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Method of assistance of resistance heating in surface mechanical grinding to form gradient nanostructure

A surface mechanical grinding and resistance heating technology, applied in the direction of improving process efficiency, can solve the problems such as the inability to effectively eliminate the fatigue source of the surface layer of the metal workpiece and the shallow plastic deformation layer, and achieve the improvement of plasticity, easy temperature control, and improvement of surface quality. Effect

Inactive Publication Date: 2019-03-12
INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the plastic deformation layer induced by the surface mechanical grinding treatment is relatively shallow, which cannot effectively eliminate the initiation of fatigue sources below the surface of the metal workpiece.

Method used

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  • Method of assistance of resistance heating in surface mechanical grinding to form gradient nanostructure
  • Method of assistance of resistance heating in surface mechanical grinding to form gradient nanostructure
  • Method of assistance of resistance heating in surface mechanical grinding to form gradient nanostructure

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of example that uses above-mentioned method to prepare 316L stainless steel surface layer gradient nanostructure, its steps are:

[0027] (1) Two 316L stainless steel plates with a thickness of 5mm were selected. Both plates were vacuum annealed at 900°C for 3 hours, and they were recorded as sample 1 and sample 2 respectively. Sample 1 was a comparative sample.

[0028] (2) Grind and polish the upper surfaces of the two samples in step (1) with 400#, 600#, 800#, 1000#, 1200#, 1500# and 2000# sandpaper in order to remove the oxidation on the surface of the metal workpiece Layer, and then ultrasonically cleaned with deionized water to remove abrasive debris and dirt on the surface of the metal workpiece.

[0029] (3) Perform surface mechanical grinding treatment on sample 1, wherein the surface mechanical grinding treatment parameters are as follows: the diameter of the steel shot is 8 mm, the roughness of the steel shot is Ra 1.6, the vibration frequency is 50 Hz...

Embodiment 2

[0033] A kind of example that uses above-mentioned method to prepare industrial pure copper surface layer gradient nanostructure, its steps are:

[0034] (1) Select two industrial pure copper plates with a thickness of 5mm (purity>99.9wt.%). After the two plates are vacuum annealed at 700°C for 2 hours, they are respectively recorded as sample 3 and sample 4. Among them, the sample 3 is a comparative sample.

[0035] (2) Grind and polish the upper surfaces of the two samples in step (1) with 400#, 600#, 800#, 1000#, 1200#, 1500# and 2000# sandpaper in order to remove the oxidation on the surface of the metal workpiece Layer, and then ultrasonically cleaned with deionized water to remove abrasive debris and dirt on the surface of the metal workpiece.

[0036] (3) Perform surface mechanical grinding treatment on sample 3, wherein the surface mechanical grinding treatment parameters are as follows: the diameter of the steel shot is 8 mm, the roughness of the steel shot is Ra 1.6...

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Abstract

The invention relates to the technical field of surface engineering technology and laser processing, in particular to a method of assistance of resistance heating in surface mechanical grinding to form a gradient nanostructure. A workpiece resistance heating method is adopted to heat a metallic workpiece, the temperature is controlled within the dynamic recrystallization temperature range, and after heating, the surface mechanical grinding treatment process is immediately adopted to carry out large-area intensification on the metallic workpiece to obtain the gradient nanostructure with a higher degree.

Description

technical field [0001] The invention relates to the technical fields of surface engineering technology and surface mechanical grinding, in particular to a method for forming gradient nanostructures through resistance heating assisted surface mechanical grinding. Background technique [0002] Nano-metal materials have the advantages of high strength and hardness, good physical properties, wear properties and thermal processing properties. However, with the significant increase in strength and hardness, the plasticity and toughness of nanostructured materials are significantly reduced, the work hardening ability disappears, and the structural stability becomes poor. The above shortcomings restrict the application and development of nanostructured materials. With the development of high-strength and lightweight engineering structures, traditional homogeneous materials, such as coarse-grained materials and nano-crystalline materials, cannot meet the performance requirements of e...

Claims

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Application Information

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IPC IPC(8): C21D7/13C21D1/34B24B1/00B24C1/10
CPCB24B1/00B24C1/10C21D1/34C21D7/13Y02P10/20
Inventor 薛伟吴刘军鲁金忠罗开玉薛遥
Owner INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV
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