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A post-heat treatment method for laser additive manufacturing of 12crni2 alloy steel

A laser additive and post-heat treatment technology, applied in the direction of process efficiency improvement, energy efficiency improvement, etc., can solve the problems of low alloy strength, uneven structure, difficult to eliminate residual stress, etc., and achieve high strength and fine grain size. Effect

Inactive Publication Date: 2021-03-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of non-uniform structure, difficult elimination of residual stress and low alloy strength in traditional laser additive manufacturing, and to provide a post-heat treatment method for laser additive manufacturing of 12CrNi2 alloy steel

Method used

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  • A post-heat treatment method for laser additive manufacturing of 12crni2 alloy steel
  • A post-heat treatment method for laser additive manufacturing of 12crni2 alloy steel
  • A post-heat treatment method for laser additive manufacturing of 12crni2 alloy steel

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specific Embodiment approach 1

[0038] Specific embodiment one: This embodiment is a post-heat treatment method for laser additive manufacturing of 12CrNi2 alloy steel, which is specifically completed according to the following steps:

[0039] 1. Heating and heating: use cladding deposition materials to manufacture 12CrNi2 alloy steel, and then heat the 12CrNi2 alloy steel to 856 ° C ~ 866 ° C;

[0040] 2. Heat preservation: heat-preserve the heated 12CrNi2 alloy steel at 856°C to 866°C;

[0041] 3. Cooling: Cool the 12CrNi2 alloy steel after heat preservation to room temperature;

[0042] 4. Sub-temperature quenching: heating the cooled 12CrNi2 alloy steel to 734°C to 836°C and performing heat preservation treatment under this temperature condition, and then water cooling to room temperature to obtain the treated 12CrNi2 alloy steel.

[0043] The principle of this implementation mode:

[0044] The post-heat treatment method for 12CrNi2 alloy steel manufactured by laser additive manufacturing is: quenching...

specific Embodiment approach 2

[0051] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the cladding deposition material described in step one is 12CrNi2 powder, and the chemical composition of 12CrNi2 powder is C: 0.08%~0.19%, Cr : 0.7%~1%, Ni: 1.4%~2.1%, Mn: 0.2%~0.7%, Si: 0.14%~0.39%, the balance is Fe, and the oxygen concentration in 12CrNi2 powder is 260ppm~290ppm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the 12CrNi2 alloy steel manufactured by cladding deposition materials in step 1 is manufactured by laser additive manufacturing. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a post-heat treatment method for laser additive manufacturing of 12CrNi2 alloy steel, and relates to the technical field of post-heat treatment for additive manufacturing of alloy steel. The purpose of the invention is to solve the problems of non-uniform structure, difficult elimination of residual stress and low alloy strength in traditional laser additive manufacturing. Method: 1. Heating and heating: heating the 12CrNi2 alloy steel manufactured by laser additive to 856°C-866°C; 2. Heat preservation: heat-preserve the heated 12CrNi2 alloy steel at 856°C-866°C; 3. Cooling: Cool the 12CrNi2 alloy steel after heat preservation to room temperature; 4. Heat the cooled 12CrNi2 alloy steel to 734 ° C ~ 836 ° C and perform heat preservation treatment under this temperature condition, and then water cool to room temperature to obtain the treated 12CrNi2 alloy steel. The invention can obtain a post-heat treatment method for laser additive manufacturing of 12CrNi2 alloy steel.

Description

technical field [0001] The invention relates to the technical field of post-heat treatment of additively manufactured alloy steel. Background technique [0002] The nuclear power emergency diesel engine is the key equipment for the nuclear power system to ensure the smooth shutdown of the power plant in the event of an accident. As the core metal component for power transmission of nuclear power equipment, the shaft of traditional nuclear power emergency diesel engine is forged from 12CrNi2 alloy steel. Due to the problems of long cycle, high material requirements and complex manufacturing process in the traditional manufacturing process, and its harsh service conditions, higher requirements are put forward for its structural design, materials and manufacturing. The traditional manufacturing process is a typical subtractive manufacturing process based on forging technology, which has problems such as cumbersome process, low material utilization rate and low yield. In view ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00B22F3/105B22F3/24
CPCY02P10/25
Inventor 李福泉章碧成孟祥旭李明伟
Owner HARBIN INST OF TECH
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