State Nuclear Bao Ti Zirconium Industry Company

Guozhen, China

State Nuclear Bao Ti Zirconium Industry Company

Guozhen, China
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Liang N.,Shanghai University | Zhang J.,Shanghai University | Yuan G.,State Nuclear Bao Ti Zirconium Industry Company | Wang L.,State Nuclear Bao Ti Zirconium Industry Company | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2017

The corrosion resistance of Zr-0.8Sn-0.25Nb-0.35Fe-0.1Cr-0.05Ge alloy treated by different annealing processes was studied in 400℃/10.3 MPa super-heated steam by autoclave tests. The microstructure of the samples was investigated by TEM/EDS and SEM. The results show that partial recrystallization occurs in the samples annealed at 500℃, and the effect of annealing time on the size of second phase particles (SPPs) is not obvious; while complete recrystallization occurs in the samples annealed at 580℃; with the prolongation of annealing time, the SPPs are enlarged in the alloy. There exist Zr(Nb,Fe,Cr)2 SPPs with a hexagonal close packed structure, tetragonal Zr3Ge and orthogonal Zr3Fe SPPs. The corrosion resistance of Zr-0.8Sn-0.25Nb-0.35Fe-0.1Cr-0.05Ge alloy in 400℃/10.3 MPa super-heated steam is improved with the prolongation of annealing time and increase of annealing temperature. © 2017, Science Press. All right reserved.


Zhang J.-L.,Shanghai University | Zhang J.,Shanghai University | Liang N.,Shanghai University | Zeng Q.-F.,Shanghai Nuclear Engineering Research and Design Institute | And 5 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2017

Varies annealing temperature and annealing time (500~580 ℃, 5~50 h) were conducted to SZA-6 (Zr-(0.35-0.65)Sn-(0.35-0.65)Nb-(0.15-0.45)Fe-(0.01-0.02)Si) alloy, the effects of annealing treatments on the corrosion resistance of zirconium alloy were investigated. The annealing samples were corroded in lithiated water with 0.01 mol/L LiOH at (360 ℃, 18.6 MPa), as well as superheated steam at (400 ℃, 10.3 MPa). The microstructures of the samples were examined by SEM, TEM and EDS. The results show that samples annealed at 500 ℃ are in a partial recrystallization state and samples annealed at 580 ℃ are in a complete recrystallization state. Annealing time shows no obvious effect on the size of second phase particles(SPPs) in both samples. Hexagonal close packed Zr(Nb,Fe,Cr)2 SPPs, tetragonal Zr5Si4 and orthogonal Zr3Fe SPPs are observed in the matrix of the alloy. The corrosion resistance of SZA-6 alloy decreases with the increase of annealing temperature and is insensitive to the annealing time in the both water chemistries. Annealing time shows no obvious effect on the corrosion resistance of SZA-6 alloy. © 2017, Science Press. All right reserved.


Zeng Q.,Shanghai Nuclear Engineering Research and Design Institute | Zhu L.,Shanghai Nuclear Engineering Research and Design Institute | Yuan G.,State Nuclear Baoti Zirconium Industry Company | Wang L.,State Nuclear Baoti Zirconium Industry Company | And 2 more authors.
He Jishu/Nuclear Techniques | Year: 2017

Background: Zirconium alloys are widely used as cladding tube and structural materials in pressurized water reactors because of their low thermal neutron cross section, good mechanical properties and corrosion resistance. At present, the main problem in the development of domestic zirconium alloys is the development of new zirconium alloys with independent intellectual property rights, and improving the corrosion resistance and hydrogen pick-up behaviors of zirconium alloys, making them significantly better than Zr-4 alloy, at the same time, keeping comparable mechanical properties, radiation growth and creep resistance with Zr-4 alloy. Purpose: Therefore, a series of various model zirconium alloys were prepared by vacuum arc smelting based on Zr-Sn-Nb alloy with minor alloying elements such as Ge and Si, in order to select the most promising candidate alloys to meet these requirements, via comparative studies on the corrosion resistance, hydrogen pick-up behaviors and mechanical properties. Methods: Transmission electron microscopy (TEM) was used to characterize the detail microstructure of base alloys. Corrosion resistance was examined by the weight gain in static autoclave with different water chemistry environments. Hydrogen pick-up behaviors were directly reflected by the hydrogen contents across the oxidation layers and underneath matrix measured by hydrogen determinator. The mechanical properties were evaluated by conventional tensile testing. Results: It was found that SZA-6 and SZA-4 alloys consisted of fully recrystallized grain structures with uniformly distributed fine second phase particles located within grain interior and at grain boundaries. Both SZA-4 and SZA-6 alloys exhibited excellent corrosion resistance in all three water chemistry conditions. The corrosion resistance of SZA-6 was better than the reference commercial alloys, and SZA-4 was slightly better than SZA-6. However, the SZA-6 alloy seemed to be less susceptible to hydrogen pick-up compared to SZA-4 alloy. In addition, the mechanical properties of two new zirconium alloys met the design criterion. Conclusion: Considering the outstanding corrosion resistance and low hydrogen pick-up in simulated water chemistry conditions and satisfied mechanical performances, the SZA-4 and SZA-6 alloys were suggested as promising alloys used for CAP1400 fuel assembly in the future. © 2017, Science Press. All right reserved.


Zhao X.-S.,General Research Institute for Nonferrous Metals, China | Yuan G.-H.,State Nuclear BAOTI Zirconium Industry Company | Yao M.-Y.,Shanghai University | Yue Q.,State Nuclear BAOTI Zirconium Industry Company | Shen J.-Y.,General Research Institute for Nonferrous Metals, China
Calphad: Computer Coupling of Phase Diagrams and Thermochemistry | Year: 2012

A thermodynamic model of the VZr binary system is established by CALPHAD approach combined with first-principles calculations. The predicted Gibbs free energies of the compound V 2Zr and other end-members in the sublattice model for the V 2Zr phase by the first-principles calculations are used to describe the lattice stabilities of this phase. A set of model parameters for the VZr system is obtained via thermodynamic optimization by using the PARROT module in Thermo-Calc software. The calculated phase diagram agrees well with the reported experimental data. © 2011 Elsevier Ltd. All rights reserved.


Yuan G.,University of Bolton | Zhang L.,CAS Shenyang Institute of Metal Research | Yue Q.,State Nuclear Bao Ti Zirconium Industry Company | Gu H.,CAS Shenyang Institute of Metal Research | And 2 more authors.
Materials Chemistry and Physics | Year: 2015

The β phase precipitates in a Zr-1Nb alloy annealed at 600°C and 700°C (below and above the monotectoid temperature, respectively) for 3h were investigated by transmission electron microscopy. It was found that the uniformly distributed β phase obtained at 600°C was spherical, with diameter of 30-60nm, volume fraction of ~2.5% and Nb content of ~68wt.%. However, the β phase obtained at 700°C was stick-shaped, with ~100nm in diameter and ~300nm in length, volume fraction of ~9.8% and Nb content ~10wt.%. The distinctions in volume fractions and compositions were consistent with the lever rule of the Zr-Nb phase diagram. The distinction in shapes resulted from the change in the interfacial structure, which depended on the lattice misfit. The orientation relationship between α matrix and stick-shape β precipitates satisfied Burgers' orientation relationship, i.e., (101- 0)α//(11- 2)β for the broad face, (0001)α//(110)β for the side facet and (112- 0)α//(1-11)β for the edge. The outline of the stick-shaped β precipitates was composed of straight and curved interfaces, and the broad faces and side facets together formed the straight interface, and the edges formed the curved one. As the Nb content of β phase increased, the lattice misfits on broad face and side facet increased and their interfacial structures changed from coherent (obtained at 700°C) into incoherent (obtained at 600°C), and the misfits of edge decreased, and their interfacial structures were always incoherent for the two heat treatments. Therefore, the curved interfaces had a higher growth rate than the straight interfaces at 700°C and stick-like β phase precipitate was formed. While the three planes have a comparable growth rate at 600°C and spherical β phase precipitate was formed. © 2015 Elsevier B.V.


Yuan G.,University of Bolton | Yuan G.,State Nuclear Bao Ti Zirconium Industry Company | Zhang L.,CAS Shenyang Institute of Metal Research | Yue Q.,State Nuclear Bao Ti Zirconium Industry Company | And 3 more authors.
Materials Chemistry and Physics | Year: 2015

The β phase precipitates in a Zr-1Nb alloy annealed at 600 C and 700 C (below and above the monotectoid temperature, respectively) for 3 h were investigated by transmission electron microscopy. It was found that the uniformly distributed β phase obtained at 600 C was spherical, with diameter of 30-60 nm, volume fraction of ∼2.5% and Nb content of ∼68 wt.%. However, the β phase obtained at 700 C was stick-shaped, with ∼100 nm in diameter and ∼300 nm in length, volume fraction of ∼9.8% and Nb content ∼10 wt.%. The distinctions in volume fractions and compositions were consistent with the lever rule of the Zr-Nb phase diagram. The distinction in shapes resulted from the change in the interfacial structure, which depended on the lattice misfit. The orientation relationship between α matrix and stick-shape β precipitates satisfied Burgers' orientation relationship, i.e., (101¯ 0)α//(11¯ 2)β for the broad face, (0001)α//(110)β for the side facet and (112¯ 0)α//(1¯11)β for the edge. The outline of the stick-shaped β precipitates was composed of straight and curved interfaces, and the broad faces and side facets together formed the straight interface, and the edges formed the curved one. As the Nb content of β phase increased, the lattice misfits on broad face and side facet increased and their interfacial structures changed from coherent (obtained at 700 C) into incoherent (obtained at 600 C), and the misfits of edge decreased, and their interfacial structures were always incoherent for the two heat treatments. Therefore, the curved interfaces had a higher growth rate than the straight interfaces at 700 C and stick-like β phase precipitate was formed. While the three planes have a comparable growth rate at 600 C and spherical β phase precipitate was formed. © 2015 Elsevier B.V. All rights reserved.


Yu J.,State Nuclear BaoTi Zirconium Industry Company | Li X.,State Nuclear BaoTi Zirconium Industry Company | Zhai Y.,State Nuclear BaoTi Zirconium Industry Company | Ren Y.,State Nuclear BaoTi Zirconium Industry Company | Li Y.,China Nuclear Power Engineering Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

Back-Propagation artificial neural network (BP ANN) module with Trainrp algorithm was used to predict annealing parameter and hardness of HANA-4(Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr) and HANA-6(Zr-1.1Nb-0.05Cu). In this module, chemical compositions, annealing temperature and annealing time were employed as input units while hardness was employed as output unit. The optimal network architecture was considered to be 3-7-1 with momentum factor and learning rate all chosen to be 0.6, respectively. The result of ANN module shows that the biggest relative error (RE) is 7%, and the correlation coefficients (R-value) is 0.98534. The result strongly indicates that the ANN model is an efficient tool to provide annealing parameter. Moreover, Sensitivity analysis (SA) shows that annealing temperature and annealing time are the most important parameters to the ANN model accuracy, the effect of chemical compositions is very small. Copyright © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Yang Y.,Chongqing University | Huang Y.,Chongqing University | Zhang M.,State nuclear baoti zirconium industry company | Wei H.,Chongqing University
Advanced Materials Research | Year: 2012

This paper used BP(Neural Networks) to establish parameter optimization design method for Zr-4 clad tube belt grinding. The BP can get strong nonlinear mapping capability through training, obtain better grinding parameter model; GA(Genetic Algorithm) is not dependent on the specific situation of the problem and it has strong robustness, so it can provides optimization framework for Zr-4 clad tube belt grinding parameter optimization design of nonlinear optimization. This paper optimized the single objective and multi-objective of the abrasive belt life n and grinding roughness Rz, obtained satisfied optimization results and the corresponding grinding conditions © (2012) Trans Tech Publications, Switzerland.


Qiao K.,Xi'an University of Architecture and Technology | Wang W.,Xi'an University of Architecture and Technology | Wu N.,State Nuclear Bao Ti Zirconium Industry Company | Li T.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Al/Cu clad plates were joined by friction stir welded (FSW) and the effect of welded speed on mechanical properties and microstructure of nugget zone was investigated. The results show that the distribution of aluminum and copper in weld area presents a laminate character, and the grain size in this zone decreases with the increase of the welded speed. The average microhardness of Cu layer in the nugget zone is 88 HV0.2 accounting for 71.06% of basal metal at the welded speed of 95 mm/min. The average microhardness of the Al layer exceeds the as-received metal to 35 HV0.2 and the tensile strength is 115.22 MPa in the nugget zone when the welded speed is 47.5 mm/min. With the increase of welded speed, tensile strength and elongation decrease, and the fracture surface of tensile specimen is characterized by a cleavage fracture. © 2016, Editorial Office of "Jinshu Rechuli". All right reserved.


Ma L.,State Nuclear Baoti Zirconium Industry Company | Ma L.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Yue Q.,State Nuclear Baoti Zirconium Industry Company | Peng S.,State Nuclear Baoti Zirconium Industry Company
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2014

Taking three typical zirconium alloys Zr-4, M5 and Zirlo respectively in Zr-Sn, Zr-Nb and Zr-Sn-Nb series as objects of study, systematic comparison and analysis were performed to the difference among these alloys in the aspect of second phase particles, mechanical properties, hydride orientation and corrosion resistance, etc., while an evaluation was carried out to their application status. On the basis of current analysis, it is suggested that the material design method should be used in the development of new zirconium alloys with high properties.

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