| 引用本文: | 杨赛玄,董治中,杨晓斌,孙伟,张慧星,潘慧,董纪.1 T磁场下不同回火时间对25CrMo48V钢碳化物及力学性能的影响[J].材料科学与工艺,2025,33(4):51-62.DOI:10.11951/j.issn.1005-0299.20240001. |
| YANG Saixuan,DONG Zhizhong,YANG Xiaobin,SUN Wei,ZHANG Huixing,PAN Hui,DONG Ji.Effects of different tempering times under 1 T magnetic field on carbides and mechanical properties of 25CrMo48V steel[J].Materials Science and Technology,2025,33(4):51-62.DOI:10.11951/j.issn.1005-0299.20240001. |
|
| |
|
|
| 本文已被：浏览 15次 下载 6次 |
![本文二维码信息]()
码上扫一扫！ |
|
|
| 1 T磁场下不同回火时间对25CrMo48V钢碳化物及力学性能的影响 |
|
杨赛玄1,2, 董治中1, 杨晓斌1, 孙伟2, 张慧星2, 潘慧3, 董纪2
|
|
(1.天津理工大学 材料科学与工程学院,天津 300385; 2.天津中德应用技术大学 机械工程学院,天津 300350; 3.航天精工股份有限公司,天津 300300)
|
|
| 摘要: |
| 为了探究1 T磁场作用下600 ℃时不同回火时间对25CrMo48V超高强度钢碳化物演变及力学性能的影响,本文将25CrMo48V实验用钢1 000 ℃奥氏体化30 min后置于强磁场高温箱式炉中进行回火热处理,保温温度为600 ℃,保温时间分别为0、10、30、60、180、240 min,并利用光学显微镜、扫描电子显微镜和透射电子显微镜对磁场热处理后的试样进行显微组织观察,采用维氏硬度计和电子万能试验机测试其力学性能。研究表明,未回火试样析出M3C和两种MC型碳化物,回火后试样主要有M3C、M2C、M7C3、M23C6型4种碳化物析出,其演变规律为:M3C→M2C→M7C3→M23C6。回火30 min时基体中M3C几乎消失,并有M2C、M7C3、M23C6析出。长时间的回火工艺会使部分M3C型碳化物转变为更稳定的M23C6型碳化物,其余M3C会重新溶解于回火马氏体基体中。短棒状M2C型碳化物呈链状排列,部分连成长线状M7C3型碳化物。回火过程中析出具有二次硬化作用的Mo2C,使得试样硬度值升高。回火时间过长,则M7C3和M23C6碳化物尺寸粗化,基体内部碳含量降低,硬度值下降。 |
| 关键词: 磁场热处理 25CrMo48V 超高强度钢 碳化物演变 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20240001 |
| 分类号:TG156.97 |
| 文献标识码:A |
| 基金项目:天津市教委科研计划项目(2020KJ084). |
|
| Effects of different tempering times under 1 T magnetic field on carbides and mechanical properties of 25CrMo48V steel |
|
YANG Saixuan1,2,DONG Zhizhong1,YANG Xiaobin1,SUN Wei2,ZHANG Huixing2,PAN Hui3,DONG Ji2
|
|
(1.School of Materials Science Engineering, Tianjin University of Technology, Tianjin 300385, China; 2.School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China; 3.Aerospace Precision Products Inc., Ltd., Tianjin 300300, China)
|
| Abstract: |
| In order to investigate the effects of different tempering time at 600 ℃ under 1T magnetic field on carbide evolution and mechanical properties of 25CrMo48V ultra-high strength steel, this study subjected the 25CrMo48V steel to austenitization at 1 000 ℃ for 30 min, followed by tempering in a high-temperature box furnace under a strong magnetic field at 600 ℃. The tempering times were set at 0, 10, 30, 60, 180 and 240 min. All test steels after magnetic field heat treatment were observed for microstructure using optical microscope, scanning electron microscope and transmission electron microscope.Mechanical properties were tested using a Vickers hardness meter and electron universal testing machine. The study indicates that the as-quenched samples exhibit the precipitation of M3C and two types of MC carbides. After tempering, four types of carbides M3C, M2C, M7C3 and M23C6 mainly precipitated from the sample, and the evolution law of these four carbides was as follows: M3C→M2C→M7C3→M23C6. After tempering for 30 min, M3C almost completely disappeared in the sample matrix, and M2C, M7C3 and M23C6 precipitated. Prolonged tempering processes cause some M3C carbides to transform into more stable M23C6 carbides, while the remaining M3C may re-dissolve into the tempered martensite matrix. The short, rod-like M2C carbides are arranged in a chain-like formation, with some connecting to form elongated M7C3 carbides. Due to the precipitation of Mo2C with secondary hardening during the tempering process, the hardness value of the sample increases. However, excessive tempering time leads to coarsening of M7C3 and M23C6 carbides, a reduction in carbon content in the matrix, and a subsequent decrease in hardness. |
| Key words: magnetic field heat treatment 25CrMo48V ultra-high strength steels carbide evolution mechanical property |
|
|
|
|
