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Featured researches published by Guo Jianting.


Acta Metallurgica Sinica | 2010

THE CURRENT SITUATION OF APPLICATION AND DEVELOPMENT OF SUPERALLOYS IN THE FIELDS OF ENERGY INDUSTRY

Guo Jianting

Superalloys are extensively applied in the fields of energy industry. In the high parameter ultra-supercritical boiler used for coal-fired generation, superheater/reheater tubes must be made of superalloys which meet the requirement of good creep resistant, good fire-side corrosion resistant and steam-side oxidation resistant properties. In gas turbine engine used for gas power, turbine blades and guide vanes should be made of hot-corrosion resistant superalloys which must meet the requirements with respect to excellent high temperature corrosion resistance and long-term microstructural stability. In the field of nuclear power, heat exchange tubes used for steam generator require superalloys with excellent solution corrosion resistance. In the field of coal gasification and energy conservation and pollution reduction, the superalloys with excellent hot corrosion resistant and high temperature wear resistant properties are widely applied. In petroleum exploitation, especially in deep mining, drilling tools must be made of corrosion resistant and wear resistant superalloys because of the sour environment, the temperature of 4—150 and the existences of CO2 ,H 2S, sand and so on. This paper makes a brief introduction on the current situation of application and development of the superalloys at home and abroad in these fields.


Acta Metallurgica Sinica | 2010

THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G

Peng Sheng; Zhou Lanzhang; Hou Jieshan; Guo Jianting

DZ417G is a directionally solidified (DS) superalloy developed for low-pressure blade applications in gas turbine engines. The crystallization microstructures of DZ417G samples caused by sand-blasting and machining were investigated. The tensile properties of the alloy after crystalliza- tion were tested at room temperature and 900 and its stress-rupture performance was examined under conditions of 980 /216 MPa and 760 /725 MPa. The results show that after solution treat- ment equiaxed recrystallization grains form on the surface of specimens machined from directionally solidified alloy bars. After aging treatment, cellular recrystallization takes place on the surface of spec- imens pretreated by sand blasting. Both the yield strength and tensile strength at room temperature decrease after recrystallization, while those at 900 are slightly affected by recrystallization. The recrystallization depth increases after stress-rupture tests, which may be attributed to migration of recrystallization boundaries driven by high temperature and stress. For samples without recrystalliza- tion microstructure, the fracture mode is transgranular, which is controlled by the propagation rate of the cracks initiated both on surface and at inner microstructure discontinuities. While for samples with recrystallization microstructure, the cracks prefer to be initiated on transverse recrystallization grain boundaries and propagate along the recrystallization boundaries into the matrix, which may accelerate the propagation rate. TRF (transverse recrystallization area fraction) is a factor to evaluate the effect of recrystallization on the stress-ruptured performance. The stress-ruptured performance is decreased with the increase of TRF between 0 and 0.5. For samples with a TRF of 0.5, second cellular recrystallization forms in the first equiaxed recrystallization grain. The cracks initated at interfaces of cellular microstructure have a high density, which impair the stress-ruptured performance of DZ417G alloy.


Acta Metallurgica Sinica | 2010

REVIEW ON WHROUGHT SUPERALLOY AND EQUI-AXED CRYSTAL CAST SUPERALLOY MATERIALS AND THEIR APPLICATION BASIC THEORIES

Guo Jianting

Some application basic theories related to the research and development of wrought superalloys and equiaxed grain cast superalloys were reviewed simply.The main contents are wrought superalloys and mechanisms of effect of minor elements;equiaxed crystal cast superalloys and creep mechanisms;and hot-corrosion resistant superalloys and discovery of new phase transformation as well as interaction effect of creep-fatigue-environment.


Acta Metallurgica Sinica | 2005

A superheater tube superalloy GH2984 with excellent properties

Guo Jianting; Du Xiukui


The Chinese Journal of Nonferrous Metals | 2011

High temperature structural intermetallics and their strengthening-softening mechanisms

Guo Jianting; Zhou Lanzhang; Li Gusong


Acta Metallurgica Sinica (english Letters) | 2017

Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways

Li Haitao; Liang Yongchun; Zhong Wanli; Qin Xuezhi; Guo Jianting; Zhou Lanzhang; Ren Weili


The Chinese Journal of Nonferrous Metals | 2011

Effect of Hf on microstructure and mechanical behavior of hot corrosion resistant Ni-based superalloys

Hou Jieshan; Cong Peijuan; Zhou Lanzhang; Qin Xuezhi; Yuan Chao; Guo Jianting


The Chinese Journal of Nonferrous Metals | 2011

Effects of several minor elements on superalloys and their mechanism

Guo Jianting


Materials Letters | 2007

Compressive properties of high-pressure die cast IP 75 alloy with strengthening Laves phase

Du Xinghao; Guo Jianting; Wu Baolin


Acta Metallurgica Sinica | 2006

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NiAl(Ti)-Cr(Mo) EUTECTIC ALLOY

Xiao Xuan; Guo Jianting

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Zhou Lanzhang

Chinese Academy of Sciences

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Hou Jieshan

Chinese Academy of Sciences

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Qin Xuezhi

Chinese Academy of Sciences

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Du Xinghao

Shenyang Aerospace University

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Du Xiukui

Chinese Academy of Sciences

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Li Gusong

Chinese Academy of Sciences

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Li Haitao

South China University of Technology

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Peng Sheng

Chinese Academy of Sciences

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Qi Yihui

Chinese Academy of Sciences

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