Precipitation hardening stainless steel of surface laser alloy and its preparation process and application

A laser alloying and precipitation hardening technology, applied in metal material coating process, coating and other directions, can solve the problems of low surface hardness and poor erosion resistance, and achieve good surface quality, good forming and easy promotion. Effect

Active Publication Date: 2009-06-17
HANGZHOU BOHUA LASER TECH
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  • Abstract
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Problems solved by technology

[0005] In order to solve the technical defects of low surface hardness and poor erosion resistance of 17-4PH stainless steel, an object of the present invention is to provide a method that can greatly improve the surface hardness of precipitation hardening stainless steel while maintaining the original various properties of the substrate. Precipitation-hardening stainless steel materials with excellent indicators greatly broaden the application range of precipitation-hardening stainless steel materials

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  • Precipitation hardening stainless steel of surface laser alloy and its preparation process and application

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Embodiment 1

[0025] Combine below figure 1 A detailed description of the embodiment of the present invention: 1 is the laser beam, 2 is the shielding gas, 3 is the workpiece, and 4 is the moving direction of the laser beam. The workpiece material is 17-4PH stainless steel, which is a kind of precipitation hardening stainless steel with excellent comprehensive performance after solid solution (1020-1060°C) and aging (500-580°C) treatment. After the surface is cleaned twice with 98% acetone, a layer of alloy coating with a width of 16 mm and a thickness of 0.4 mm is pre-coated. The alloy coating contains W 52%, Co 18%, Cr 20%, Ni 8%, Fe 1%, Si 1%, after drying, carry out laser treatment.

[0026] The source of the laser beam is CO 2 Laser with a wavelength of 10.6 μm and a power density of 7.8×10 3 W / cm 2 , the laser is irradiated vertically on the workpiece surface. The size of the light spot is 16×2mm, and the defocus amount is 0. During processing, the workpiece remains still, the l...

Embodiment 2

[0030] In the material is 17-4PH, the original hardness is HV 0.2 The back arc side of the QD238 blade of 380 is cleaned and coated with an alloy coating with a width of 18mm and a thickness of 0.5mm. The alloy coating contains W 56%, Co 20%, Cr 15%, Ni 7%, Fe 0.8% , Si 1.2%. According to the blade profile programming, its laser treatment process parameters are power density 8.3×10 3 W / cm 2 , V=8mm / s, the spot size is 12×2mm; after laser treatment, take 5 points to obtain the hardness as HV 0.2 : 882, 898, 995, 876, 781, an alloyed layer with an alloyed layer depth of 60 μm. The blade treated by this method is installed and used, and the results show that its water cavitation resistance performance is obviously improved, and it is safe and reliable.

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Abstract

The invention relates to a precipitation hardening stainless steel material with laser alloying surface manufacturing technology and its application. It is made up precipitation hardening stainless steel basal body and alloying coating which is processed by alloying technology for paint contains W, Co, Cr, Ni alloy powder. The processed precipitation hardening stainless steel remains original better comprehension mechanical property, and has high surface hardness. Thus it has wide application range. The 17-4PH stainless steel is fit for making turbine blade.

Description

technical field [0001] The invention relates to a precipitation-hardening stainless steel material, in particular to a precipitation-hardening stainless steel material whose surface is alloyed by laser and its preparation process and application. Background technique [0002] Laser alloying is the use of laser to melt the surface of the base metal, and at the same time add alloy elements, the base is used as the solvent, the alloy elements are used as the solute, and a layer of alloy layer with a relatively high concentration and a fairly uniform alloy layer is formed on the base, so as to achieve the required wear resistance. Corrosion resistance, high temperature resistance, oxidation resistance and other special properties. The use of laser surface alloying technology can prepare wear-resistant, corrosion-resistant and high-temperature-resistant surface alloys on the surface of some base metals with poor surface properties and cheap prices, which can be used to replace ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C30/00C21D1/09
Inventor 姚建华楼程华
Owner HANGZHOU BOHUA LASER TECH
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