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Ji D.,Luoyang Ship Material Research Institute | Liu C.,Central South University | Tang L.,Central South University | Wan Y.,Central South University | Huang C.,Central South University
Materials and Design | Year: 2014

The microstructure, texture and mechanical properties of the as-extruded Mg-4.45Zn-0.46Y-0.76Zr (ZWK401) alloy plate were investigated on specimens with the extrusion direction (ED), 45° direction and the transverse direction (TD), respectively. The as-extruded alloy showed a mixed grain structure composed of long elongated unrecrystallized grains (LEGs) which contained both stringer LEGs and elliptical LEGs, fine equiaxed recrystallized grains (FEGs) and peculiarly arranged equiaxed grains referred as row stacked grains (RSGs). The texture in the as-extruded ZWK401 alloy plate was formed by six components: {112-0}〈101-0〉, {112-0}〈101-3〉, {112-0}〈0001〉, {101-0}〈112-0〉, {101-0}〈0001〉 and {0001}〈101-0〉. In particular, the predominance of a {112-0}〈101-0〉 texture strongly affects twinning and slipping behavior, thus affects the mechanical anisotropy. The ZWK401 alloy plate showed excellent mechanical properties in the ED sample with the UTS of 331. MPa, YS of 278. MPa and elongation to failure of 12.3%. © 2013 Elsevier Ltd. Source

Zhang W.Y.,Luoyang Ship Material Research Institute
Applied Mechanics and Materials | Year: 2010

The virtual manufacturing technology is one of advanced techniques of manufacture which appears in recent years, is the enterprise taking the information integration as the foundation one kind of new manufacture philosophy. This article on virtual aspects and so on technique of manufacture definition, research content, characteristic, domestic and foreign virtual manufacturing technology application and development, virtual manufacturing technology development forecast has carried on the summary, hoped has the understanding to the virtual manufacturing technology, has the contribution to its development. © (2010) Trans Tech Publications. Source

Zhang Y.-J.,Luoyang Ship Material Research Institute
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

Low cycle fatigue characteristics of 10CrNiMo high-strength steel were investigated with smooth rotundity-section specimens through low cycle fatigue testing under axial loading controlled by different strain amplitudes, including cyclic stress-strain behavior, strain-life feature, cyclic stress response and mechanical hysteresis. The relevant fatigue parameters, cyclic softening/hardening property and strain hysteretic rule were given on the basis of experimental data. Observations of crack propagation orientation and fracture surfaces show that fatigue cracks initiate with multi-initiation sites from the specimen surface, distribute along the fracture border, and propagate along planes with different angles to axial force. Fatigue crack propagation is mainly in the blunting-resharpening mechanism. Source

Liu P.,Luoyang Ship Material Research Institute
Yejin Fenxi/Metallurgical Analysis | Year: 2016

Based on top-down technology, an evaluation method of measurement uncertainty of laboratory quality control data was proposed by standard deviation which was defined using grey system theory (abbreviated as quality control-grey evaluation method, QC-Grey evaluation method). The feasibility and accuracy of method was verified using 45 groups (35 testing items) of quality control data in metallurgical analysis, environmental monitoring (water quality detection), biological detection and physical measurement. The ratio of evaluation results between proposed method and quality control charting(the current standard method) and robust statistics-iteration method (algorithm 1 and algorithm 2) was SGrey/SMR=1.00±0.13, SGrey/Srs1=0.96±0.05 and SGrey/Srs2=1.00±0.08, respectively. The consistency among methods was good. The QC-Grey evaluation method had little dependence to the distribution type of quality control data. The complicated normality test was not required. Therefore, the evaluation process was more simple and practical. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved. Source

Liu G.,Harbin Institute of Technology | Liu G.,Luoyang Ship Material Research Institute | Tang S.,Harbin Institute of Technology | Li D.,Jiamusi University | Hu J.,Harbin Institute of Technology
Corrosion Science | Year: 2014

A calcium phosphate (Ca-Ph) coating was prepared on micro-arc oxidized magnesium using deposition method. The microstructure of the Ca-Ph coated sample and corrosion behaviour in simulated body fluid (SBF) were investigated. The results showed that the coating consisted of hydroxyapatite (HA) and dicalcium phosphate dihydrate (DCPD). Temperature significantly affected the microstructure of the coating. Increased temperature promoted HA formation but inhibited DCPD deposition. The microstructure of the Ca-Ph coating underwent self-adjustment in SBF. Bonelike apatites were formed on the coated sample, which not only increased the thickness of coating, but also improved corrosion performance of the coated sample in SBF. © 2013 Elsevier Ltd. Source

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