Affiliation:
1. Central Iron and Steel Research Institute
2. Iron and Steel Co. Ltd.
3. Yanshan University
Abstract
Microstructure and mechanical properties in QT-Treated 9Ni steel were investigated. The detail microstructures were observed by optical microscope (OM) and transmission electron microscope (TEM). The volume fraction of austenite was estimated by XRD. Tensile test at room temperature and Charpy-V-Notch (CVN) impact test at -196°C were carried out. The results showed that the microstructure of QT-treated 9%Ni steel was composed of tempered martensite and reversed austenite. The brittle cementite was absorbed gradually by the increasing reversed austenite as the tempering temperature increased. The optimum tempering temperature range was 560°C~580°C. The reversed austenite could improve the cryogenic toughness of 9Ni steel through the combination of the scavenging effect and the TRIP effect.
Publisher
Trans Tech Publications, Ltd.
Reference10 articles.
1. S. Ruester. The Prospects for Liquefied Natural gas Development in the US. Energy Policy, 2008, 36(8): 3160.
2. G.F. Qiao, Y.X. Li. The Present Situation and Future of Liquefied Natural gas Industry in China. Oil ＆{TTP}-250 Gas Storage and Transportation. 2005, 24(3): 1.
3. Y.H. Yang, Q.W. Cai, D. Tang, et al. Precipitation and Stability of Reversed Austenite in 9Ni steel. International Journal of Minerals, Metallurgy and Materials, 2010, 17(5): 587-595.
4. J.R. Strife, D.E. Passoja. The Effect of Heat Treatment on Microstructure and Cryogenic Fracture Properties in 5Ni and 9Ni Steel. Metallurgical Transactions A, 1980, 11(8): 1341-1345.
5. H.J. Choi, L.H. Schwatz. Fatigue Crack Propagation in Intercritically Tempered Fe-9Ni-0. 1C and Fe-4Mn-0. 15C. Metallurgical Transactions A, 1983, 14(6): 1089-1093.
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