ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2024, Vol. 45 ›› Issue (5): 108-112.DOI: 10.20057/j.1003-8620.2023-00204

• 形变与相变 • 上一篇    下一篇

淬火温度对M6C强化2 200 MPa级超高强度钢力学性能的影响

唐远寿1,2, 张十庆1,2, 李方1,2, 何钦生1,2, 赵振1,2,王宏1,2,邹兴政1,2, 王建桥1,2, 黄雅丽1,2   

  1. 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;
  • 收稿日期:2024-01-25 出版日期:2024-09-30 发布日期:2024-10-01
  • 通讯作者: 张十庆
  • 作者简介:唐远寿(1995—),男,硕士; E-mail:1764086604@qq.com
  • 基金资助:
    重庆英才-创新领军人才 (CQYC20210301302)

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

Tang Yuanshou1,2, Zhang Shiqing1,2, Li Fang1,2, He Qinsheng1,2, Zhao Zhen1,2,Wang Hong1,2,  Zou Xingzheng1,2, Wang Jianqiao1,2, Huang Yali1,2   

  1. 1 Chongqing Materials Research Institute Co., Ltd., Chongqing 400700, China;
    2 Chongqing Institute of Instrument Materials, Chongqing 400700, China;
  • Received:2024-01-25 Published:2024-09-30 Online:2024-10-01
  • Contact: Zhang Shiqing

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M6C碳化物在不同淬火温度(860~1150 ℃)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M6C颗粒尺寸、数量及成分的演变进行了研究。结果表明,大尺寸M6C颗粒使超高强度钢韧性降低,880 ℃淬火试样中的M6C颗粒尺寸较大(~400 nm),容易在大尺寸M6C周围造成应力集中,减弱了基体与M6C碳化物的结合力,易在M6C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M6C颗粒尺寸减小、数量降低,且提升了M6C颗粒中Si的浓度,M(Fe、Mo、Ni、Co)6C中原子被Si取代,提升了M6C碳化物的稳定性;1050 ℃ 淬火温度试验钢中M6C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2227 MPa,伸长率为7.0%,实现良好的强韧性匹配。

关键词: 40CrNi2Si2MoV马氏体钢, M6C, 淬火温度, 力学性能, 晶粒尺寸

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 M6C carbide on mechanical properties and microstructure of ultrahigh strength steel were studied at different quenching temperatures (860 ℃-1150 ℃), and the evolution of M6C particle size, quantity and composition was studied by means of SEM and TEM. The results show that large M6C particles reduce 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 M6C carbide , weaken the binding force between the matrix and M6C carbide, and easy to crack around M6C carbide, resulting in material fracture.With the increase of quenching temperature, the size and quantity of M6C particles in the test steel decrease, and the concentration of Si in M6C particles is increased, and the atoms in M(Fe, Mo, Ni, Co)6C are replaced by Si, which improves the stability of M6C carbide. The size of M6C particle in the 1050 ℃ 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 2227 MPa and the elongation is 7.0%, achieving a good strength and toughness matching.

Key words:  , 40CrNi2Si2MoV Martensitic Steel; M6C; Quenching Temperature; Mechanical Properties; Grain Size

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