High-performance low-temperature efficient ion composite permeation surface modification method for austenitic stainless steel

A technology for surface modification of austenitic stainless steel, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as high service temperature, low nitriding efficiency, and impact on corrosion resistance, and achieve Enhanced surface hardness, increased hardness, and high nitriding efficiency

Pending Publication Date: 2022-03-25
CHANGZHOU UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current austenitic stainless steel ion nitriding technology, when using high temperature ion nitriding (> 450 ℃), its nitriding efficiency is high, but it has a great impact on the corrosion resistance of austenitic stainless steel; while using low temperature (≤ 450 ℃) ) ion nitriding technology does not affect the corrosion resistance of austenitic stainless steel to a certain extent, but there are problems such as low diffusion rate of active atoms at low temperature during low temperature nitriding, resulting in low nitriding efficiency and long nitriding cycle. The methods to solve such problems include laser shock, pre-oxidation, metal composite infiltration, etc., which have a high improvement on the structure and performance of the infiltrated layer. Among them, the existing metal composite infiltration technology uses a high temperature, which will affect the austenite The corrosion resistance of stainless steel has a great influence

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
  • High-performance low-temperature efficient ion composite permeation surface modification method for austenitic stainless steel
  • High-performance low-temperature efficient ion composite permeation surface modification method for austenitic stainless steel
  • High-performance low-temperature efficient ion composite permeation surface modification method for austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Cut the 304 stainless steel into a sample with a size of 10mm×10mm×5mm.

[0033] (2) The samples were polished to the mirror surface with 600#~2000# SiC sandpaper in turn, soaked in absolute ethanol and ultrasonically cleaned for 10 minutes to remove surface oil and other impurities, and dried for later use.

[0034] (3) Put the sample into a vacuum nitriding furnace, add TC4 wire around the surface of the sample, specifically: add 200 mg around the surface of each gram of sample, and perform sputter cleaning for 30 minutes first.

[0035] (4) After the sputter cleaning is completed, low-temperature ion nitriding is performed at a given process parameter of 420°C / 4h. The model of the vacuum nitriding furnace is LDMC-8CL, the flow ratio of nitrogen and hydrogen is 1:3, and the total flow of nitrogen and hydrogen mixed gas is 700ml / min;

[0036] (5) Take out the sample after the ion composite infiltration treatment, and use an optical metallographic microscope to obs...

Embodiment 2

[0041] (1) Cut the 304 stainless steel into a sample with a size of 10mm×10mm×5mm.

[0042] (2) The samples were polished to the mirror surface with 600#~2000# SiC sandpaper in turn, soaked in absolute ethanol and ultrasonically cleaned for 10 minutes to remove surface oil and other impurities, and dried for later use.

[0043] (3) Put the sample into a vacuum nitriding furnace, add TC4 wire around the surface of the sample, specifically: add 250 mg around the surface of each gram of sample, and first perform sputter cleaning for 30 minutes.

[0044] (4) After the sputter cleaning is completed, low-temperature ion nitriding is performed at a given process parameter of 420°C / 4h. The model of the vacuum nitriding furnace is LDMC-8CL, the flow ratio of nitrogen and hydrogen is 1:3, and the total flow of nitrogen and hydrogen mixed gas is 700ml / min;

[0045] (5) Take out the sample after the ion composite infiltration treatment, and use an optical metallographic microscope to obs...

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

No PUM Login to view more

Abstract

The invention belongs to the technical field of metal surface treatment, relates to a high-performance low-temperature efficient ion composite nitriding surface modification method for austenitic stainless steel, and aims to solve the problems that CrN can be separated out through high-temperature ion nitriding, solid solution chromium is reduced, and the corrosion resistance of the austenitic stainless steel is reduced. The diffusion speed of active atoms at low temperature is low, so that the nitriding efficiency is low. The method comprises the following steps: cutting original austenitic stainless steel into a sample; grinding the sample, ultrasonically cleaning the sample in an organic solvent, and drying the sample; the sample is put into a vacuum nitriding furnace, and TC4 wires are added around the sample for ion composite nitriding treatment. According to the low-temperature ion composite permeation surface modification method, CrN is prevented from being formed, and the excellent corrosion resistance of the austenitic stainless steel is kept; an S phase and a Ti2N phase are formed on the surface of the austenitic stainless steel, so that the surface hardness of the austenitic stainless steel is greatly improved; and meanwhile, the ion nitriding efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a high-performance low-temperature high-efficiency ion composite infiltration surface modification method for austenitic stainless steel. Background technique [0002] Austenitic stainless steel is widely used in petroleum, chemical, marine, pharmaceutical, food and other industries because of its good corrosion resistance. Components usually fail prematurely due to surface wear and are difficult to meet the requirements of use, so their popularization and application are greatly limited. [0003] Ion nitriding technology is a widely used nitriding process in production at present. This technology can significantly improve the surface hardness, wear resistance, fatigue resistance and corrosion resistance of materials, and has uniform permeation layer, simple process, and small deformation of workpieces. and non-polluting advantages. However, the curr...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02
CPCC23C12/02
Inventor 胡静李润涛魏坤霞
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