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Method for producing medium manganese steel through cyclic quenching and I-Q&P treatment and application of method

A technology of I-Q&P and manganese steel, applied in the field of advanced high-strength steel preparation, can solve the problems of low impact energy absorption capacity, deformation or fracture of structural parts, intrusion, etc., and achieve austenite stability improvement, strength and plasticity Elevation, the effect of increasing the manganese content

Pending Publication Date: 2021-02-19
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] With the development of the automobile industry, traffic accidents are also increasing. When a car collides, the important structural parts will bear most of the impact force. If the strength and elongation after breaking are not high enough, it is easy to cause serious deformation or fracture of the structural parts. The absorption capacity will become lower, the living space of passengers will become very small, and even external objects will directly invade the passenger compartment, seriously threatening the safety of the occupants. This requires high-efficiency energy absorption, high strength, and high elongation. Parts

Method used

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  • Method for producing medium manganese steel through cyclic quenching and I-Q&P treatment and application of method
  • Method for producing medium manganese steel through cyclic quenching and I-Q&P treatment and application of method
  • Method for producing medium manganese steel through cyclic quenching and I-Q&P treatment and application of method

Examples

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Effect test

no. 1 example

[0041] A method for circulating quenching+I-Q&P processing to produce medium manganese steel, comprising the steps:

[0042] (1) Select a medium manganese steel plate with a thickness of 2.7mm as the original steel plate, and its composition is C: 0.08%, Mn: 4.96%, Cu: 0.53%, Mo: 0.18%, Cr: 0.35%, Nb: 0.10 %, P: 0.005%, S: 0.006%, and the balance is Fe and unavoidable impurities. The austenite transformation end temperature (AC 3 -1), which is 740°C.

[0043] (2) Heat the original steel plate to 780°C for 5 minutes, and then water quench to room temperature; heat again to 780°C for 5 minutes, then water quench to room temperature; heat for the third time to 780°C, hold for 5 minutes, and water quench to At room temperature, a circulating quenched steel plate was obtained.

[0044] (3) The austenite transformation initiation temperature (AC 1 -2), austenite transformation end temperature (AC 3 -2), martensite transformation start temperature (Ms-2), martensite transformati...

no. 2 example

[0055] A method for circulating quenching+I-Q&P processing to produce medium manganese steel, comprising the steps:

[0056] (1) Select a medium manganese steel plate with a thickness of 2.7mm as the original steel plate, and its composition is C: 0.08%, Mn: 4.96%, Cu: 0.53%, Mo: 0.18%, Cr: 0.35%, Nb: 0.10 %, P: 0.005%, S: 0.006%, and the balance is Fe and unavoidable impurities. The austenite transformation end temperature (AC 3 -1), which is 740°C.

[0057] (2) Heat the original steel plate to 780°C for 5 minutes, and then water quench to room temperature; heat again to 780°C for 5 minutes, then water quench to room temperature; heat for the third time to 780°C, hold for 5 minutes, and water quench to At room temperature, a circulating quenched steel plate was obtained.

[0058] (3) The austenite transformation initiation temperature (AC 1 -2), austenite transformation end temperature (AC 3 -2), martensite transformation start temperature (Ms-2), martensite transformati...

no. 3 example

[0069] A method for circulating quenching+I-Q&P processing to produce medium manganese steel, comprising the steps:

[0070] (1) Select a medium manganese steel plate with a thickness of 3.0mm as the original steel plate, and its composition is C: 0.10%, Mn: 5.00%, Cu: 0.50%, Mo: 0.20%, Cr: 0.39%, Nb: 0.08 %, P: 0.003%, S: 0.004%, and the balance is Fe and unavoidable impurities. The austenite transformation end temperature (AC 3 -1), which is 738°C.

[0071] (2) Heat the original steel plate to 760°C for 5 minutes, and then water quench to room temperature; heat again to 780°C for 5 minutes, then water quench to room temperature; heat for the third time to 780°C, hold for 5 minutes, and water quench to At room temperature, a circulating quenched steel plate was obtained.

[0072] (3) The austenite transformation initiation temperature (AC 1 -2), austenite transformation end temperature (AC 3 -2), martensite transformation start temperature (Ms-2), martensite transformati...

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Abstract

The invention relates to the technical field of advanced high-strength steel preparation, in particular to a method for producing medium manganese steel through cyclic quenching and I-Q&P treatment and application of the method. The method comprises the following steps that (1) a cyclic quenching process is conducted, specifically, steel is heated to be higher than an AC3-1 temperature, the temperature is kept, water quenching is conducted to room temperature, and the steel is treated twice or more according to the process to obtain cyclic quenched steel; (2) critical zone treatment is conducted, specifically, the cyclic quenched steel is heated to be between the AC1-2 temperature and the AC3-2 temperature of the cyclic quenched steel, and then the temperature is kept; and (3) quenching-partitioning treatment is conducted, specifically, the steel obtained in the step (2) is quenched to be between the Ms-2 temperature and the Mf-2 temperature, the temperature is kept, finally, waterquenching is conducted to the room temperature, and the steel is obtained. The mechanical property of the steel obtained through the process is remarkably higher than that of a hot rolled plate, thesteel has good cold and hot machining properties, and compared with a direct critical annealing treatment process, the process time is short, and the properties of the steel are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of advanced high-strength steel preparation, in particular to a method for producing medium manganese steel by cyclic quenching + I-Q&P treatment and its application. Background technique [0002] The following content in the background technology only refers to the information related to the present invention understood by the inventor, and aims to increase the understanding of the present invention by explaining some basic technical knowledge related to the present invention. Knowledge known to those of ordinary skill in the art. [0003] In 2003, based on the traditional martensite and bainite phase transformation theory, Speer et al. proposed the Q&P process to produce high-strength plasticity Q&P steel with TRIP effect. Typical Q&P steel production is to heat the steel plate above the Ac3 temperature to complete austenitization, and then rapidly cool it to the temperature between Ms and Mf for carbon p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/78C21D1/18C21D6/00C22C38/22C22C38/26C22C38/38
CPCC21D1/18C21D1/785C21D6/002C21D6/005C21D2211/001C21D2211/005C21D2211/008C22C38/22C22C38/26C22C38/38
Inventor 景财年刘磊林涛赵顺治张志浩吴聪李兆通冯燕吴忠林叶道珉雷启腾赵静蕊孙海波范小磊
Owner SHANDONG JIANZHU UNIV
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