Search

Your search keyword '"Zhou, Lanzhang"' showing total 182 results
Start Over Author "Zhou, Lanzhang"
182 results on '"Zhou, Lanzhang"'

3. Microstructure evolution and mechanism of IC10 alloy under over-temperature and stress condition

Author

LIU Mingkun, WANG Wei, WU Yunsheng, TONG Wenwei, QIN Xuezhi, and ZHOU Lanzhang

Subjects
ic10 alloy, over-temperature, thermal exposure, microstructure evolution, rafting, superalloy, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The microstructure evolution under over-temperature （1070-1250 ℃） and tensile/compressive stress （30-90 MPa） conditions of IC10 alloy was analyzed to simulate the alloy deterioration process during over-temperature operation of gas turbine blades.The results show that the degeneration of secondary γ' phase in IC10 alloy during thermal exposure without stress includes spheroidizing， coarsening， and redissolution. As thermal exposure temperature and time increase， the shape of secondary γ' phase transforms from flower-like to rounded cubic and spherical， driven by the decrease of γ/γ' phase interface energy. The area fraction of secondary γ' phase decreases with the increase in temperature and the prolonging of time. The secondary γ' phase is completely redissolved after thermal exposure at 1225-1250 ℃ for more than 50 h. The size of secondary γ' phase increases with the increase in temperature and time. The coarsening of γ' phase conforms to the Lifshitz-Slozov-Wagner theory controlled by diffusion. Under the overtemperature and stress condition， the rafting of γ' phase gradually intensifies with the increase of temperature. The tensile stress promotes the N-type rafting of γ' phase perpendicular to the stress axis， while the compressive stress promotes the P-type rafting of γ' phase parallel to the stress axis. The γ' phase rafting process is faster under the tensile stress state than under the compressive stress. The microstructure of IC10 alloy under over-temperature and stress conditions can be used to evaluate the service conditions of the blade after service.

Published
2024
Full Text
View/download PDF

29. Ni-Fe Based Alloy GH984G Used for 700 °C Coal-Fired Power Plants

Author

Wang, Changshuai, Wang, Tingting, Guo, Jianting, Zhou, Lanzhang, Zhao, Haiping, Xu, Songqian, Liu, Xingbo, editor, Liu, Zhengdong, editor, Brinkman, Kyle, editor, Das, Subodh, editor, Dryepondt, Sebastien, editor, Fergus, Jeffrey W., editor, Guo, Zhancheng, editor, Han, Minfang, editor, Hawk, Jeffrey A., editor, Horita, Teruhisa, editor, Hosemann, Peter, editor, Li, Jian, editor, Olivetti, Elsa, editor, Pandey, Amit, editor, Rebak, Raul B., editor, Roy, Indranil, editor, Shang, Chengjia, editor, and Zhang, Ji, editor

Published
2017
Full Text
View/download PDF

36. Microstructural Evolution and Mechanical Properties of a Ni-Based Alloy with High Boron Content for the Pre-Sintered Preform (PSP) Application.

Author

Gong, Xiufang, Wu, Yunsheng, Gao, Zhenhuan, Sun, Youbei, Guan, Yingbo, Guan, Xianjun, Qin, Xuezhi, Hou, Jieshan, and Zhou, Lanzhang

Subjects
NICKEL alloys, HEAT treatment, COHESION, ALLOYS, MELTING points, BORON, TENSILE strength
Abstract

The pre-sintered preform (PSP) is an advanced technology for repairing the Ni-based superalloy blade in a turbine. In general, boron is added to the Ni-based superalloys in small quantities (<0.1 wt.%) to increase boundary strength and cohesivity. Despite this, the effect of high B content (>1.0 wt.%) on the microstructure evolution and mechanical properties in Ni-based superalloys for the PSP application is rarely studied. The variety, composition and evolution of the precipitates during solution heat treatment in the alloy with high B content were determined by EBSD, EPMA and SEM. The results indicate that Cr, W and Mo-rich M5B3 type borides precipitate from the matrix and its area fraction reaches up to about 8%. The area fraction of boride decreases with the prolonging of solution time and the increase of temperature higher than 1120 °C. The borides nearly disappear after solution treatment at 1160 °C for 2 h. The redissolution of boride and eutectic results in the formation of B-rich area with low incipient melting (about 1189 °C). It can bond metallurgically with the blade under the melting point of the blade, which decreases the precipitation of harmful phases of the blade after PSP repairing. The microhardness within the grain in the PSP work-blank first decreases (lower than 1160 °C) and then increases (higher than 1185 °C) with the increase of solution heat treatment temperature due to the dissolving and precipitation of borides. The tensile strength of the combination of PSP work-blank and Mar-M247 matrix at room temperature after solution treatment is related to the area fraction of boride, incipient melting and the cohesion between PSP work-blank and Mar-M247 matrix. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

40. Primary-Dendrite-Pattern Regulation by Secondary Branch During the Directional Solidification of the Single Crystal Superalloy

Author

Yuan, Xiaotan, primary, Hu, Xingjin, additional, Zhang, Congjiang, additional, Yu, Hongbin, additional, Ren, Weili, additional, Ding, Biao, additional, Lu, Haibiao, additional, Zhong, Yunbo, additional, Lei, Zuosheng, additional, Wang, Hui, additional, Wang, Qiuliang, additional, Liaw, Peter K., additional, Qin, Xuezhi, additional, and Zhou, Lanzhang, additional

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results