淬火温度对超超临界火电站用COST-FB2钢显微组织和室温强度的影响

doi:10.11896/cldb.21030261

Abstract
Figure/Table
References
Related Citation (2)

Download:

Full Text ( PDF ) (8625KB)
Export: BibTeX | EndNote (RIS)

Abstract COST-FB2 steel is commonly used in the turbine rotors of ultra-supercritical power plants owing to its excellent high temperature creep strength. The samples used in this work were cut from the body area of a 20-ton of COST-FB2 steel forging rotor that China independently developed. Quenching at different temperatures and two-step tempering were realized for the heat treatment of COST-FB2 steel. Then, the mechanical properties of the steel were tested, and the effect of quenching temperature on the microstructure of COST-FB2 steel was characterized. The results demonstrate that when the quenching temperature increased from 1 000 ℃ to 1 150 ℃, the hardness and the strength of COST-FB2 steel increased continuously while the plasticity varied slightly and the impact energy first increased from 10 J to 23.5 J but then decreased. When the quenching temperature increased from 1 000 ℃ to 1 150 ℃, the prior austenite grain (PAG) size of COST-FB2 steel increased from 65.5 μm to 212.1 μm, the block width increased from 4.75 μm to 6.04 μm, and the dislocation density increased from 4.8×10⁹ cm^-2 to 11.8×10⁹ cm^-2. Strengthening calculations helped determine that strengthening dispersion and dislocation are the primarily contributors for improving the yield strength of tempered COST-FB2 steel. Grain boundary and block boundary strengthening are superimposed with the sum of matrix strengthening, dispersion strengthening and dislocation strengthening increments. In summary, the superimposed block boundary strengthening increment corresponded to the experimentally obtained yield strength. This study can help improve the overall heat treatment of large forging rotors and domesticate them.

Key words： COST-FB2 steel quenching temperature microstructure and mechanical properties strengthen mechanism

Published: Online: 2022-07-26

CLC number:

TG156

Fund:National Natural Science Foundation of China(51971226).

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	YIN Huifang
	ZHAO Jiqing
	YANG Gang

Cite this article:

YIN Huifang,ZHAO Jiqing,YANG Gang. Effect of Quenching Temperature on Microstructures and Room Temperature Strength of COST-FB2 Steel Used in Ultra-supercritical Coal-fired Power Plants[J]. Materials Reports, 2022, 36(14): 21030261-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21030261 OR http://www.mater-rep.com/EN/Y2022/V36/I14/21030261

1 Zeiler G. Materials for ultra-supercritical and advanced ultra-supercritical power plants, Di Gianfrancesco A, ed, Elsevier, Netherlands, 2017, pp.162.
2 Rod Vanstone Ian Chilton,Pawel Jaworski. Journal of Engineering for Gas Turbines and Power, 2013, 135,1.
3 Taylor M,Thomton D V. IMechE Conference Transactions,1997, 2,125.
4 Zia-ebrahimi F, Krauss G. Acta Metallurgica,1984, 32(10), 1767.
5 Dudova N, Mishnev R, Kaibyshev R. Iron and Steel Institute of Japan, International, 2011, 51(11),1912.
6 Wang P, Kang M K.Transactions of Materials and Heat Treatment, 1983, 4(2),19(in Chinese).
王平, 康沫狂.金属热处理学报, 1983, 4(2), 19.
7 Morito Shigekazu, Igarashi Ryota, Kamiya Keiichiro, et al. Materials Science Forum, 2010, 638-642, 1459.
8 Zhang Y Q,Gu J F, Han L Z, et al. Journal of Materials Research and Technology,2021, 12, 2462.
9 Yin H F,Yang G,Zhao J Q.Iron and Steel,2021,56(5),91(in Chinese).
殷会芳, 杨钢, 赵吉庆.钢铁, 2021, 56(5), 91.
10 Peng L Z. Development of electroslag remelting slag for COST-FB2 steel. Master's Thesis, Northeastern University, China, 2016(in Chinese).
彭雷朕. 电渣重熔COST-FB2钢用渣系开发. 硕士学位论文,东北大学, 2016.
11 Zeng X. Effect of heat treatment on the microstructure and properties of COST-FB2 steel. Master's Thesis, Kunming University of Science and Technology, China, 2017(in Chinese).
曾骁. 热处理工艺对COST-FB2钢组织和力学性能的影响. 硕士学位论文, 昆明理工大学, 2017.
12 Zhang Y. Effect of solid solution treatment on the microstructure and properties of COST-FB2 steel.Master's Thesis, Kunming University of Science and Technology, China, 2018(in Chinese).
张煜. 固溶工艺对FB2转子钢组织与性能的影响. 硕士学位论文, 昆明理工大学, 2018.
13 Zhang Y Q, Li C W,Shen G, et al. Steel Research International, 2021,92(4), 1.
14 Li K J,Cai Z P, Wu Y, et al. Acta Metallurgica Sinica, 2017, 53(7),778(in Chinese).
李克俭,蔡志鹏,吴瑶,等.金属学报, 2017, 53(7), 778.
15 Zhang Y, Zhao J Q, Li L, et al.Heat Treatment of Metals, 2019, 44(1),142.(in Chinese).
张煜, 赵吉庆, 李莉,等. 金属热处理, 2019, 44(1),142.
16 Wang X, Zhang X Y,Ouyang J G, et al. CFHI Technology, 2016, 169(1),68(in Chinese).
王欣, 张喜英, 欧阳建国,等. 一重技术, 2016, 169(1),68.
17 Abe F.Science and Technology of Advanced Materials, 2008, 9 (1),1.
18 Galindo-Nava E I, Rivera-Díaz-Del-Castillo P E J. Acta Materialia,2015, 98,81.
19 Yan P, Liu Z D,Bao H S, et al. Materials Science and Engineering A, 2014, 597,148.
20 Moon J, Lee T H, Kim S D, et al.Materials Characterization, 2020,170,2.
21 Morito S, Yoshida H, Maki T, et al. Materials Science and Engineering A,2006, 438-440, 237.
22 Maruyama K, Sawada K, Koike J.Journal of the Iron and Steel Institute of Japan International, 2001, 41(6), 641.
23 Fedorova I, Kostka A, Tkachev E, et al. Materials Science and Enginee-ring A, 2016, 662, 443.
24 Grybnas A, Makareviius V, Baltunikas A, et al. Materials Science and Engineering A, 2017, 696,453.
25 Hu Z F.Application research and evaluation of martensitic heat resistant steel, Science Press, China, 2018, pp. 25(in Chinese).
胡正飞.马氏体耐热钢的应用研究与评价,科学出版社,2018,pp.25.
26 Hättestrand M, Andrén H O. Mircron, 2001, 32(8), 789.
27 Wang C F, Wang M Q, Shi J, et al. In: Conference Record of the 2th Electron Backscatter Diffraction Technique and its Applications. Inner Mongolia, 2007(in Chinese).
王春芳, 王毛球, 时捷, 等. 第二届电子背散射衍射技术及其应用会议.内蒙古,2007.
28 Wang C F, Wang M Q, Shi J, et al. Scripta Materialia,2008,58(6),492.