Strengthened coating in sandwich-like structure on surface of precipitation hardening stainless steel

A precipitation hardening, stainless steel technology, applied in the direction of coating, metal material coating process, layered products, etc., can solve the problem of no impact stress buffer zone, strengthening layer damage, falling off, etc., to achieve a wide range of applications, improve surface hardness Effect

Active Publication Date: 2013-04-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] How can the above problems be avoided? The traditional high-hardness strengthening layer on the surface is usually thin. Although the short-term strengthening effect is better, the underlying layer is usually the matrix without an impact stress buffer zone. Therefore, the strengthening layer is easily damaged and peeled off under high-strength impact loads, resulting in The substrate is exposed to the eroded surface, which accelerates the damage, and the thinner surface strengthening layer is not conducive to the long-term operation stability and safety of the equipment

Method used

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  • Strengthened coating in sandwich-like structure on surface of precipitation hardening stainless steel
  • Strengthened coating in sandwich-like structure on surface of precipitation hardening stainless steel
  • Strengthened coating in sandwich-like structure on surface of precipitation hardening stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Reinforcing material specially used for surface pre-coating, the composition is: mixed metal oxide (Al 2 o 3 : TiO 2 =1:3) 40%, WC15%, Co9%, Cr9%, Ni3%, the rest is binder (502 glue: E-44 type epoxy resin=3:1).

[0032] 2. Laser treatment, laser power 1200W, spot size 12×1mm, scanning speed 0.3m / min, overlap 10%, using Ar gas to protect the laser irradiation area.

[0033] 3. Auxiliary heat treatment: heat treatment temperature is 450°C, holding time is 3 hours, air cooling.

[0034] Such as figure 2 As shown, within 3mm of the surface of the workpiece, a sandwich-like composite reinforced layer with three layers of "hard-soft-hard" can be obtained, in which the maximum surface hardness is greater than 590HV, and the hardness of the base hardened layer is between 350-500HV and shows Gradient descending trend, the total strengthening depth of the composite strengthening layer is greater than 1.2mm.

Embodiment 2

[0036] 1. Reinforcing material specially used for surface pre-coating, the composition is: mixed metal oxide (Al 2 o 3 : TiO 2 =1:3) 26.7%, VC33%, WC10%, Co6%, Cr6%, Ni2%, the rest is binder (502 glue: epoxy resin=3:1).

[0037] 2. Laser treatment, laser power 2100W, spot size 9×1mm, scanning speed 500mm / min, overlap 10%, using Ar gas to protect the laser irradiation area.

[0038] 3. Auxiliary heat treatment: heat treatment temperature is 450°C, holding time is 3 hours, air cooling.

[0039] Such as image 3 As shown, within 3 mm of the surface of the workpiece, a sandwich-like composite strengthening layer with three layers of "hard-soft-hard" can be obtained, in which the maximum surface hardness is greater than 650HV, and the hardness of the base hardened layer is between 350 and 500HV and shows Gradient descending trend, the total strengthening depth of the composite strengthening layer is greater than 0.8mm.

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Abstract

The invention discloses a strengthened coating in a sandwich-like structure on the surface of precipitation hardening stainless steel, wherein the strengthened coating comprises a surface high-hard layer, a functional softened layer and a substrate hardened layer, and is characterized by the sandwich-like structure consisting of a hard layer, a soft layer and a hard layer; the surface high-hard layer is 10-80 micrometers in thickness, the functional softened layer is 1-100 micrometers in thickness, and the substrate hardened layer is 10 micrometer to 6mm in thickness; and the substrate hardened layer is combined with the precipitation hardening stainless steel substrate. The strengthened coating in the sandwich-like structure provided by the invention can simultaneously provide thick strengthened layer while improving the surface hardness of the precipitation hardening stainless steel, thus being beneficial to long-term stable operation.

Description

(1) Technical field [0001] The invention belongs to the strengthening treatment technology for the surface of precipitation hardening stainless steel, and in particular relates to a laser composite strengthening coating with a similar "sandwich" structure on the surface of precipitation hardening stainless steel. (2) Background technology [0002] Precipitation hardening stainless steel is currently mostly used to make shafts, vanes, and various pump valves and other flow components. Parts made of precipitation-hardened stainless steel represented by 17-4PH are currently recognized as an effective strengthening method for overall solution + aging treatment. In use, martensitic transformation is generally produced after solution treatment, and then aging treatment. Fine and dispersed ε-Cu and M precipitated on the martensite matrix 23 C 6 The advantage is that it can obtain a strengthened surface with a large thickness. However, the overall solid solution will inevitably c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C23C24/10
Inventor 王维夫
Owner ZHEJIANG UNIV OF TECH
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