Cu对9Ni钢强度和低温韧性的影响

材料研究学报

2012, Vol. 26

Issue (3): 315-320

研究论文

本期目录 | 过刊浏览

Cu对9Ni钢强度和低温韧性的影响

欧阳凰生^1,2, 潘涛², 苏航², 刘洪喜¹

1.昆明理工大学材料科学与工程学院昆明 650093
2.钢铁研究总院结构材料研究所北京 100081

Effect of Copper on Strength and Cryogenic Toughness of 9Ni Steel

OUYANG Huangsheng^1,2, PAN Tao², SU Hang², LIU Hongxi¹

1.College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2.Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081

引用本文:

欧阳凰生潘涛苏航刘洪喜. Cu对9Ni钢强度和低温韧性的影响[J]. 材料研究学报, 2012, 26(3): 315-320.
, , , . Effect of Copper on Strength and Cryogenic Toughness of 9Ni Steel[J]. Chin J Mater Res, 2012, 26(3): 315-320.

全文: PDF(1032 KB)

摘要: 研究了Cu含量(质量分数)对9Ni钢强度和低温韧性的影响, 并结合显微组织观察和精细结构分析了含铜9Ni钢的强韧化机理。结果表明, 经过淬火+两相区淬火+回火(QLT)处理, Cu含量由0提高到1.5%, 9Ni钢的室温屈服强度和抗拉强度分别提高约150和105 MPa; 随着Cu含量的提高-196℃低温冲击功呈现先增加后降低的趋势,
Cu含量为1.0%时达到最高值157 J, 而所有含铜9Ni钢的冲击功均保持在较高的水平。随着Cu含量的增加, 钢中二次回火马氏体增加而铁素体减少；颗粒或短杆棒状Cu析出物在基体上析出, 组织强化与析出强化共同使钢的强度提高。同时, Cu的加入提高了二次回火马氏体板条边界上的逆转奥氏体含量, 并富集于逆转奥氏体中提高其稳定性, 从而提高了钢的低温韧性。

关键词 ：金属材料, 强度, 低温韧性, Cu析出物, 逆转奥氏体

Abstract：The effect of copper addition on the strength and cryogenic toughness of 9Ni steel was investigated and the mechanism of strengthening and toughening of Cu-bearing 9Ni steel was discussed in connection with the microstructure characteristics. The results show that the room-temperature yield strength and ultimate tensile strength of the 9Ni steels heat-treated by quenching + lamellarizing + tempering (QLT) process increase by about 150 and 105 MPa respectively when the copper content was increased from 0% to 1.5%. And the impact energy at −196 increased as Cu content increases within 1% but decreased beyond 1%. At the same time, highest impact energy reaches to 157 J for Cu content of 1.0% though the steels with other Cu contents also have high level impact energy. The microstructure observation result reveals that, with increasing Cu, the strength increased due to increasing secondary tempered martensite and Cu particles precipitated finely. On the other hand, Cu addition increases the volume fraction of reversed austenite and improves the stability of formed reversed austenite resulting in cryogenic toughness improvement.

Key words： metallic materials strength cryogenic toughness copper precipitates reversed austenite

收稿日期: 2012-01-09

ZTFLH:

TG142

基金资助:

国家高技术研究发展计划2007AA03Z506资助项目。

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