Microstructure and Properties of 2Cr13-xMo Stainless Steels Fabricated by Direct Laser Deposition

Jing Liang,Ziyang Lin,Xiuyuan Yin,Suiyuan Chen,Changsheng Liu,Ruihong Chai,Hongwei Zhang,Guangquan Tang,Kun Tian 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1

In this paper, 2Cr13 stainless steels with diferent Mo contents (x=0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%) were fabricated by Direct Laser Deposition (DLD) technology. The efects of Mo element on the microstructure evolution and comprehensive properties such as corrosion resistance and wear resistance of 2Cr13 stainless steel were investigated in detail. The results showed that the microstructure for the DLD 2Cr13 stainless steel was mainly composed of martensite, ferrite,and a small amount of Mo2C and Cr23C6 carbides. With the content of Mo increased from 0.5 to 1.5 wt%, the martensiticmicrostructure was refned and more dispersed Mo2C and Cr23C6 carbides were formed. The average microhardness andcorrosion resistance of the DLD 2Cr13-xMo were increased with the Mo content increased from 0 to 1.0 wt%, and thendecreased when the Mo content exceeded 1.0 wt%. For the DLD 2Cr13-1.0 wt% Mo, the average microhardness reachedup to 620 HV0.2, and the highest corrosion resistance (self-corrosion potential − 0.34 V) was obtained, in which the selfcorrosion potential was 0.05 higher than that of DLD 2Cr13 stainless steel. The wear resistance of the DLD 2Cr13-xMogradually increased with the increase of the Mo, the wear mass loss of DLD 2Cr13-xMo (x=1.0 wt%) was only 37% thatof DLD 2Cr13 stainless steel.

Verification of MacAdam Data

Jing Liang,Ming Ronnier Luo,Maria Georgoula,Nianyu Zou 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10

MacAdam data have been well known in the colour-difference research field. It has been used for defining the tolerance for the white lights in the lighting industry. This paper describes two separate experiments carried out at Leeds university (UK) and Zhejiang university (China) respectively. Both experiments were conducted to assess colour-differences using Eizo displays using the ratio method. Each centre included 21 samples assessed against a grey and a black background, respectively. The difference between the two experiments are the sample pair used. Leeds university had all samples selected from CIE u’v’ chromaticity diagram and Zhejiang university selected from CIELAB space. These data were used to test colour difference equations and colour spaces. The result should that both present datasets disagreed with MacAdam data greatly.

Effect of In-Situ Ti2N on Microstructure and Properties of SAF2906 Duplex Stainless Steel Fabricated by Laser Melting Deposition

Jing Liang,Sheng Yang,Ye Liu,Xiuyuan Yin,Suiyuan Chen,Changsheng Liu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7

SAF2906 Duplex Stainless Steel (DSS) was fabricated by powder prepasted Laser Melting Deposition(LMD). The formationof ferrite was promoted by increasing the molybdenum content. The volume ratio of ferrite and austenite of LMDed SAF2906DSS with 3 wt% molybdenum content reached 4:6. The effects of 2 wt% and 4 wt% nano TiN addition on the microstructureand comprehensive properties of LMDed SAF2906 DSS were investigated in detail. The results showed that in-situ generatednano (10 nm ~ 100 nm) and submicron (100 nm ~ 1 μm) Ti2Nparticles were uniformly distributed in the LMDed SAF2906DSS matrix, and some nano Ti2Nparticles preferred to be distributed among grain boundaries. The primary and secondarydendrite spacing of austenite of LMDed SAF2906 with 4wt% TiN addition decreased by 48% and 62%, respectively, whilethe austenite content increased by 15%. The wear resistance, strength, elongation and corrosion resistance of the LMDedSAF2906 were gradually improved with the increase of nano TiN addition from 0 to 4 wt%. The average microhardnessfor the sample with 4 wt% nano TiN addition (381 HV0.2)was 1.2 times that of the sample without TiN (326 HV0.2),whilethe wear rate (9.12 × 10–13 m3/Nm) was only 71% that of the sample without TiN (1.28 × 10–12 m3/Nm). The yield strength,tensile strength and elongation of the LMDed SAF2906 with 4wt% TiN addition increased to 801 MPa, 1028 MPa and31.8%, respectively. The self-corrosion potential increased to 0.0216 V, and the self-corrosion current density also reached4.57 × 10–7 A·cm−2 for LMDed SAF2906 with 4wt% TiN addition.

A Study on Thermoelectric Converter Using DMFC (Direct Methanol Fuel Cell) System

장경량(Zhang Jingliang),문채주(Moon Chaejoo),장영학(Chang Younghak),정의헌(Cheang Euiheang),김태곤(Kim Taegon) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11

This article describes a thermoelectric converter, which is powered by thermoelectric (TE) power modules. This system uses TE devices that directly convert heat energy to electricity to power a converter using direct methanol fuel cell (DMFC) system. The characteristics of the TE module were tested at different temperatures. A boost DC-DC converter was designed and controlled by a power-supply controller chip. Efficiency of about 80% can be achieved and because the thermoelectric converter system has not moving parts and has a small volume, the system can be carried about easily and conveniently to supply portable electric equipment and this is very important for some mobile equipment.

The Impact of the Canada-Korea Free Trade Agreement as Negotiated

Dan Ciuriak,Jingliang Xiao 대외경제정책연구원 2014 East Asian Economic Review Vol.18 No.4

This paper analyzes the impact of the Canada-Korea Free Trade Agreement on the basis of the published text and agreed schedule of commitments. We find that the Agreement reinforces existing patterns of comparative advantage between Canada (agriculture and resource-based sectors) and Korea (autos and other industries). The sensitive sectors that held up the deal for years – autos into Canada and beef into Korea – witness major trade gains, but are not unduly disrupted. In both economies, the major output gains otherwise come in non-traded services sectors, driven by income effects. We find that trade diversion effects are quite significant; this lends support for the domino theory of major free trade agreements – since the Korea-EU agreement broke the ice, the pressure has intensified on third parties to re-level playing fields by striking their own deals. The study breaks new ground in modelling services trade by developing policy impacts based on the extent to which the text of the Agreement modifies Korea’s and Canada’s scores on the OECD’s Services Trade Restrictiveness Index and by providing estimates of Mode 3 Services trade impacts. The analysis of the Agreement as negotiated, the present study, in our view, is a step forward in understanding the impact of modern free trade agreements.

Quantifying the Comprehensive and Progressive Agreement for Trans-Pacific Partnership

Dan Ciuriak,Jingliang Xiao,Ali Dadkhah 대외경제정책연구원 2017 East Asian Economic Review Vol.21 No.4

We assess the outcomes for the negotiating parties in the Trans-Pacific Partnership if the remaining eleven parties go ahead with the agreement as negotiated without the United States, as compared to the outcomes under the original twelve-member agreement signed in October 2016. We find that the eleven-party agreement, now renamed as the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), is a much smaller deal than the twelve-party one, but that some parties do better without the United States in the deal, in particular those in the Western Hemisphere – Canada, Mexico, Chile, and Peru. For the politically relevant medium term, the United States stands to be less well-off outside the TPP than inside. Since provisional deals can be in place for a long time, the results of this study suggest that the eleven parties are better off to implement the CPTPP, leaving aside the controversial governance elements, the implications of which for national interests are unclear and which, in any event, may be substantially affected by parallel bilateral negotiations between individual CPTPP parties and the United States.

Studies on the electrochemical degradation of Acid Orange II wastewater with cathodes modified by quinones

Lin Yue,Jianbo Guo,Jingliang Yang,Jing Lian,Xiao Luo,Xiangning Wang,Kaihong Wang,Li Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3

The electrochemical oxidation of dye wastewater with the cathode modified by quinones has beeninvestigated. Under the optimal conditions, the decolorization efficiency can reach 96.0% after 120 min. The addition of tert-butanol significantly decreased the decolorization efficiency, suggesting theinvolvement of -OH radicals in the decomposition of H2O2. A potential difference may result in a quinoneradical on the cathode which can catalyze the reduction of O2 to H2O2. UV–vis spectrum and GC/MSanalysis revealed that the dye molecule was firstly initiated by the cleavage of –N55N–, and decomposedto aromatic intermediates, further degraded to ring opening products and finally mineralized.

Achievable Rate of Beamforming Dual-hop Multi-antenna Relay Network in the Presence of a Jammer

( Guiguo Feng ),( Wangmei Guo ),( Jingliang Gao ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.8

This paper studies a multi-antenna wireless relay network in the presence of a jammer. In this network, the source node transmits signals to the destination node through a multi-antenna relay node which adopts the amplify-and-forward scheme, and the jammer attempts to inject additive signals on all antennas of the relay node. With the linear beamforming scheme at the relay node, this network can be modeled as an equivalent Gaussian arbitrarily varying channel (GAVC). Based on this observation, we deduce the mathematical closed-forms of the capacities for two special cases and the suboptimal achievable rate for the general case, respectively. To reduce complexity, we further propose an optimal structure of the beamforming matrix. In addition, we present a second order cone programming (SOCP)-based algorithm to efficiently compute the optimal beamforming matrix so as to maximize the transmission rate between the source and the destination when the perfect channel state information (CSI) is available. Our numerical simulations show significant improvements of our propose scheme over other baseline ones.

Thoughts Regarding the Soft Environment for Building Shanghai into an International Shipping Centre

Yu-Shicheng,Sun-Jingliang 대한교통학회 1996 대한교통학회 기타자료 Vol.1996 No.-

2019 Novel Coronavirus (COVID-19) Pneumonia: Serial Computed Tomography Findings

Jiangping Wei,Huaxiang Xu,Jingliang Xiong,Qinglin Shen,Bing Fan,Chenglong Ye,Wentao Dong,Fangfang Hu 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.4

From December 2019, Coronavirus disease 2019 (COVID-19) pneumonia (formerly known as the 2019 novel Coronavirus [2019nCoV]) broke out in Wuhan, China. In this study, we present serial CT findings in a 40-year-old female patient with COVID-19 pneumonia who presented with the symptoms of fever, chest tightness, and fatigue. She was diagnosed with COVID-19 infection confirmed by real-time reverse-transcriptase-polymerase chain reaction. CT showed rapidly progressing peripheral consolidations and ground-glass opacities in both lungs. After treatment, the lesions were shown to be almost absorbed leaving the fibrous lesions.