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Printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel

A laser additive and alloy steel technology, applied in the field of additive manufacturing, can solve the problems of no mass production, waste of resources, complex structure, etc., and achieve the effect of reducing research and development costs, improving mechanical properties, and improving internal organizational structure.

Active Publication Date: 2021-05-18
NANJING CHENGUANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many high-end alloy steel parts have complex structures and are not used in mass production. The traditional casting method is costly and wastes resources. To solve this problem, this invention proposes a method that uses laser additive manufacturing combined with hot isostatic pressing and Its related post-heat treatment method replaces the traditional casting method to complete the forming of special parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the present invention, the printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel comprises the following steps:

[0024] Printing process steps: use selective laser melting (SLM) equipment, set the scanning speed to 1000mm / s, the printing power to 150W, the powder diameter to 15-53μm, and the printing layer thickness to 25μm for printing.

[0025] The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 600°C for atmospheric pressure air cooling to room temperature; then annealing at 670°C for 5 hours, furnace cooling to 400°C for atmospheric pressure air cooling to room temperature.

[0026] Hot isostatic pressing step: determine the hot isostatic pressing process according to the temperature of the phase transition point of the alloy steel and the density of the deposited state, sample size, and microstructure. When selecting the hot isostatic pressing temperature, according to the phase transit...

Embodiment 2

[0032] In the present invention, the printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel comprises the following steps:

[0033] Printing process steps: use selective laser melting (SLM) equipment, set the scanning speed to 800mm / s, the printing power to 120W, the powder diameter to 15-53μm, and the printing layer thickness to 20μm for printing.

[0034] The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 650°C for atmospheric pressure air cooling to room temperature; then annealing at 700°C for 5 hours, furnace cooling to 400°C for atmospheric pressure air cooling to room temperature.

[0035] Hot isostatic pressing step: under the pressure of 120MPa, after the first heat treatment, the printed sample was kept at 1100°C for 4 hours, then cooled to 400°C at 20°C / min and then depressurized and air-cooled to room temperature;

[0036] After testing, the product obtained in the hot isostatic pressing s...

Embodiment 3

[0040] In the present invention, the printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel comprises the following steps:

[0041] Printing process steps: Selected laser melting (SLM) equipment is used, the scanning speed is set to 1200mm / s, the printing power is 150W, the powder diameter is 15-53μm, and the printing layer thickness is 15μm for printing.

[0042]The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 550°C for atmospheric pressure air cooling to room temperature; then annealing at 650°C for 5 hours, furnace cooling to 350°C for atmospheric pressure air cooling to room temperature.

[0043] Hot isostatic pressing step: under the pressure of 120MPa, after the first heat treatment, the printed sample was kept at 1000°C for 4 hours, then cooled to 300°C at 20°C / min and then depressurized and air-cooled to room temperature;

[0044] After testing, the product obtained in the hot isostatic pres...

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Abstract

The invention relates to a printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel. The method comprises a printing process step, a first heat treatment step, a hot isostatic pressing step and a second heat treatment step. According to the method, novel printing process parameters are developed for the 40CrNi2Si2MoVA alloy steel, the occurrence frequency of printing cracks is effectively reduced, one-time forming of ultra-high-strength steel parts with complex structures is achieved, the follow-up machining allowance is reduced, a development period is shortened, the research and development cost is reduced, and the production requirements of products with complex structures and low demand quantity are met. And meanwhile, on the basis of additive manufacturing, the defects are overcome through hot isostatic pressing and heat treatment methods, and the mechanical property of the material is further improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, in particular to a printing and post-processing method for manufacturing 40CrNi2Si2MoVA alloy steel by laser additive manufacturing. Background technique [0002] my country's aerospace industry has developed vigorously in recent years, especially in the field of hypersonic vehicles, and has made a series of remarkable achievements. Hypersonic aircraft is a new project of cutting-edge technology being developed in this century. It is also known as the "Near Space Hypersonic Vehicle" (NSHV). The flight altitude of this aircraft can be 20-100km from the ground in the atmospheric space, which is located below the low-orbit satellite orbit and above the flight altitude of general aircraft, including the atmospheric stratosphere, mesosphere and part of the thermosphere. The flight speed of a hypersonic vehicle is higher than 5 times the speed of sound (ie Mach 5), or more than 6000 km...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/64B22F10/66B33Y10/00B33Y40/20
CPCB22F3/15B22F3/24B33Y10/00B33Y40/20B22F2003/248Y02P10/25
Inventor 胡伟叶丁陵柏久阳王国强张峰王皓冉
Owner NANJING CHENGUANG GRP
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