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A method for improving the performance of traditional q&p steel through carbon-manganese comprehensive distribution
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A carbon distribution, traditional technology, applied in the field of improving the performance of traditional Q&P steel, can solve problems such as the decrease in the strength of the material matrix, and achieve the effects of reducing weight, improving stability and reducing production costs
Active Publication Date: 2020-10-09
SHANDONG JIANZHU UNIV
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Problems solved by technology
[0003] At present, the performance index of the third-generation advanced high-strength steel is under design, and its goal is to have both ultra-high strength and good plasticity. However, on the issue of how to obtain retained austenite to the greatest extent by controlling the process and how to compensate for the decrease in the volume fraction of martensite due to the increase in the volume fraction of retained austenite, the researchers We don't have a good solution yet
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Embodiment 1
[0021] The material used in actual production is 0.11C-1.50Mn-1.16Si, and its process includes the following steps:
[0022] (1) The first manganese distribution: first heat the material at a heating rate of 10°C / min to Ac 3 and A C1 (two-phase region) at 820°C and hold for 8 minutes.
[0023] (2) Austenitization: quickly heat the material to 940°C and keep it warm for 3 minutes.
[0024] (3) The second manganese distribution: lower the temperature to 870°C and keep it warm for 3 minutes.
[0025] (4) Carbon partitioning: quickly transfer the material to 240°C, hold it for 10s, and perform salt bath quenching.
[0026] (5) Quenching: quench the material to room temperature.
Embodiment 2
[0028] The material used in actual production is 0.11C-1.50Mn-1.16Si, and its process includes the following steps:
[0029] (1) The first manganese distribution: first heat the material at a heating rate of 10°C / min to Ac 3 and A C1 (two-phase region) at 820°C and hold for 8 minutes.
[0030] (2) Austenitization: quickly heat the material to 940°C and keep it warm for 3 minutes.
[0031] (3) The second manganese distribution: lower the temperature to 870°C and keep it warm for 5 minutes.
[0032] (4) Carbon partitioning: quickly transfer the material to 240°C, hold it for 15s, and perform salt bath quenching.
[0033] (5) Quenching: quench the material to room temperature.
Embodiment 3
[0035] The material used in actual production is 0.11C-1.50Mn-1.16Si, and its process includes the following steps:
[0036] (1) The first manganese distribution: first heat the material at a heating rate of 10°C / min to Ac 3 and A C1 (two-phase region) at 820°C and hold for 8 minutes.
[0037] (2) Austenitization: quickly heat the material to 940°C and keep it warm for 3 minutes.
[0038] (3) The second manganese distribution: lower the temperature to 870°C and keep it warm for 8 minutes.
[0039] (4) Carbon partitioning: quickly transfer the material to 240°C, hold it for 20s, and perform salt bath quenching.
[0040] (5) Quenching: quench the material to room temperature.
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Abstract
The invention relates to a method for improving performance of conventional Q&P steel by carbon-manganese comprehensive partition. The method comprises the following steps of: heating a material to certain temperature between AC3 and AC1 (two phase regions) with a certain rate and keeping the temperature for certain time, and quickly heating the material to a temperature higher than AC3 and keeping the temperature for certain time; reducing the temperature to a certain temperature which is between AC3 and AC1 (two phase regions) and is higher than a first manganese partition temperature, and keeping the temperature for certain time, quickly transferring the material to certain temperature between MS and Mf to perform quenching and heat-preserving for certain time; and finally, performing water-quenching on the material until the room temperature. The method adopts a carbon-manganese comprehensive partition process for improving stability of residual austenite though an element carbon and an element manganese, improves the structure and the mechanical properties of the conventional Q&P steel through the comprehensive effect of the element carbon and the element manganese very well; the improved Q&P steel is applied to a car, so that weight of the car body can be reduced, and therefore, the safety is improved; besides, the method further reduces production cost, achieves energy conservation and emission reduction and is wide in application prospect.
Description
technical field [0001] The invention relates to a method for improving the performance of traditional Q&P steel, in particular to a method for improving the performance of traditional Q&P steel through carbon-manganese comprehensive distribution. Background technique [0002] With the advancement of science and technology and the development of the economy, due to the continuous improvement of the requirements for energy saving, environmental protection and safety of automobiles, reducing the weight of the car body and improving the crash performance are two important goals of the automobile industry today. [0003] At present, the performance index of the third-generation advanced high-strength steel is under design, and its goal is to have both ultra-high strength and good plasticity. However, on the issue of how to obtain retained austenite to the greatest extent by controlling the process and how to compensate for the decrease in the volume fraction of martensite due to ...
Claims
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Application Information
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