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Method for laser additive manufacturing of 12CrNi2 alloy steel

A laser additive and alloy steel technology, applied in the field of materials, can solve the problems of high cost, long cycle, complex crankshaft production process, etc., and achieve the effect of short process, high material utilization rate, and improved mechanical properties

Active Publication Date: 2017-09-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of complex production process, long period and high cost of forging and preparing the crankshaft of nuclear power emergency diesel generator, the present invention provides a method for laser additive manufacturing of high-performance 12CrNi2 alloy steel material

Method used

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  • Method for laser additive manufacturing of 12CrNi2 alloy steel
  • Method for laser additive manufacturing of 12CrNi2 alloy steel
  • Method for laser additive manufacturing of 12CrNi2 alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A 12CrNi2 alloy steel material is prepared by depositing 12CrNi2 alloy steel powder on a substrate material by a laser direct deposition method, and the preparation method comprises the following steps:

[0047] (1) Pretreatment of 12CrNi2 alloy steel powder: Dry and dehumidify the 12CrNi2 alloy steel powder with a constant temperature drying oven. The composition of the steel powder is: according to the mass percentage, the composition is: C: 0.132%, Si: 0.359%, Cr: 0.845%, Ni: 1.9%, Mn: 0.505%, and the balance is Fe; the average particle size It is 75 microns, the powder shape is spherical, and the fluidity is good;

[0048] (2) Pretreatment of substrate materials: first use a grinding wheel to derust the surface of the 200x110x10mm Q235 steel plate to make the surface bright and clean, and then use 100#, 240#, 400#, 600#, 800#, 1000# sandpaper to The surface is polished, using each type of sandpaper to polish for ten minutes, then using acetone to remove oil stains,...

Embodiment 2

[0056] Using the optimal power 1900W optimized in Example 1, a 12CrNi alloy steel cylinder shaft was prepared using laser additive manufacturing technology, the specific method is as follows:

[0057] (1) according to the method described in step (1)~(2) in embodiment 1, 12CrNiAlloy steel powder and Q235 matrix material are carried out pretreatment;

[0058] (2) Laser direct deposition forming: using a semiconductor laser, the processed 12CrNi2 alloy steel powder is laser deposited on the Q235 steel plate, and the specific operations are as follows:

[0059] a) Start the switch of the semiconductor laser and the control switch of the machine tool, put the Q235 steel plate on the sample stage of the semiconductor laser, place the polished surface upwards, measure the distance from the laser source of the semiconductor laser to the bright surface of the Q235 steel plate with a scale, and use Adjust the distance with the manual remote control to make it 304mm (the focal length of...

Embodiment 3

[0077] A method for laser additive manufacturing of 12CrNi2 alloy steel material, comprising the steps of:

[0078] (1) according to the method described in step (1)~(2) in embodiment 1, 12CrNiAlloy steel powder and Q235 matrix material are carried out pretreatment;

[0079] (2) adopt semiconductor laser, the 12CrNi alloy steel powder laser deposition that will handle is on Q235 bulk body, deposition method is with the step (3) of embodiment 1, and wherein, semiconductor laser process parameter is: power 1900W, scanning speed 5mm / s. The powder feeding rate is 6.4g / min, and the defocus is 4mm. Because there is a horizontal transition section between two adjacent deposition layers in the sample prepared by 1900W power, the overlapping rate should be appropriately increased to eliminate the horizontal transition section. Therefore, 40% and 50% of the overlapping rates of the two groups are set. Prepare a single-layer deposition structure under different overlapping ratios, and ...

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Abstract

The invention discloses a method for laser additive manufacturing of a 12CrNi2 alloy steel material. The method comprises the laser direct deposition forming step of adopting a semiconductor laser device for depositing 12CrNi2 alloy steel powder onto a substrate material. According to the method, the 12CrNi2 alloy steel powder is selected, a laser direct deposition forming technical process is optimized, the alloy steel material free of defects such as cracks is prepared, and the material is high in hardness and has good toughness. According to the method, a nuclear power emergency diesel generator crankshaft can be integrally prepared; the technological process is short, the subsequent allowance for machining is small, and the material utilization rate is high; and the problems that in the process of producing the nuclear power emergency diesel generator crankshaft through a traditional forging method, the technological process is complex, the period is long, and the cutting quantity is large are solved. According to the method, the mechanical property of the12CrNi2 alloy steel material can be improved, and the production cost of a forging and pressing mold and the like can be reduced.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for manufacturing 12CrNi2 alloy steel by laser additive manufacturing. Background technique [0002] The nuclear power emergency diesel generator is the last line of defense in the nuclear power plant emergency safety guarantee system. The generator needs to be started within 10s and reach the required rated voltage and rated power to ensure the safe shutdown of the nuclear power plant reactor. The crankshaft of a nuclear power emergency diesel generator is its core component, and the quality and performance of the crankshaft will play a vital role in the safety of the nuclear power plant. [0003] At present, the crankshaft production process of emergency diesel generators for nuclear power plants is forging. The method is to forge the 12CrNi2 alloy steel into a bar, and then carry out mechanical processing to process the bar into a stepped shaft shape, and finally ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F1/00C22C38/02C22C38/04C22C38/40B33Y10/00B33Y70/00
CPCB22F1/0003C22C38/02C22C38/04C22C38/40B33Y10/00B33Y70/00C21D2211/005C21D2211/008B22F10/00B22F10/25B22F10/34B22F10/36B22F10/366B22F10/38B22F10/32Y02P10/25
Inventor 陈岁元王瑞雪刘常升郭快快梁京
Owner NORTHEASTERN UNIV
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