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A preparation method of fully dense nanocrystalline pure iron bulk material

A nanocrystalline and bulk material technology, applied in the field of nanocrystalline bulk material preparation, can solve the problems of low production efficiency, high requirements for preparation equipment, limited grain refinement ability, etc., and achieves simple process, simple equipment, and controllability. Good results

Active Publication Date: 2016-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultra-fine grain bulk material prepared by this method does not have problems such as microporosity and oxidation pollution, but the preparation equipment requires high requirements, the grain refinement ability is limited, and the production efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The invention discloses a method for preparing a fully dense nanocrystalline pure iron block material, the steps of which are as follows:

[0016] 1) Processing of pure iron billet and carbon steel cladding sleeve: process industrial pure iron into a cylindrical shape, process Q235A carbon steel into a hollow cylindrical cladding sleeve, the height of the cylindrical industrial pure iron is the same as that of the carbon steel cladding The height of the sleeve is consistent, the diameter of the inner hole of the carbon steel clad sleeve is 0.5mm larger than that of the cylindrical industrial pure iron, and the outer diameter is 6mm larger than the inner diameter;

[0017] 2) Cryogenic treatment of pure iron: completely immerse the processed cylindrical industrial pure iron in liquid nitrogen and keep it for 15-18 minutes;

[0018] 3) Heavy load impact treatment: first place the carbon steel sheath on the workbench, then quickly take out the industrial pure iron in liqui...

Embodiment 1

[0023] 1) Industrial pure iron (original grain size 35μm) is processed into a cylindrical sample with a diameter of 20mm and a height of 40mm, and Q235A carbon steel is processed into a cylindrical coating with an outer diameter of 26.5mm, an inner diameter of 20.5mm and a height of 40mm;

[0024] 2) Immerse the cylindrical industrial pure iron processed in the first step completely in liquid nitrogen and keep it for 15 minutes;

[0025] 3) First place the carbon steel cladding sleeve on the workbench, quickly take out the industrial pure iron in the liquid nitrogen and put it into the inner hole of the carbon steel cladding sleeve on the workbench, start the 2000kg air hammer to it at high speed Forging, the number of forging is 1 time, the striking speed is 3.48m / s, and the primary deformation of cylindrical carbon steel sheath and industrial pure iron is controlled to 85%;

[0026] 4) Remove the impact-treated sample from the workbench, put it into an ordinary heat treatmen...

Embodiment 2

[0029] 1) Industrial pure iron (primary grain size is 35μm) is processed into a cylindrical billet with a diameter of 30mm and a height of 40mm, and Q235A carbon steel is processed into a cylindrical covering sleeve with an outer diameter of 36.5mm, an inner diameter of 30.5mm and a height of 40mm ;

[0030] 2) Immerse the cylindrical industrial pure iron processed in the first step completely in liquid nitrogen and keep it for 18 minutes;

[0031] 3) First place the carbon steel cladding sleeve on the workbench, quickly take out the industrial pure iron in the liquid nitrogen and put it into the inner hole of the carbon steel cladding sleeve on the workbench, start the 2000kg air hammer to it at high speed Forging, the number of forging is 1 time, the striking speed is 3.48m / s, and the primary deformation of cylindrical carbon steel sheath and industrial pure iron is controlled to 90%;

[0032] 4) Remove the impact-treated sample from the workbench, put it into a common heat...

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Abstract

The invention belongs to the technical field of preparation of nanocrystalline block materials, and discloses a preparation method of the full-density nanocrystalline pure iron block material. According to the method, the full-density nanocrystalline pure iron block material is prepared by using common industrial pure iron as a raw material in a combined technical means of heavy-load impact and annealing treatment under the liquid nitrogen temperature. The method is simple in process, convenient to operate, high in preparation efficiency and high in economical efficiency; moreover, specialized production equipment is not needed. The nanocrystalline block material prepared by using the method is various in types, and is suitable for materials of copper, carbon structural steel, titanium and the like except for pure iron.

Description

technical field [0001] The invention relates to the technical field of preparation of nanocrystalline bulk materials, in particular to a method for preparing fully dense nanocrystalline pure iron bulk materials. Background technique [0002] Bulk nanometal materials, as an important nanomaterial, have attractive application prospects and are one of the hotspots in nanomaterials research. The research focuses on the preparation, microstructure and intrinsic properties of bulk nanometal materials. [0003] The preparation methods of bulk nano-metal materials can usually be divided into two categories, one is a two-step method, the nanoparticles are first prepared, and then prepared by in-situ pressing, hot isostatic pressing, hot extrusion, thermal spraying, etc. Bulk nanomaterials; the other is a one-step method, which directly prepares ordinary materials into bulk nanomaterials, such as amorphous crystallization, electrodeposition, and melt solidification (including high-tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
Inventor 罗伟严密王琪明宫海龙马天宇吴琛姜银珠
Owner ZHEJIANG UNIV