Surface composite strengthening technology for precipitation hardening stainless steel and precipitation hardening stainless steel material

A technology of precipitation hardening and surface compounding, applied in the field of surface compound strengthening of precipitation hardening stainless steel, can solve the problem of not meeting the requirements of blades, improve surface hardness and anti-cavitation performance, improve tempering resistance and high surface hardness. Effect

Active Publication Date: 2011-01-26
姚建华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for blades of such materials, a single laser processing method still cannot meet the requirements of actual blades.

Method used

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  • Surface composite strengthening technology for precipitation hardening stainless steel and precipitation hardening stainless steel material
  • Surface composite strengthening technology for precipitation hardening stainless steel and precipitation hardening stainless steel material
  • Surface composite strengthening technology for precipitation hardening stainless steel and precipitation hardening stainless steel material

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 A surface composite strengthening process for precipitation hardening stainless steel is shown, in which, 1 is the first laser beam, 2 is the second laser beam, 3 and 4 are gas protection devices, 5 is the moving direction of the laser beam, and 6 is the artifact. Work piece 6 is made of 17-4PH stainless steel. After the surface is cleaned twice with 98% acetone, a layer of alloy coating with a width of 16mm and a thickness of 0.4mm is preset, and the composition is W6%, Cr19%, Ni10%, Fe7%. , Si1.2%, V0.8%, Re0.1%, remaining Co, after drying, carry out laser treatment.

[0028] The source of the laser beam is CO 2 Laser with a wavelength of 10.6 μm and a power density of the first laser beam of 1.875 kW / cm 2 , the spot size is 16mm×10mm, and the protective medium is argon. The power density of the second laser beam is 6kW / cm 2, the spot size is 16mm×3mm, and the synchronous scanning speed is 200mm / min. Treated at 440°C / 2 hours. Finally, the highe...

Embodiment 2

[0031] Coating a layer of alloy coating with a width of 12mm and a thickness of 0.5mm on a 17-4PH stainless steel substrate, the composition is: W8%, Cr20%, Ni12%, Fe8%, Si1.5%, V0.5% , Re0.1%, Yu Co. After drying, and then laser treatment, the power density of the first beam is 1.625kW / cm 2 , The spot size is 12mm×8mm, and the cooling medium is argon. The aging temperature is 440°C, 4h; the power density of the second beam is 9kWcm 2 , the spot size is 12mm×1mm, and the synchronous scanning speed is 300mm / min. Finally, the average hardness of the alloyed surface is obtained as HV 0.2 650, the hardened layer is 150μm; the average hardness of the subsurface is HV 0.2 410, the depth of the hardened layer is 1.5mm, and the anti-cavitation performance is about 3 times higher than that of the original matrix.

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Abstract

The invention discloses a surface composite strengthening technology for precipitation hardening stainless steel and a precipitation hardening stainless steel material processed by the technology. In the technology, two laser beams are utilized to carry out controllable selection deep-layer solid solution and alloying composite strengthening treatment on a substrate synchronously, thus solving the problem existing when two techniques of solid solution and alloying are synchronously composited, and the invention also provides a laser treatment method which not only has high local fatigue resistance and high solid solution strengthening depth but also obtains higher surface hardness, wear resistance and anti-cavitation performance, so that the overall strengthening layer depth, performance and hardening gradient of the material at a processing area are controlled, and the application range of the precipitation stainless steel is enlarged.

Description

technical field [0001] The invention relates to a precipitation hardening stainless steel material, in particular to a surface composite strengthening technology of precipitation hardening stainless steel. Background technique [0002] Precipitation-hardened stainless steel has the advantages of high specific strength, high yield ratio, both strength and toughness, excellent elastic properties, good corrosion resistance and thermal stability, excellent processing formability and welding performance, and has been widely used in aviation, aerospace, Machinery manufacturing, atomic energy and other important fields. In particular, high-strength aging stainless steel with superimposed effects of carbon-free martensitic phase transformation strengthening and aging strengthening is widely used in large-capacity turbine components, nuclear reactor components, rocket engine casings, missiles and aircraft and other important industrial equipment or weapons important components of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00
Inventor 姚建华叶诗豪
Owner 姚建华
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