Hardening technology for precipitation hardening stainless steel laser surface

A technology of precipitation hardening and stainless steel, which is applied in the field of metal surface hardening, can solve the problems of easy corrosion and peeling of the hardened layer, change the chemical composition of the material surface, etc., achieve good strength and toughness, improve surface hardness, and facilitate hardening treatment.

Inactive Publication Date: 2008-12-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the problems of deformation during nitriding treatment, changing the chemical composition of the material surface, and easy corrosion and peeling of the hardened layer, and at the same time realizes that the depth and hardness of the laser surface hardened layer can be controlled

Method used

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  • Hardening technology for precipitation hardening stainless steel laser surface
  • Hardening technology for precipitation hardening stainless steel laser surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, laser hardening treatment is carried out on 17-4PH steel. First, the surface of precipitation hardened stainless steel is cleaned, and it is subjected to constant temperature treatment. After reaching the designed temperature, a beam of light spot is selected according to the geometric configuration of the treated surface for laser treatment. , so that the surface is rapidly fused, and at the same time cover the laser action area with a low-temperature protective gas to control the melting rate of the laser action area, and then perform heat treatment on the fusion area.

[0025] 1. Clean the surface of the treatment area: use acetone, alcohol or pine water to remove oil stains;

[0026] 2. Workpiece constant temperature treatment: temperature 20 ℃, holding time 0.5 hours;

[0027] 3. Laser treatment: continuous laser irradiation, optical power 500W, power density 10 4 W / cm 2 , scanning speed 3m / min; light spot Φ1.5mm, overlap 50%, 0 ℃ argon protec...

Embodiment 2

[0031] This embodiment carries out laser hardening treatment to 17-4PH steel, and the difference with embodiment 1 is:

[0032] 1. Workpiece constant temperature treatment: temperature 0 ℃, holding time 8 hours;

[0033] 2. Laser treatment: laser pulse irradiation, pulse energy 30J, pulse frequency 30Hz, pulse width 1ms, overlap 40%, irradiation spot Φ2mm; 4 ℃ argon gas protection;

[0034] 3. Auxiliary heat treatment: temperature 600 ℃, holding time 4 hours, air cooling, precipitation and uniform dispersion of ε-Cu phase;

[0035] Such as figure 2 As shown, the microhardness of the laser treatment area on the surface of the workpiece can reach HV470, and the depth of the hardened layer in this embodiment is 0.4mm.

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Abstract

In the invention, a specific wave-length laser is used for scanning radiation on the surface of the precipitation hardening stainless steel within a certain condition, so, making the surface of said steel to smelt. Low temperature shield gas is used for being cover onto the scanned area, for speeding-up the cooling. After that, the steel is subjected to heat treatment, so the hardness of the surface in a certain thickness is harder than that of the main body of the steel.

Description

technical field [0001] The invention relates to metal surface hardening technology, specifically a precipitation hardening stainless steel surface laser hardening process, which is suitable for surface hardening strengthening of 17-4PH precipitation hardening stainless steel, and is also suitable for other precipitation hardening stainless steels similar to 17-4PH precipitation hardening stainless steel in different chemical compositions. Increased surface hardness under variable conditions. Background technique [0002] Precipitation hardening stainless steel, compared with ordinary martensitic stainless steel, has higher strength and toughness, better weldability, cold workability and corrosion resistance, so it is widely used in the production of heavy loads under chemical corrosion environments Or the key parts of impact load. However, because the precipitation hardening hardness of this type of steel is inconsistent with the toughness of the steel, it is difficult to ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09C21D1/74C21D11/00
Inventor 王茂才谢玉江王东生吴维
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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