Laser cladding method for strengthening surface of piercing point

A technology of laser cladding and perforated plugs, which is applied in the coating process and coating of metal materials, can solve the problems of unsatisfactory preparation cost and performance, insufficient bonding strength, and low cost, and achieve excellent high-temperature oxidation resistance. Good wettability and hardness improvement effect

Active Publication Date: 2009-09-02
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing needs to be carried out in a vacuum, the cost is high, and the bonding strength with the substrate is insufficient, especially the effective thickness of the coating is micron level, it is difficult to withstand the long working time of the plug, and harmful impurities will penetrate into the coating during use. Corrosion and damage, or partial tearing in the early stages of use
[0006] In summary, the exist

Method used

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  • Laser cladding method for strengthening surface of piercing point
  • Laser cladding method for strengthening surface of piercing point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for strengthening the surface of a perforated plug by laser cladding. The process includes the following steps:

[0028] (1) Sample pretreatment: remove the working surface of the plug head, blacken it, and then preheat the plug at 500°C for 3.5 hours; (2) Prefabrication of the cladding powder: the base Co50 and Ni are coated with the WC ceramic reinforcing phase according to the mass ratio The two powders are mixed with 15wt.% WC and dried in a grinding dish after being fully ground; (3) Laser cladding process: the laser power is adjusted to 2.4kW, the laser scanning speed is 220mm / min, and the laser spot The diameter is 5mm, and the overlap rate of laser scanning passes is 40%. At the same time, under the action of the laser, the prefabricated composite alloy powder is cladding on the working surface of the head using a reverse synchronous powder feeding method; (4) Follow-up treatment: The perforated plug after laser cladding is placed in a heat treatment furnac...

Embodiment 2

[0030] A method for strengthening the surface of a perforated plug by laser cladding. The process includes the following steps:

[0031] (1) Sample pretreatment: remove the working surface of the plug head, blacken it, and then preheat the plug head at 400°C for 5 hours; (2) Prefabrication of the cladding powder: the base Co50 and Ni are coated with the WC ceramic reinforcing phase according to the mass ratio The two powders are mixed with 10wt.% WC and dried in a grinding dish after being fully ground; (3) Laser cladding process: the laser power is adjusted to 1.8kW, the laser scanning speed is 300mm / min, and the laser spot The diameter is 5mm, and the overlap rate of laser scanning passes is 50%. At the same time, under the action of the laser, the prefabricated composite alloy powder is cladding on the working surface of the head using reverse synchronous powder feeding; (4) Follow-up treatment: The perforated plug after laser cladding is placed in a heat treatment furnace for ...

Embodiment 3

[0033] A method for strengthening the surface of a perforated plug by laser cladding. The process includes the following steps:

[0034] (1) Sample pretreatment: remove the working surface of the plug head, blacken it, and then preheat the plug at 600°C for 3 hours; (2) Prefabrication of the cladding powder: the base Co50 and Ni are coated with WC ceramic reinforcement according to the mass ratio The two powders are mixed with 20wt.% WC and dried in a grinding dish after being fully ground; (3) Laser cladding process: the laser power is adjusted to 3.0kW, the laser scanning speed is 150mm / min, and the laser spot The diameter is 4mm, and the overlap rate of laser scanning passes is 30%. At the same time, under the action of the laser, the prefabricated composite alloy powder is cladding on the working surface of the head by reverse synchronous powder feeding; (4) Follow-up treatment: The perforated plug after laser cladding is placed in a heat treatment furnace for stress relief an...

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Abstract

A laser cladding method for strengthening the surface of a piercing point includes the following steps of: (1) prefabricating WC/Co-base cladding powder; (2) pre-processing the surface of a piercing point workpiece, and cleaning up stain and rust; preheating for 2 to 5 hours at a temperature between 400 DEG C and 600 DEG C; (3) cladding the prefabricated composite powder fed in the way of reverse synchronization or coaxially in multiple steps by a CO2 laser; simultaneously, carrying out synchronous inert gas protection on the laser-cladding area; and (4) subsequent processing. The laser cladding method adopts laser to prepare a WC ceramic particle-strengthened Co-base composite coating on the surface of the piercing point, and the coating is metallically combined with the matrix, so the binding force between the coating and the matrix is enhanced; the maximum thickness of the coating can reach a few millimeters; and as the surfaces of WC particles are coated with Ni, the absorption of laser energy by the WC can be reduced, so that the burnout rate of the WC can be reduced in a laser melting pool. The distribution of the WC particles is uniform in the coating, the rigidity of the coating is high, consequently, the service performance of the piercing point can be improved, and the service life can be prolonged.

Description

Technical field [0001] The invention relates to the technical field of material surface strengthening, in particular to a laser cladding method for strengthening the surface of a perforated plug. Background technique [0002] The perforated plug is a key tool for the production of stainless steel, heat-resistant steel, bearing steel and other special alloy steel pipes. Its service life has a direct impact on the output, quality and production cost of the product. When the head is working, the temperature is about 1000℃, and it is exposed to huge axial pressure, radial pressure, rotational friction, and thermal stress from sudden cooling and heating. It is prone to nose collapse, deformation, and stickiness during use. Failure of steel and cracking. Therefore, it is required to have good wear resistance, high temperature oxidation resistance and chilling and heat resistance to meet the harsh production and use conditions. [0003] At present, a number of patents have been formed i...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 颜永根何宜柱张晖陆明和顾之毅
Owner BAOSHAN IRON & STEEL CO LTD
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