Post heat treatment method for laser additive manufacturing 12CrNi2 alloy steel
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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, fine structure and grain size Effect
Inactive Publication Date: 2019-06-14
HARBIN INST OF TECH
View PDF3 Cites 5 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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 :
[0052] 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
[0053] 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.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention provides a post heat treatment method for a laser additive manufacturing 12CrNi2 alloy steel and relates to the technical field of post heat treatment of the additive manufacturing alloysteel. The purpose of the invention is to solve the problems that traditional laser additive manufacturing is uneven in tissue, difficult to remove residual stresses and low in alloy strength. The method comprises the steps of 1, heating and temperature raising, specifically, the laser additive manufacturing 12CrNi2 alloy steel is heated to 856-866 DEG C; 2, heat preservation, specifically, heatpreservation treatment is performed on the 12CrNi2 alloy steel after the heating and temperature raising under the condition of 856-866 DEG C; 3, cooling, specifically, the 12CrNi2 alloy steel after the heat preservation is water-cooled to the room temperature; and 4, the cooled 12CrNi2 alloy steel is heated to 734-836 DEG C and the heat preservation treatment is performed under this temperature condition, then water-cooling is performed to the room temperature, and the treated 12CrNi2 alloy steel is obtained. By means of the post heat treatment method for the laser additive manufacturing 12CrNi2 alloy steel, the post heat treatment method for the laser additive manufacturing 12CrNi2 alloy steel can be obtained.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more