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Deposition of Phase-pure Cr2AlC Coating by DC Magnetron Sputtering and Post Annealing Using Cr-Al-C Targets with Controlled Elemental Composition but Different Phase Compositions

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Journal of Materials Science & Technology 2018年第3期34卷 466-471页

作者： Yueming Li Guorui Zhao yuhai qian Jingjun xu Meishuan Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100039China

Polycrystalline Cr2AlC coatings were prepared on M38G superalloy using a two-step method consisting of magnetron sputtering from Cr-Al-C composite targets at room temperature and subsequent annealing at 620 ℃. Particularly, various targets synthesized by hot pressing mixture of Cr, Al, and C powders at 650-1000 ℃ were used. It was found that regardless of the phase compositions and density of the com- posite targets, when the molar ratio of Cr：Al：C in the starting materials was 2：1：1, phase-pure crystalline Cr2AlC coatings were prepared by magnetron sputtering and post crystallization. The Cr2AIC coatings were dense and crack-free and had a duplex structure. The adhesion strength of the coating deposited on M38G superalloy from the 800 ℃ hot-pressed target and then annealed at 620 ℃ for 20 h in Ar exceeded 82 ± 6 MPa, while its hardness was 12 ± 3 GPa.

关键词： Cr2AlC Coating Magnetron sputtering Composite target Heat treatment

Suppressing the anomalous rapid oxidation of Ti_3AlC_2 by incorporating TiB_2

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Journal of Materials Science & Technology 2019年第3期35卷 432-439页

作者： Chao Li yuhai qian Chunlei Ma Shumin Wang Meishuan Li Light Industry College of Liaoning University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The oxidation behavior of Ti_3AlC_2-20 TiB_2 composite was studied at 500℃–900℃ in air. The composite showed a very low oxidation rate and followed a logarithmic oxidation law. The in-situ incorporation of TiB_2 suppressed the anomalous rapid oxidation of the substrate Ti_3AlC_2 occurred near 600℃ by forming a protective B_2O_3 glass layer, and also improved the oxidation resistance of the MAX phase at intermediatetemperature.

关键词： MAX phase Ti3AlC2-TiB2 composite Oxidation

Chemical Bath Co-deposited ZnS Film Prepared from Different Zinc Salts: ZnSO_4—Zn(CH_3COO)_2, Zn(NO_3)_2—Zn(CH_3COO)_2,or ZnSO_4—Zn(NO_3)_2

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Journal of Materials Science & Technology 2016年第3期32卷 207-217页

作者： Tingzhi Liu Yangyang Li Huan Ke yuhai qian Shuwang Duo Yanli Hong Xinyuan Sun Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

ZnSO4-Zn（CH3COO）2, Zn（NO3）2-Zn（CH3COO）2, ZnSO4-Zn（NO3）2, ZnSO4, Zn（NO3）2 or Zn（CH3COO）2 have been used as zinc sources to prepare ZnS thin films by chemical bath deposition and co-deposition methods. Zn（NO3）2 or/and Zn（CH3COO）2 is/are favorable for cluster by cluster deposition process while ZnSO4 favors ion by ion deposition process regardless of concentration ratios of ZnSO4. However, Zn（NO3）2 affects the nucleation density of ZnS nuclei on the substrate. ZnS thin films deposited from ZnSO4-Zn（CH3COO）2 are not only more homogeneous and compact, but also have higher growth rate and adhesion on to the glass substrate. The cubic ZnS films are obtained after only single deposition. The average transmission of films from S6, S7, S8, S9 and S1 for 2 and 2.5 h is greater than 85% in visible region. Compared with the film from S6 （112 nm）, the film from S7 is not only thicker （125 nm）, but also more transparent. The band gaps of the films deposited from S6,S7, S8, S9 and S1 for 2 and 2.5 h range from 3.88 to 3.98 eV. The effects of anions from different zinc salts are discussed in detail.

关键词： Thin film Chemical synthesis Electron microscopy Mechanical properties Optical properties

A Novel Deflection Method for Measuring the Growth Stress of Thermally Growing Oxide Scales

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Journal of Materials Science & Technology 2003年第3期19卷 231-234页

作者： yuhai qian MeishuanShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

A kind of new deflection technique has been developed for measuring the growth stress of thermally growing oxide scales during high temperature oxidation of alloys. The average growth stresses in oxide scales such as Al2O3, NiO and Cr2O3 formed on the surface of the superalloys can be investigated by this technique. Unlike the comventional deflection method, the novel method does not need to apply a coating for preventing one main face of thin strip specimen from oxidizing and can be used under the condition of longer time and higher temperature.

关键词： Oxide film Growth stress Deflection method

Microstructure and mechanical properties of short-carbon-fiber/Ti_(3)SiC_(2) composites

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Journal of Advanced Ceramics 2020年第6期9卷 716-725页

作者： Guangqi HE Rongxiu GUO Meishuan LI Yang YANG Linshan WANG yuhai qian Jun ZUO Jingjun XU Changsheng LIU School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China College of Science Northeastern UniversityShenyang 110819China

Short-carbon-fibers(C_(sf))reinforced Ti_(3)SiC_(2) matrix composites(C_(sf)/Ti_(3)SiC_(2),the C_(sf) content was 0 vol%,2 vol%,5 vol%,and 10 vol%)were fabricated by spark plasma sintering(SPS)using Ti_(3)SiC_(2) powders and C_(sf) as starting materials at 1300℃.The effects of C_(sf) addition on the phase compositions,microstructures,and mechanical properties(including hardness,flexural strength(σ_(f)),and KIC)of C_(sf)/Ti_(3)SiC_(2) composites were *** C_(sf),with bi-layered transition layers,i.e.,T_(IC) and SiC layers,were homogeneously distributed in the as-prepared C_(sf)/Ti_(3)SiC_(2) *** the increase of C_(sf) content,the K_(IC) of C_(sf)/Ti_(3)SiC_(2) composites increased,but the σ_(f) decreased,and the Vickers hardness decreased initially and then increased steadily when the C_(sf) content was higher than 2 vol%.These changed performances(hardness,σ_(f),and K_(IC))could be attributed to the introduction of C_(sf) and the formation of stronger interfacial phases.

关键词： Ti_(3)SiC_(2) short-carbon-fibers(C_(sf)) spark plasma sintering(SPS) microstructure mechanical properties

“Quartus scale” of hot-rolled strip steels and its formation mechanism

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Baosteel Technical Research 2007年第1期1卷 42-54页

作者： Huibin Qi yuhai qian Wei Wang Hua Zhang Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

The types and growth of various oxide scales formed during the different phases of the production of hotrolled strip steel products are reviewed. Similarities and differences between the ＂tertiary scale＂ on the surface of carbon steels at high temperatures and the oxide scale on pure iron are compared. The micro-structural features of the ＂final oxide scale＂ on the surface of strip steels at room temperature as well as the relationship between these features and the position of the steel coil （plate） and the subsequent processes of recoiling, temper rolling and trimming, etc. are summarized. The actual oxide scales retained on the commercial hot-rolled strip steels at room temperature have been proposed to define as ＂ quartus scale＂ for the first time. The micro-structural development and phase transformation of the initial ＂tertiary scale＂ during and after cooling and coiling are described. The reasons for the ＂tertiary scale＂ on carbon steels differing from the oxide scale formed on pure iron, and the major influencing factors in the formation of various types of ＂quartus scales＂ are analyzed from both thermodynamic and dynamic viewpoints. The development mechanism of ＂ quartus scales＂ is discussed and the potential effects of the ＂ quartus scale＂ state （thickness, constitution, structure and defects）, on the rusting and pickling properties of commercial hot-rolled strip steel, as well as on the mechanical properties of oxide scales are analyzed.

关键词： hot-rolled strip steel quartus scale microstructure oxidation phase transformation surface properties

Analysis of the quick corrosion of blast furnaces’gas pipes after the installation of dry-type de-dusting equipment and discussion about measures

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Baosteel Technical Research 2011年第4期5卷 60-64页

作者： YANG Zhen YANG qianyu DENG Wanli qian yuhai Energy and Environmental Protection Department Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200941 China High-performance Ceramics Division Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Compared with the traditional wet-type de-dusting technology ,the dry-type de-dusting technology is considered to be environmentally friendly and energy-saving. However, the pipes carrying the de-dusted blast fiLrnace gas （BFG） tends to be corrosive more quickly and seriously. In order to investigate the reasons for the quick corrosion, the gas pipes and auxiliary bellows installed in Baosteel＇ s newly built BFG dry-type de-dusting system are studied. The corrosive properties of the condensed water, such as the pH value, are measured and analyzed. Meanwhile, various factors that may influence the corrosion rate of the pipes are studied by experiment. On the basis of the investigation and research, the causes of corrosion and leakage on the pipes are discovered. It is the process of dry de-dusting that is responsible ,to a large extent, for the quick corrosion of the pipes. The equipment of spray tower is introduced and its effects are then discussed. This tower is designed to eliminate most of chloridion and neutralized the acid by spraying the alkaline water to the dedusted gas flow. The practical operation shows that the tower helps to lessen the corrosiveness of the dry de-dusted gas effectively. The last part of this study analyzes the possible impacts of the dry-type de-dusting process of the newly built blast furnace （BF） on the main BFG piping which has been in the state of being corroded for years by estimating its potential corrosion rate, and some suggestions on maintenance are given as well.

关键词： blast furnace gas (BFG) dry-type de-dusting technology gas piping corrosion

Mill scale structure and damp heat corrosion performance of four 510L hot-rolled strips

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Baosteel Technical Research 2011年第2期5卷 46-52页

作者： QI Huibin WANG Wei qian yuhai DONG Chaofang LI Xiaogang Welding ＆ Surface Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China

In this study, the matrix structure, state and composition of the mill scales of four typical domestically made 510L hot-rolled strips were observed and analyzed by means of optical microscopy （OM） ,scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The corrosion behavior of the steels with and without mill scales were investigated by means of hot-humid corrosion tests under the condition of relative humidity （ RH ） of 95% at 50℃ and 70℃, respectively. The results show that the matrix structures, state, composition and thickness of mill scales vary in the strips. The rusting starting time of the specimens with scales is generally a bit longer than that of the specimens without scales, but their corrosion mass-gain is higher. For these two kinds of specimens ,their corrosion rate increases significantly with the increase of temperature. The rusting behavior of the 510L strips produced by various plants is different due to the variations of hot-rolling processes and designed chemical compositions. Various relevant aspects should be taken into account in the evaluation of the corrosion behavior of hot-rolled strips.

关键词： 510L hot-rolled strip steel matrix structure scale structure corrosion behavior

Rusting behavior and preventative measures of hot-rolled steel plates for automobile applications

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Baosteel Technical Research 2009年第2期3卷 3-6页

作者： QI Huibin qian yuhai ZHANG Hua ZHOU Qingjun WANG Wei Welding ＆ Surface Technology Division Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

As one of the important categories of hot-rolled products, hot-rolled steel plates for automobile applications generally undergo uniform corrosion or localized corrosion according to different environments of manufacturing, transportation and/or storage of the plates. General corrosion often takes place on the surface of a plate in the exterior part of a package, and only reduces the thickness of the plate and slightly increases the roughness of the surface; however, localized corrosion on the surface of a plate inside the package is likely to result in the formation of pit-like defects on the substrate of the plate, which cannot be removed thoroughly by normal acid pickling or sand blasting, and affects the application of the plate. This research report analyzes the phenomena and characteristics of the rusting behavior of hot- rolled steel plates for automobile applications, and the influencing factors are summaried. The corresponding preventative measures are proposed.

关键词： hot-rolled steel plates for automobile applications rusting pit-like defects preventative measures