Large-deformation enhanced rapid ion nitriding method

A technology of ion nitriding and large deformation, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of core strength decrease, surface layer relaxation, surface layer peeling, etc., and achieve strength and hardness The effect of improving, improving chemical activity, and overcoming the decrease in core hardness and deformation

Active Publication Date: 2019-02-22
CHANGZHOU UNIV
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: when the austenitic stainless steel is treated with ion nitriding, the high-temperature heating adopted to accelerate the diffusion will bring negative effects such as core strength reduction and deformation, and the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Large-deformation enhanced rapid ion nitriding method
  • Large-deformation enhanced rapid ion nitriding method
  • Large-deformation enhanced rapid ion nitriding method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] (1) Process the original steel into a plate shape;

[0032] (2) Perform solution treatment on the plate-shaped steel to be nitrided, heat it up to 1050°C for 60 minutes, and then immediately put the sample in water and cool it to room temperature;

[0033] (3) Place the solid-solution nitriding steel on a four-roll experimental rolling mill, and perform cold rolling treatment with 30% of the deformation, resulting in large plastic deformation;

[0034] (4) The steel to be nitrided after large plastic deformation is processed by wire cutting into a sample size of 10mm×10mm×5mm. After polishing, ultrasonic cleaning and drying in organic solvent;

[0035] (5) Place the sample in an ion nitriding furnace, evacuate to less than 10 Pa, pass in hydrogen gas for sputtering for 30 minutes, and maintain the pressure in the furnace at 300 Pa. Next, nitrogen was introduced. The flow rates of nitrogen and hydrogen were 200ml / min and 600ml / min, respectively, the gas pressu...

Example Embodiment

[0038] Example 2

[0039] (1) Process the original steel into a plate shape;

[0040] (2) Perform solution treatment on the plate-shaped steel to be nitrided, heat it up to 1050°C for 60 minutes, and then immediately put the sample in water and cool it to room temperature;

[0041] (3) Put the solid solution to be nitrided steel on a four-roll experimental rolling mill and perform cold rolling treatment with 50% of the deformation, resulting in large plastic deformation;

[0042] (4) The steel to be nitrided after large plastic deformation is processed by wire cutting into a sample size of 10mm×10mm×5mm. After grinding treatment, ultrasonic cleaning and drying in organic solvent;

[0043] (5) Place the sample in an ion nitriding furnace, evacuate to less than 10 Pa, pass in hydrogen gas for sputtering for 30 minutes, and maintain the pressure in the furnace at 300 Pa. Next, nitrogen was introduced. The flow rates of nitrogen and hydrogen were 200ml / min and 600ml / min, respectively, the...

Example Embodiment

[0046] Example 3

[0047] (1) Process the original steel into a plate shape;

[0048] (2) Perform solution treatment on the plate-shaped steel to be nitrided, heat it up to 1050°C for 60 minutes, and then immediately put the sample in water and cool it to room temperature;

[0049] (3) Put the solid solution to be nitrided steel on a four-roll experimental rolling mill, and perform cold rolling treatment with 70% of the deformation to produce large plastic deformation;

[0050] (4) The steel to be nitrided after large plastic deformation is processed by wire cutting into a sample size of 10mm×10mm×5mm. After polishing, ultrasonic cleaning and drying in organic solvent;

[0051] (5) Place the sample in an ion nitriding furnace, evacuate to less than 10 Pa, pass in hydrogen gas for sputtering for 30 minutes, and maintain the pressure in the furnace at 300 Pa. Next, nitrogen was introduced. The flow rates of nitrogen and hydrogen were 200ml / min and 600ml / min respectively, the gas pressur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of metal surface treatment, and relates to a large-deformation enhanced rapid ion nitriding method. The large-deformation enhanced rapid ion nitriding method comprises the specific steps that original steel is machined and cut into a plate shape; plate-shaped to-be-nitrided steel is subjected to solution treatment; solid-solution-state to-be-nitrided steel is placed in a cold rolling machine to be subjected to cold rolling treatment; and the large-plastic-deformation to-be-nitrided steel obtained after cold rolling treatment is machined and cut intoa sample, and then ion nitriding treatment is conducted. According to the method, the large plastic deformation treatment is conducted before ion nitriding, the dislocation density in a microstructure is obviously increased, grains are obviously refined, in the nitriding process, a rapid diffusion channel is provided for nitrogen atoms through high-density dislocation and other defects, the ion nitriding efficiency is obviously improved, and the thickness of a nitriding layer is improved; and under the situation that the same nitriding layer depth is obtained, the nitriding time can be greatly shortened, accordingly, the energy is saved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a large deformation enhanced rapid ion nitriding method. Background technique [0002] Austenitic stainless steel has good corrosion resistance, oxidation resistance and high temperature resistance, and is widely used in aviation, aerospace, transportation, chemical and other fields. However, due to its low hardness and poor wear resistance, it often fails prematurely due to surface wear under normal service conditions, which limits its popularization and application. [0003] Ion nitriding technology has been widely used due to the advantages of uniform nitriding layer, simple process, good repeatability and no pollution. Austenitic stainless steel has excellent wear resistance, fatigue resistance and high temperature resistance after nitriding treatment. There are problems such as shallow nitriding layer, low hardness and large hardness gradient, which lead to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21D8/02C23C8/38
CPCC21D8/0205C21D8/0236C21D8/0247C21D8/0278C23C8/38
Inventor 胡静李冬魏伟魏坤霞
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap