Shanghai Electrical Power Generation Equipment Co.

Shanghai, China

Shanghai Electrical Power Generation Equipment Co.

Shanghai, China
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Wang W.,Shanghai JiaoTong University | Xu S.,Shanghai Electrical Power Generation Equipment Co. | Liu Y.,Shanghai JiaoTong University
Journal of Engineering for Gas Turbines and Power | Year: 2017

The aim of this study was to investigate the cyclic creep-fatigue interaction behavior in a steam turbine inlet valve under cyclic thermomechanical loading conditions. Three years and nine iterations of idealized startup-steady-state operation-shutdown process were chosen. The Ramberg-Osgood model, the Norton-Bailey law, and continuum damage mechanics were applied to describe the stress-strain behavior and calculate the damage. The strength of the steam valve revealed that significant stress variation mainly occurred at the joint parts between the valve diffuser and the adjust valve body, due to the combination of the enhanced turbulent flow and assembly force at these areas. The contact stress at the region of component assembly was sensitive to the cyclic loading at the initial iterations. The maximum decrease amplitude in the normalized contact stress between the second and the fourth iterations reached 0.12. The damage analysis disclosed that the notch of the deflector in the adjust valve had the maximum damage due to the stress concentration. Copyright © 2017 by ASME.


Lu F.,Shanghai JiaoTong University | Liu P.,Shanghai University | Ji H.,Shanghai University | Ding Y.,Shanghai Electrical Power Generation Equipment Co. | And 2 more authors.
Materials Characterization | Year: 2014

10%Cr steels are being used in steam power plant due to their excellent properties at high temperatures. Dramatically enhanced impact toughness was obtained in the welded 10%Cr rotor steel after post-weld heat treatment, increasing from 5.0 J for the as-welded material to 37.5 J after being heat treated at 730 °C. Analysis of crystallographic structure showed that the microstructure was transformed from as-welded lath martensite to tempered martensite (treated at 670 °C to 700 °C), and then to high-temperature tempered martensite (treated at over 710 °C). With the increase of treatment temperature, the fractography varied from brittle fracture to a fracture mode with both brittle and ductile fracture features. A small amount of M 7C3 (M = Fe, Cr) particles was found in as-welded metals, while large amounts of M23C6 particles were observed in those after being treated. It is proposed that the microstructure evolution from martensitic laths in the as-welded metals to a softer ferrite matrix with the dispersion of metal carbides led to higher toughness in the post-weld heat treatment materials. © 2014 Elsevier Inc.


Xu Y.,Shanghai University | Yang C.,Shanghai University | Ran Q.,Shanghai University | Hu P.,Shanghai University | And 3 more authors.
Materials and Design | Year: 2013

Four heat treatments have been designed to produce multi-modal size distributions of γ' phase in γ matrix, and stress-rupture properties of Nimonic 80A have been investigated. The γ' phase exhibits two typical coherent orientation relationships with γ matrix. The fine γ' particles are in spherical shape when the average size is about 20nm. However, the coarse γ' particles present a cuboidal shape with round corners when they are larger than 75nm. The Al and Ti elements diffuse from γ matrix to γ' phase, and about 80% Al and Ti are used to form γ' phase after various heat treatments. The increased volume fraction of the fine γ' particles with average size of 15.8-20.3nm increases the stress-rupture life of Nimonic 80A at 750°C/310MPa. The rod-like Cr23C6 carbide at grain boundary can suppress grain boundary sliding at high temperature and benefit the stress-rupture life. The coarse γ' particles facilitate the movement of dislocations and contribute to the ductility. The precipitate of multi-modal size distributions of γ' phase is beneficial to the stress-rupture ductility. © 2012 Elsevier Ltd.


Xu Y.,Shanghai University | Yang C.,Shanghai University | Xiao X.,Shanghai University | Cao X.,Baosteel | And 2 more authors.
Materials Chemistry and Physics | Year: 2012

Nickel-based superalloy Nimonic 80A modified with various Al and Ti contents has been developed. The γ′ coherently precipitates in the γ matrix on {100} γ′/γ and {110} γ′/γ atomic planes. The volume fraction of γ′ increases significantly with the increase of Al and Ti contents. But the volume fraction of γ′ decreases after stress-rupture tests compared with that after full heat treatment, which is primarily due to the coarsening of γ′ and the increased width of γ matrix channel. The strengthening effect of Ti is more significant than that of Al at room temperature. While the strengthening effect of Al is more significant than that of Ti at 750°C/310 MPa. The increased volume fraction of γ′ leads to the increased room temperature tensile strength and stress-rupture life at 750°C/310 MPa. However, the η-Ni 3Ti is identified after full heat treatment in the alloys when the Ti content is about 2.7 wt.%, which results in decreased stress-rupture life. But the precipitate of η-Ni 3Ti does no harm to the room temperature tensile properties. © 2012 Elsevier B.V. All rights reserved.


Yang C.,Shanghai University | Xu Y.,Shanghai University | Nie H.,Shanghai University | Xiao X.,Shanghai University | And 2 more authors.
Materials and Design | Year: 2013

Effects of heat treatments on room temperature mechanical properties and stress-rupture properties of Rene 80 have been investigated. The microstructures were analyzed by optical microscope and scanning electron microscope after each step of heat treatments. With the decrease of aging temperature, the average size of γ' phase decreases, but the volume fraction of γ' phase increases. The lower aging temperature suppresses the growing of the coarse γ' particles, but facilitates the growth of the fine γ' particles. After the optimum heat treatment, the ultimate tensile strength and yield strength are respectively higher than 1040MPa and 950MPa, the stress-rupture life at 871°C/310MPa is higher than 170h with excellent ductility. The improved tensile strength and stress-rupture life are primarily due to the increased volume fraction of γ' phase. The borides precipitate at grain boundaries at about 913°C. The primary MC is found to decompose into M6C at about 873°C and M23C6 at 840-873°C at grain boundaries. The precipitate of the carbides may partly contribute to the improved mechanical properties. © 2012 Elsevier Ltd.


Wang C.-D.,Shanghai JiaoTong University | Chen M.,Shanghai JiaoTong University | An Q.-L.,Shanghai JiaoTong University | Wang M.,Shanghai Electrical Power Generation Equipment Co. | Zhu Y.-H.,Shanghai Electrical Power Generation Equipment Co.
International Journal of Precision Engineering and Manufacturing | Year: 2014

Minimum quantity lubrication (MQL) is one of the promising Green Manufacturing Technology to meet the challenge of machining difficult-to-cut material Inconel 182 which is deposited by Shield Metal Arc Welding (SMAW). Unlike the flood lubrication, in MQL, only a small amount of non-toxic biodegradable oil are directly sprayed to the cutting zone by compressed air, which can reduce friction coefficient and temperature. Wear performance of uncoated tool inserts and Physical Vapor Deposition (PVD) coated tool inserts are evaluated by comparison during up and down face milling Inconel 182 with different MQL nozzle positions. Results indicate that uncoated tool inserts are not suitable for face milling Inconel 182 in all lubrication conditions due to the severe flank wear and the catastrophic breakage. On the contrary, PVD coated tool inserts have longer tool life compared to uncoated ones in all lubrication conditions. MQL nozzle positioned at tool cut into workpiece and positioned at tool cut out of workpiece in down milling as well as MQL nozzle positioned at tool cut out of workpiece in up milling can effectively prolong tool life of PVD coated tool inserts, which can be selected as the optimal lubrication solution for face milling Inconel 182. © 2014 Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg.


Su N.,Shanghai Publishing and Printing College | Xu H.,Shanghai Publishing and Printing College | Cao Z.,Shanghai Electrical Power Generation Equipment Co.
Lecture Notes in Electrical Engineering | Year: 2016

A series of polypyrrole (PPy) doped with anionic spherical polyelectrolyte brushes (ASPB) (PPy/ASPB composite) at different polymerization variables (the amount of ASPB, molecular weight of grafted chains, polymerization time, and polymerization temperature) were synthesized by means of chemical oxidative polymerization, characterized with FTIR and analyzed by electrical conductivity measurements. Results verified that long grafted chains and low temperature helped to increase the electrical conductivity. ASPB acted both as dopant and as template in the polymerization process as a result of offering favorable space factors for the growth of pyrrole. © Springer Science+Business Media Singapore 2016.


Zuo Z.,Tsinghua University | Liu S.,Tsinghua University | Fan Y.,Shanghai Electrical Power Generation Equipment Co. | Wu Y.,Tsinghua University
Advances in Mechanical Engineering | Year: 2014

It is important to evaluate the economic efficiency of boiler circulating pumps in manufacturing process from the manufacturers' point of view. The possibility of optimizing the pump casing with respect to structural pressure integrity and hydraulic performance was discussed. CFD analyses of pump models with different pump casing sizes were firstly carried out for the hydraulic performance evaluation. The effects of the working temperature and the sealing ring on the hydraulic efficiency were discussed. A model with casing diameter of 0.875D40 was selected for further analyses. FEM analyses were then carried out on different combinations of casing sizes, casing wall thickness, and materials, to evaluate its safety related to pressure integrity, with respect to both static and fatigue strength analyses. Two models with forging and cast materials were selected as final results. © 2014 Zhigang Zuo et al.


An C.,Shanghai Electrical Power Generation Equipment Co. | Liang L.,Pan Asia Technical Automotive Center Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

A comprehensive microstructure evolution of 1Cr12Mo steel high-press steam turbine blade under the condition of long-term service was investigated, especially focusing on the influence of temperature and pressure on microstructure of the steel. The microstructure of the blades was analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results indicate that appropriate stress can promote the precipitation of carbide particles along the boundaries of lathes and the inside of the lathes. These very fine precipitated particles can retard the formation of dislocation tangles and dislocation cells. It is considered that the density of dislocation is reduced dramatically due to the formation of the dislocation cells. The temperature has a negligible impact on the formation and evolution of martensite and dislocation cells, while has a significant effect on the increasing the growth velocity of carbides. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Wu H.-L.,Shanghai Electrical Power Generation Equipment Co. | Zhu Y.-M.,Shanghai Electrical Power Generation Equipment Co. | Jia G.-Q.,Shanghai Electrical Power Generation Equipment Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

Low cycle fatigue (LCF) experiments were carried out under strain control at room temperature on X12CrMoWVNbN10-1-1 steel for rotors used in ultra-supercritical turbines. Some LCF parameters of this material at room temperature including Ramberg-Osgood parameters, Manson-Coffin parameters and transformation life were obtained by fitting the cyclic stress-strain curves and strain-life curves. The peak tensile stress, the peak compression stress, the unloading elasticity moduli of tension and compression, and the area of the hysteresis loop in the LCF initial stage and finial stage were analyzed by comparison. The stress changes corresponding to LCF controlled by different strain amplitudes were discussed.

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