A 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 unnecessary 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: 2022-08-09
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] The printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel in the present invention includes the following steps:

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

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

[0026] Hot isostatic pressing step: determine the hot isostatic pressing process according to the phase transition temperature 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 transition point of the alloy steel ...

Embodiment 2

[0032] The printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel in the present invention includes 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 be 15-53 μm, and the printing layer thickness to be 20 μm to print.

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

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

[0036] After testing, the density of the product obtained in the hot isostatic pressing ste...

Embodiment 3

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

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

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

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

[0044] After testing, the density of the product obtained in the hot isostatic pressing ste...

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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. The invention develops new printing process parameters for 40CrNi2Si2MoVA alloy steel, effectively reduces the frequency of printing cracks, realizes one-time forming of ultra-high-strength steel parts with complex structure, reduces subsequent machining allowance, shortens development cycle, reduces It reduces the cost of research and development and meets the production needs of products with complex structures and low demand. At the same time, on the basis of additive manufacturing, the defects are improved by hot isostatic pressing and heat treatment, so that the mechanical properties of the material are further improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and particularly relates to a printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel. Background technique [0002] my country's aerospace industry has developed vigorously in recent years, especially in the field of hypersonic vehicles, a series of remarkable achievements have been made. Hypersonic vehicles are a new project of cutting-edge technology being developed in this century. It is also known as the "Near Space Hypersonic Vehicle" (NSHV). This kind of aircraft can fly at an atmospheric space of 20-100km above the ground. This space is located below the orbit of low-orbit satellites and above the flight altitude of general aircraft, including the atmospheric stratosphere, mesosphere and part of the thermosphere. A hypersonic vehicle travels at speeds above five times the speed of sound (ie Mach 5), or more than 6,000 km / h. Beca...

Claims

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Application Information

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Patent Type & Authority Patents(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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