Mechanical Properties and Microstructure Evolution of S30432 Served in a Double-reheat Ultra-supercritical Power Plant

被引：0

作者：

Li J. ^{[1
]}

Tang L. ^{[1
]}

Li J. ^{[1
]}

Zhou R. ^{[1
]}

Zhang Z. ^{[1
]}

Chen Z. ^{[2
]}

Wang B. ^{[1
]}

Hou S. ^{[1
]}

机构：

[1] Xi'an Thermal Power Research Institute Co., Ltd., Xi'an, 710032, Shaanxi Province

[2] Huaneng Anyuan Power Generation Co., Ltd., Pingxiang, 337016, Jiangxi Province

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 22期

关键词：

Double reheat; Mechanical property; Microstructure evolution; S30432 stainless steel; Ultra-supercritical (USC);

D O I：

10.13334/j.0258-8013.pcsee.190103

中图分类号：

学科分类号：

摘要：

The applicability of shot peened S30432 austenitic boiler tubes in the 620℃ ultra-supercritical power plant was evaluated in the present work. Mechanical properties, fracture characteristics, structure of the oxide film, as well as the microstructure evolution behaviour were all well investigated, utilizing SEM, TEM, EDS, etc. All the specimens were sectioned from the end superheater after exposure for different durations. Results indicated that with the prolonging of exposure time, both of the tensile strengths (at room temperature and at 650℃) and Brinell hardness only show a slight fluctuation in a small range. The impact value at room temperature decreased gently with time, while the size of fracture dimples grew slowly. It means a reduction of ductile and increment of inhomogeneity deformation behaviour. The oxide scale on the inner surface of the S30432 was dense and compact, with its thickness less than 1 μm even after served for 17367h. After exposed for 14176h, Cu-rich particles distributed homogeneously in the matrix, and its size grew slowly to about 25 nm. The amount of M23C6 typed carbides at grain boundaries increased gradually in chain-like arrangement. In a word, the shot peened S30432 boiler tubes can meet mechanical and microstructural requirements of end superheaters in the 620℃ double reheat ultra-supercritical unit. © 2019 Chin. Soc. for Elec. Eng.

引用

页码：6640 / 6647

页数：7

共 20 条

[1] The electric power development planning "in 13th Five-Year"(2016-2020), pp. 11-12, (2016)
[2] Bugge J., Kjaer S., Blum R., High-efficiency coal-fired power plants development and perspectives, Energy, 31, 10-11, pp. 1437-1445, (2006)
[3] Kosman W., The influence of external cooling system on the performance of supercritical steam turbine cycles, Archives of Thermodynamics, 31, 3, pp. 131-144, (2010)
[4] Rashidi M.M., Aghagoli A., Ali M., Thermodynamic analysis of a steam power plant with double reheat and feed waterheaters, Advances in Mechanical Engineering, (2014)
[5] Li Y., Zhou L., Xu G., Et al., Thermodynamic analysis and optimization of a double reheat system in an ultra-supercritical power plant, Energy, 74, pp. 202-214, (2014)
[6] Cai B., Gao H., Wang J., Et al., Dynamic process characteristic analysis and control strategy verification on double-reheat ultra-supercritical coal-fired power units, Proceedings of the CSEE, 36, 19, pp. 5288-5299, (2016)
[7] Zhu B., Zhou R., Problems paid attention to raise the ultra supercritical units steam parameters, Proceedings of the CSEE, 29, pp. 95-100, (2009)
[8] Tadge P., Gupta P.K., Sasikumar C., Surface nano- crystallizationof AISI 304 stainless steel through shot peening technique, Materials Today: Proceedings, 2, 4-5, pp. 3245-3250, (2015)
[9] Unal O., Varol R., Surface severe plastic deformation of AISI 304 via conventional shot peening, severe shot peening and repeening, Applied Surface Science, 351, pp. 289-295, (2015)
[10] Li J., Chen Z., Tang L., Et al., Microstructure investigation on S30432 steel used forheating surface tubes of a double-reheat boiler, Thermal Power Generation, 46, 8, pp. 72-76, (2017)

← 1 2 →