Effect of Quenching Temperature on Mechanical Properties of M<sub>6</sub>C Reinforced 2 200 MPa Ultra-high Strength Steel

Tang Yuanshou; Zhang Shiqing; Li Fang; He Qinsheng; Zhao Zhen; Wang Hong; Zou Xingzheng; Wang Jianqiao; Huang Yali

doi:10.20057/j.1003-8620.2023-00204

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Effect of Quenching Temperature on Mechanical Properties of M₆C Reinforced 2 200 MPa Ultra-high Strength Steel

Forming and Phase Transition | 更新时间：2025-05-09

- Effect of Quenching Temperature on Mechanical Properties of M₆C Reinforced 2 200 MPa Ultra-high Strength Steel
- Special Steel Vol. 45, Issue 5, Pages: 108-112(2024)
- 作者机构：
  
  1.重庆材料研究院有限公司，重庆 400700
  2.重庆仪表材料研究所，重庆 400700
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2023-00204
  CLC： TG132.2
- Received：26 September 2023，
  
  Published：30 September 2024
- 稿件说明：
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唐远寿,张十庆,李方等.淬火温度对M₆C强化2 200 MPa级超高强度钢力学性能的影响[J].特殊钢,2024,45(05):108-112.

Tang Yuanshou,Zhang Shiqing,Li Fang,et al.Effect of Quenching Temperature on Mechanical Properties of M₆C Reinforced 2 200 MPa Ultra-high Strength Steel[J].Special Steel,2024,45(05):108-112.
唐远寿,张十庆,李方等.淬火温度对M₆C强化2 200 MPa级超高强度钢力学性能的影响[J].特殊钢,2024,45(05):108-112. DOI： 10.20057/j.1003-8620.2023-00204.

Tang Yuanshou,Zhang Shiqing,Li Fang,et al.Effect of Quenching Temperature on Mechanical Properties of M₆C Reinforced 2 200 MPa Ultra-high Strength Steel[J].Special Steel,2024,45(05):108-112. DOI： 10.20057/j.1003-8620.2023-00204.

摘要

40CrNi2Si2MoV马氏体钢中大尺寸碳化物存在会影响其力学性能，通过成分设计优化和合理的热处理工艺可以有效提高材料的强韧性。研究了M

C碳化物在不同淬火温度（860~1 150 ℃）下对超高强度钢力学性能及显微组织的影响，并通过SEM、TEM等表征方法对M

C颗粒尺寸、数量及成分的演变进行了研究。结果表明，大尺寸M

C颗粒使超高强度钢韧性降低，880 ℃淬火试样中的M

C颗粒尺寸较大（~400 nm），容易在大尺寸M

C周围造成应力集中，减弱了基体与M

C碳化物的结合力，易在M

C碳化物周围萌生裂纹，致使材料发生断裂。随着淬火温度升高，试验钢中M

C颗粒尺寸减小、数量降低，且提升了M

C颗粒中Si的浓度，M（Fe、Mo、Ni、Co）

C中原子被Si取代，提升了M

C碳化物的稳定性；1 050 ℃ 淬火温度试验钢中M

C颗粒尺寸为25 nm，同时抑制原始奥氏体晶粒（8.5 μm）长大，试验钢抗拉强度为2 227 MPa，伸长率为7.0%，实现良好的强韧性匹配。

Abstract

The mechanical properties of 40CrNi2Si2MoV martensitic steel are affected by the large size carbides，the strength and toughness of martensitic steel can be effectively improved by optimizing the composition design and reasonable heat treatment process. The effects of M

C carbide on mechanical properties and microstructure of ultrahigh strength steel were studied at different quenching temperatures （860 ℃-1 150 ℃）， and the evolution of M

C particle size， quantity and composition was studied by means of SEM and TEM. The results show that large M

C particles redu

ce the toughness of ultrahigh strength steel， and the M6C particles in the 880 ℃ quenching sample are large （~400 nm）， which is easy to cause stress concentration around the large M

C carbide ， weaken the binding force between the matrix and M

C carbide， and easy to crack around M6C carbide， resulting in material fracture.With the increase of quenching temperature， the size and quantity of M

C particles in the test steel decrease， and the concentration of Si in M

C particles is increased， and the atoms in M（Fe， Mo， Ni， Co）

C are replaced by Si， which improves the stability of M

C carbide. The size of M

C particle in the 1 050 ℃ quenching temperature test steel is 25 nm， and the growth of the original austenite grain （8.5 μm） is inhibited. The strength of the test steel is 2 227 MPa and the elongation is 7.0%， achieving a good strength and toughness matching.

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references

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Effect of Quenching Temperature on Mechanical Properties of M6C Reinforced 2 200 MPa Ultra-high Strength Steel

DOI：10.20057/j.1003-8620.2023-00204

摘要

Abstract

关键词

Keywords

references

Effect of Quenching Temperature on Mechanical Properties of M₆C Reinforced 2 200 MPa Ultra-high Strength Steel