A comprehensive partition heat treatment method of c and mn in low carbon c-mn-si steel with trip effect

A heat treatment method, c-mn-si technology, applied in Mn comprehensive distribution heat treatment, low-carbon C-Mn-Si series steel C, low-carbon steel heat treatment field, can solve the problem of reducing austenite stability, reducing horse It can improve the stability, lower the heating temperature and lower the austenitization temperature, etc.

Active Publication Date: 2020-03-31
SHANDONG JIANZHU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, low carbon content will affect the distribution process of carbon in the traditional Q&P process, reducing the stability of austenite; resulting in low carbon content in martensite, reducing the strength of martensite
The low-carbon C-Mn-Si series steel after heat treatment has lower strength and plasticity
Moreover, the existing Q&P heat treatment process takes a long time, and the matching of parameters still needs to be further explored

Method used

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  • A comprehensive partition heat treatment method of c and mn in low carbon c-mn-si steel with trip effect
  • A comprehensive partition heat treatment method of c and mn in low carbon c-mn-si steel with trip effect
  • A comprehensive partition heat treatment method of c and mn in low carbon c-mn-si steel with trip effect

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Clean the cold-rolled steel plate with the composition of 0.12C-1.5Mn-1.1Si, remove rust and oil, and then air-dry to make the surface smooth. To avoid uneven heating during heat treatment.

[0026] (1) The first Mn distribution: the pretreated low-carbon C-Mn-Si steel was heated to 820°C in the two-phase region and kept for 5 minutes.

[0027] (2) Complete austenitization: heat to 920°C in the austenite zone and keep it warm for 3 minutes to make it completely austenitized.

[0028] (3) The second Mn distribution: lower the temperature of the test steel to 870°C, keep it warm for 5 minutes, and perform the second Mn distribution.

[0029] (4) Carbon partitioning: Quenching to 260°C quickly after the heat preservation is over, controlling the partitioning time to 20s, and finally water quenching to room temperature.

[0030] figure 2 SEM image of low carbon C-Mn-Si steel obtained by heat treatment process. The microstructure is mainly composed of martensite, ferrit...

Embodiment 2

[0033] Clean the cold-rolled steel plate with the composition of 0.12C-1.5Mn-1.1Si, remove rust and oil, and then air-dry to make the surface smooth. To avoid uneven heating during heat treatment.

[0034] (1) The first Mn distribution: the pretreated low-carbon C-Mn-Si steel was heated to 820°C in the two-phase region and kept for 7 minutes.

[0035] (2) Complete austenitization: heat to 920°C in the austenite zone and keep it warm for 3 minutes to make it completely austenitized.

[0036] (3) The second Mn distribution: lower the temperature of the test steel to 870°C, keep it warm for 7 minutes, and carry out the second Mn distribution.

[0037] (4) Carbon partitioning: Quenching to 240°C quickly after the heat preservation is over, controlling the partitioning time to 30s, and finally water quenching to room temperature.

[0038] According to backscattered and electron probe images, the raised part is martensite, and the depressed part is ferrite. Martensite is transfor...

Embodiment 3

[0041] Clean the cold-rolled steel plate with the composition of 0.12C-1.5Mn-1.1Si, remove rust and oil, and then air-dry to make the surface smooth. To avoid uneven heating during heat treatment.

[0042] (1) The first Mn distribution: the pretreated low-carbon C-Mn-Si steel was heated to 820°C in the two-phase region and kept for 7 minutes.

[0043] (2) Complete austenitization: heat to 920°C in the austenite zone and keep it warm for 3 minutes to make it completely austenitized.

[0044] (3) The second Mn distribution: lower the temperature of the test steel to 870°C, keep it warm for 5 minutes, and perform the second Mn distribution.

[0045] (4) Carbon partitioning: Quenching to 260°C quickly after the heat preservation is over, controlling the partitioning time to 20s, and finally water quenching to room temperature.

[0046] After testing, its tensile strength is 940MPa, its elongation after fracture is 15.6%, and its strong-plastic product reaches 14700MPa·%.

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Abstract

The invention provides a C-Mn comprehensive partitioning heat treatment method for C-Mn-Si steel with the TRIP effect. The C-Mn comprehensive partitioning heat treatment method for the C-Mn-Si steel with the TRIP effect comprises the steps that firstly, heat-preservation is conducted on a pretreated low-carbon C-Mn-Si cold-rolled steel plate at the temperature of 820 DEG C for 5-10 min; then the low-carbon C-Mn-Si cold-rolled steel plate is heated to the temperature of 920 DEG C and maintained at the temperature for 3 min; afterwards, the temperature of tested steel is decreased to 870 DEG C, and heat preservation is conducted for 3-7 min; then the steel is quenched to the temperature of 240-260 DEG C, and heat preservation is conducted for 10-30 s; and finally, the steel is quenched to the indoor temperature with water. The C-Mn comprehensive partitioning heat treatment method is particularly suitable for the low-carbon C-Mn-Si steel with the carbon content being 0.1-0.15 wt%, a high-strength steel plate with the strength and ductility product being 14000-15000 Mpa.%, the the ductility being 15%-16% and good weldability can be obtained, and the microstructure of the steel plate is martensite, ferrite and retained austenite. Meanwhile, in the mode of high-temperature secondary Mn partitioning and low-temperature carbon partitioning, the stability of the austenite and the content of the retained austenite in Q&P steel are improved, and the performance of the Q&P steel is further improved. By adoption of the C-Mn comprehensive partitioning heat treatment method, the austenitizing temperature is low, the heating temperature can be decreased, and the heating time can be shortened. Meanwhile, the time for the whole heat treatment process is short, the production efficiency can be greatly improved, the production cost is reduced, and the method has good application prospects in the automobile industry.

Description

technical field [0001] The invention relates to a heat treatment method for low-carbon steel, in particular to a C and Mn comprehensive distribution heat treatment method for low-carbon C-Mn-Si steel with TRIP effect, and belongs to the technical field of material heat treatment. Background technique [0002] The lightweight of the car refers to a technology to reduce the weight of the car itself through the optimization of the car body structure and the extensive application of lightweight materials under the premise of ensuring the safety performance of the car. The lightweight technology of automobiles has great potential in alleviating energy and environmental crises. A large number of body parts made of advanced high-strength steel are used in the body-in-white of the car, which can effectively reduce the weight of the car itself, improve fuel efficiency, and reduce exhaust emissions while ensuring the safety of the car. Automobile lightweight has become one of the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/18
CPCC21D1/18C21D6/005C21D6/008C21D2211/001C21D2211/005C21D2211/008
Inventor 景财年邢兆贺涂英明吕明桦
Owner SHANDONG JIANZHU UNIV
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