Surface hardening method for martensite stainless steel

A martensitic stainless steel, workpiece surface technology, applied in the direction of ion implantation plating, metal material coating process, coating, etc., can solve the problems of workpiece deformation, affecting product quality, and many conditions that need to be controlled infiltration, to achieve durability High abrasiveness and hardness, no pollution in the processing process, and fast processing speed

Inactive Publication Date: 2011-08-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above surface treatment methods can change the surface characteristics of stainless steel and improve its service life, the disadvantages are: ① the high temperature treatment process causes deformation of the workpiece, and the low vacuum degree during work causes surface oxidation; ② heat treatment and carburizing treatment cause surface deformation of the workpiece. The appearance changes, which

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] A surface hardening method of martensitic stainless steel. First, place the processed martensitic stainless steel workpiece on the workbench of the vacuum chamber of the ion implanter, and evacuate to 2.0×10 -3 ~2.3×10 -3 Pa, use an ion cleaning source to remove the passivation layer on the surface of the workpiece; then inject nitrogen ions into the martensitic stainless steel workpiece from which the surface passivation layer has been removed to obtain surface-hardened martensitic stainless steel.

[0022] The conditions for implanting nitrogen ions are: the degree of vacuum is 1.0×10 -2 ~5.0×10 -2 Pa, the acceleration voltage of the ion source is 80~100KV, and the implantation dose is 5.0×10 18 ~5.0×10 19 ions / cm 2 .

[0023] The working conditions of the cleaning source are: the filament current is 8-10A, the arc voltage is 40-50V, the extraction voltage is 1.2-1.5KV, and the extraction current is 60-70mA.

[0024] In the treatment, the ma...

Example Embodiment

[0028] Example 2

[0029] A surface hardening method of martensitic stainless steel. First, place the processed martensitic stainless steel workpiece on the workbench of the vacuum chamber of the ion implanter, and evacuate to 2.3×10 -3 ~2.5×10 -3 Pa, use an ion cleaning source to remove the passivation layer on the surface of the workpiece; then inject nitrogen ions into the martensitic stainless steel workpiece from which the surface passivation layer has been removed to obtain surface-hardened martensitic stainless steel.

[0030] The conditions for implanting nitrogen ions are: the degree of vacuum is 5.0×10 -3 ~1.0×10 -2 Pa, the acceleration voltage of the ion source is 60~80KV, and the implantation dose is 5.0×10 17 ~5.0×10 18 ions / cm 2 .

[0031] The working conditions of the cleaning source are: the filament current is 8-10A, the arc voltage is 50-60V, the extraction voltage is 1.0-1.3KV, and the extraction current is 50-60mA.

[0032] The treatment is to immer...

Example Embodiment

[0036] Example 3

[0037] A surface hardening method of martensitic stainless steel. First, place the processed martensitic stainless steel workpiece on the workbench of the vacuum chamber of the ion implanter, and evacuate to 2.5×10 -3 ~2.7×10 -3 Pa, use an ion cleaning source to remove the passivation layer on the surface of the workpiece; then inject nitrogen ions into the martensitic stainless steel workpiece from which the surface passivation layer has been removed to obtain surface-hardened martensitic stainless steel.

[0038] The conditions for implanting nitrogen ions are: the degree of vacuum is 1.0×10 -3 ~5.0×10 -3 Pa, the acceleration voltage of the ion source is 40-60KV, and the implantation dose is 5.0×10 16 ~5.0×10 17 ions / cm 2 .

[0039] The working conditions of the cleaning source are: the filament current is 7-9A, the arc voltage is 55-65V, the extraction voltage is 0.8-1.0KV, and the extraction current is 45-50mA.

[0040] The treatment is to immers...

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Abstract

The invention relates to a surface hardening method for martensite stainless steel. In the technical scheme, the surface hardening method comprises the following steps of: putting a processed martensite stainless steel workpiece on a workbench of a vacuum chamber of an ion implanter, vacuumizing until the pressure is between 2.0*10<-3> and 3.0*10<-3>Pa, and removing a passivation layer on the surface of the workpiece by using an ion cleaning source; and implanting nitrogen ions to the martensite stainless steel workpiece of which the surface passivation layer is removed under the conditions that: the vacuum degree is between 5.0*10<-4> and 5.0*10<-2>Pa, the accelerating voltage of the ion source is between 10 and 100 kV, and the implantation dose is between 5.0*10<15> and 5.0*10<19> ions/centimeter<2> to obtain the surface-hardened martensite stainless steel, wherein the operating conditions of the cleaning source include: filament current is between 6 and 10 A, arc voltage is between 40 and 70 V, extraction voltage is between 0.6 and 1.5 kV, and extraction current is between 40 and 70 mA. The surface hardening method has the characteristics of simple process and no pollution in the processing process; and the abrasion performance and hardness of the surface of the product processed by the method are improved substantially, the combination between a hardening layer and a stainless steel substrate is firm, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of surface hardening. Specifically relates to a method for surface hardening of martensitic stainless steel. Background technique [0002] Martensitic stainless steel has high strength and corrosion resistance, so it has been widely used in industrial production. It can be used to manufacture machine parts such as steam turbine blades (1Cr13), steam equipment shafts and tie rods (2Cr13), and parts working in corrosive media such as valves, bolts, etc. (4Cr13); alloy steel with high carbon content (4Cr13 , 9Cr18) are used in the manufacture of medical equipment, table knives, measuring tools, springs, etc. However, since the surface hardness of martensitic stainless steel is not high, scratches are easy to occur on the surface during use, and the wear resistance is poor, which affects the service life. In order to overcome these problems, stainless steel is usually nitriding, carburizing or carbonitriding ...

Claims

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Application Information

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IPC IPC(8): C23C14/48C23C14/54C23C14/02
Inventor 倪红卫邰军凯陈荣生詹玮婷
Owner WUHAN UNIV OF SCI & TECH
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