Method for obtaining expansion Alpha phase on surface of stainless steel

A technology of stainless steel and atmosphere, which is applied in the field of stainless steel surface modification treatment process, can solve the problems of reducing the corrosion resistance of martensitic stainless steel, and achieve the effects of high hardness, short production cycle and easy industrial production

Inactive Publication Date: 2018-03-27
HARBIN ENG UNIV
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Problems solved by technology

However, the corrosion resistance of martensitic stainless steel is reduced due to the formation of more phases in the surface penetration layer.

Method used

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  • Method for obtaining expansion Alpha phase on surface of stainless steel
  • Method for obtaining expansion Alpha phase on surface of stainless steel
  • Method for obtaining expansion Alpha phase on surface of stainless steel

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specific Embodiment approach 1

[0025] Specific embodiment one: a kind of process method that obtains homogeneous carbon-containing " expanding " α phase layer on the surface of 2Cr13 martensitic stainless steel, this process comprises the following steps: 1, 2Cr13 martensitic stainless steel is carried out solid solution treatment, make Homogenize the stainless steel structure; 2. Polish the surface oxide layer with 240#~800# SiC sandpaper on the surface of the stainless steel workpiece, and then perform ultrasonic cleaning on the stainless steel workpiece in ethanol, acetone and deionized water in sequence to remove oil and impurities on the surface of the workpiece, and dry 3. Put the stainless steel workpiece into the plasma multi-component co-infiltration furnace, evacuate to below 10Pa, feed a very small amount of dried hydrogen gas, start the glow and heat up, and perform plasma cleaning at the same time; 4. The temperature reaches 100 At ℃, acetone steam is introduced, the ratio of acetone and hydroge...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the carburizing temperature in step 4 is 500° C. and the temperature is kept for 4 hours. Other steps and parameters are the same as those in Embodiment 1. By means of this embodiment a modified layer containing carbon "expanded" alpha phase is obtained.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the ratio of acetone and hydrogen introduced in step 4 is 2:4, and the pressure in the furnace is 300Pa. Other steps and parameters are the same as those in Embodiment 1. By means of this embodiment a modified layer containing carbon "expanded" alpha phase is obtained.

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Abstract

The invention provides a method for obtaining the expansion Alpha phase on the surface of stainless steel. The method includes the steps that a pretreated stainless steel material is put into a plasmamulti-element penetration furnace, vacuum pumping is conducted to 10Pa or below, hydrogen is connected in and luminance build-up temperature rising is carried out; after the temperature reaches 200-250 DEG C, a nitrogen-containing atmosphere or a carbon-containing atmosphere or a nitrogen-carbon-containing atmosphere is connected in, the volume ratio of the nitrogen-containing atmosphere or the carbon-containing atmosphere or the nitrogen-carbon-containing atmosphere to nitrogen is adjusted, the furnace pressure is made to be 200-1000Pa, timing begins when the temperature is 300-500 DEG C, and the air exhaust state is maintained during the period; and after heat preservation lasts for 1-16h, hydrogen is stopped from being connected in, the nitrogen-containing atmosphere or the carbon-containing atmosphere or the nitrogen-carbon-containing atmosphere is stopped from being connected in after the temperature is lower than 200 DEG C, furnace cooling is conducted below 40 DEG C and furnacedischarging is performed. A modified layer with the nitrogen-carbon-containing 'expansion' Alpha phase is obtained on the surface of the stainless steel treated by the technological method, the hardness and abrasive resistance of the surface of the stainless steel treated through the method are improved obviously, and the corrosion resistance of the stainless steel cannot be influenced.

Description

technical field [0001] The invention relates to a method for modifying the surface of metal materials, in particular to a stainless steel surface modification process. Background technique [0002] Nitriding / carburizing / nitrocarburizing and other processes are chemical heat treatment processes that infiltrate interstitial atoms (nitrogen, carbon, etc.) into the surface of metal materials to change the chemical composition and microstructure of the metal material surface. Generally, a dense compound layer can be formed on the surface of the modified metal material. This compound layer has high hardness and wear resistance, and can greatly improve the service life of the metal workpiece, so it has been widely used. [0003] Stainless steel is a FeCr alloy with a Cr content of more than 10.5%. In order to improve the surface properties of stainless steel, a series of researches have been carried out on the surface modification technology of stainless steel, and many modificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32C23C8/22C23C8/26
CPCC23C8/32C23C8/22C23C8/26
Inventor 刘瑞良韦朝阳徐昂丛志翔
Owner HARBIN ENG UNIV
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