Thermal treatment method for improving product of strength and elongation of laser melting deposition 12CrNi2 alloy steel
A technology of laser melting deposition and heat treatment, which is applied in the direction of improving energy efficiency, process efficiency, and additive processing, can solve the problems of poor comprehensive mechanical properties of 12CrNi2 alloy steel components, and achieve effective grain size refinement, strong The effect of increasing plastic volume
Active Publication Date: 2021-05-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0004] In order to solve the problem of poor comprehensive mechanical properties of laser melting deposited 12CrNi2 alloy steel components, the purpose of the present invention is to provide a heat treatment method for improving the strength and plasticity of laser melting deposited 12CrNi2 alloy steel, and control the alloy steel through composite dual-phase zone temperature quenching treatment Microstructure, realizing the improvement of strength and toughness of laser melting deposited 12CrNi2 alloy steel
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Embodiment 1
[0024] In the present embodiment, the heat treatment method for improving the strength-plastic product of laser melting deposited 12CrNi alloy steel is as follows:
[0025] 1. Laser melting deposition 12CrNi2 alloy steel is prepared by laser melting deposition technology characterized by synchronous powder feeding, and the laser used is a semiconductor laser.
[0026] 2. If figure 1 As shown, the microstructure morphology shows that, by volume percentage, the laser melting deposited 12CrNi2 alloy steel microstructure consists of a brown ferrite matrix (93%) and a small amount of bright white austenite islands (7%).
[0027] 3. If figure 2 As shown, the stress-strain curve shows that the tensile strength of the laser melting deposited 12CrNi2 alloy steel is 683.6MPa, the elongation is 22.57%, and the strong-plastic product is 15.43GPa·%.
[0028] 4. The quenching treatment steps in the composite dual-phase zone are as follows: the laser melting deposited 12CrNi2 alloy steel ...
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Abstract
The invention belongs to the field of metal laser additive manufacturing and in particular to a thermal treatment method for improving product of strength and elongation of laser melting deposition 12CrNi2 alloy steel. The method is suitable for improving comprehensive mechanical properties of a laser additive manufacturing alloy steel member with a complex structure, for example, strength and toughness. The method is compound double phase area (ferrite- austenite areas) temperature quenching treatment. The method specifically comprises the following steps: heating the laser melting deposition 12CrNi2 alloy steel to 860 DEG C at a heating temperature of 50 DEG C / min, preserving the temperature for 30 min, and then placing the steel in water to quench; heating the quenched alloy steel to 200-300 DEG C at a heating temperature of 50 DEG C / min for tempering treatment, preserving temperature for 30-180 min and cooling the steel in air to room temperature; and continuously heating the temperate alloy steel to 760-810 DEG C at the heating temperature of 50 DEG C / min, preserving the temperature for 20-60 min and placing the steel in water to be cooled to room temperature. The method can regulate phase composition and grain dimension of the laser melting deposition 12CrNi2 alloy steel effectively and improve the product of strength and elongation of laser melting deposition alloy steel.
Description
technical field [0001] The invention belongs to the field of metal laser additive manufacturing, and specifically relates to a heat treatment method for improving the strength and plasticity of laser melting deposited 12CrNi2 alloy steel, which is suitable for improving the comprehensive mechanical properties of laser additive manufacturing alloy steel components of various complex structures with similar components. . Background technique [0002] 12CrNi2 alloy steel is a low-carbon low-alloy steel. This type of steel is a commonly used metal structure material at this stage, and is widely used in large-scale high-performance machine parts in industry. For example, the diesel engine camshaft used in nuclear power has a complex shape and structure. The prerequisite for safe use is that the alloy steel microstructure is uniform and dense, the performance of each part is coordinated, the surface is high-strength and hard, and the core is high-toughness. Nowadays, the producti...
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IPC IPC(8): C21D1/18B33Y40/20
CPCC21D1/18B33Y40/00C21D2211/005C21D2211/008Y02P10/25
Inventor 董志宏张炜亢红伟杨晨迟长泰谢玉江彭晓
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI