|
|
|
| Effect of Copper on Strength and Cryogenic Toughness of 9Ni Steel |
| OUYANG Huangsheng1,2, 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 |
|
Cite this article:
OUYANG Huangsheng PAN Tao SU Hang LIU Hongxi. Effect of Copper on Strength and Cryogenic Toughness of 9Ni Steel. Chin J Mater Res, 2012, 26(3): 315-320.
|
|
|
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.
|
|
Received: 09 January 2012
|
|
|
| Fund: Supported by National High Technology Research and Development Program of China No.2007AA03Z506. |
| 1 ZHANG Futian, LOU Zhifei, Behaviour of microstructure of Ni9 steel under deforming–fracturing, Acta Metall Sin, 30(6), 239(1994)(张弗天, 楼志飞, Ni9钢的显微组织在变形--断裂过程中的行为, 金属学报, 30(6), 239(1994))2 YANG Yuehui, CAI Qingwu, WU Huibin, WANG Hua, Formation of reversed austenite and its effect on cryogenic toughness of 9Ni steel during two–phase region heat treatment, Acta Metall Sin, 45(3), 270(2009)(杨跃辉, 蔡庆伍, 武会宾, 王华, 两相区热处理过程中回转奥氏体的形成规律及其对9Ni钢低温韧性的影响, 金属学报, 45(3), 270(2009))3 B.Fultz, J.W.Morris, The mechanical stability of precipitated austenite in 9Ni steel, Metall. Trans., 16(12), 2251(1985)4 Nobuo Nakada, Toru Yamashita, Junaidi Syarif, Toshihiro Tsuchiyama, Setsuo Takaki, Setsuo Takaki, Effect of Cu addition on formation of reversed austenite and hardness in 9%Ni steels, Tetsu–to–Hagane, 89(10), 46(2003)5 Nobuo Nakada, Junaidi Syarif, Toshihiro Tsuchiyama, Setsuo Takaki, Improvement of strength–ductility balance by copper addition in 9%Ni steels, Materials and Engineering A, 374(1–2), 137(2004)6 YONG Qilong, The second phase in Iron and steel materials, 1, (Beijing, Metallurgical Industry Press, 2006) p.127(雍岐龙, 钢铁材料中的第二相, 1 (北京, 冶金工业出版社, 2006) p.127)7 Chol K.Syn, J.W.Morris, Sungho Jin, Cryogenic fracture toughness of 9Ni steel enhanced through grain refinement, Metall. Mater. Trans., 7(12), 1827(1976)8 C.W.Marschall, R.F.Hehemann, A.R.Troiano, The characteristics of nine percent nickel low carbon steel, Trans. ASM, 55, 135(1962)9 B.Fultz, J.I.Kim, Y.H.Kim, H.J.Kim, G.O.Fior, J.W.Morris, The stability of precipitated austenite and the toughness of 9Ni steel, Metall. Trans., 16(12), 2237(1984)10 E.Rasanen, Decomposition of austenite in Fe–Cu alloys, Scandinavian Journal of Metallurgy, 2(5), 257(1973)11 Yang Yuehui, Cai Qingwu, Tang Di, Wu Huibin, Precipitation and stability of reversed austenite in 9Ni steel, International Journal of Minerals, Metallurgy, and Materials, 17(5), 587(2010) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
