powder metallurgy spring steel composite material and a preparation method thereof. The composite material comprises the components with the content by mass percent: 85-95% of 45CrMoV and 5-15% of carbonized niobium powder; and the powder metallurgy spring steel composite material is prepared by the method combining high-energy ball-milling and thermal isostatic pressing sintering. The invention adopts the high-energy ball-milling to lead NbC to be evenly dispersed on a 45CrMoV spring steel base body, and greatly improves the wear resistance of the material under the condition of ensuring the mechanical property of the material; and furthermore, by adopting the method combining the high-energy ball-milling and the thermal isostatic pressing sintering, the invention effectively solves the problem of enhancing the fusion and interface of particles and the base body, thus leading the enhanced particles and base body to be more closely combined with each other. The spring steel composite material is especially applicable for manufacturing an elastic element.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a powder metallurgy spring steel composite material and a preparation method thereof. The spring steel composite material is especially suitable for manufacturing elastic elements. Background technique [0002] Spring steel is a steel grade specially used to manufacture various elastic components. Existing spring steel materials mainly include carbon spring steel, low alloy spring steel and high alloy spring steel. 45CrMoV is a kind of low-alloy spring steel. It belongs to heat-resistant spring steel. It has good mechanical properties at room temperature and high temperature, especially high temperature anti-relaxation performance. However, its wear resistance is slightly poor, so that the wear of the elastic element is serious under certain working conditions, which affects the precision and service life of the elastic element. [0003] Particle-reinforced steel-based composite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24B22F3/14
Inventor 肖志瑜秦志刚林小为张文李元元
Owner SOUTH CHINA UNIV OF TECH
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