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OBSERVATION ON MICROSTRUCTURE OF LASER MELTED TRANSITION ZONE

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Acta Metallurgica Sinica(English Letters) 1990年第4期3卷 293-296页

作者： CHENG Yongxing LI Genfu YU Shaoluo shanghai university of engineering science,shanghai,China Dept.No.5,shanghai university of engineering science,shanghai 200051,China

The surface alloying specimen was made from the steel 45 substrate overcoating by oxygen-acetylene flame spraying Fe-Cr-Ni alloy powder and laser *** chemical heterogeneity was clearly observed on the transition zone between the laser melted zone and heat-affected zone by means of EPMA,AES and *** heterogeneity is rather serious during high temperature tempering,so the decarburization on the transition zone side and the recarburization on the melted zone side were found.

关键词： laser alloying heterogenity transition zone microstructure

Surface temperature field survey for laser heating of steels

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Chinese Journal of Lasers 1994年第4期B3卷 363-368页

作者： ZHU Zuchang LI Xiuqian YU Shaoluo(shanghai university of engineering science,shanghai 200335, China) shanghai univ of engineering science Shanghai China

Ｓｕｒｆａｃｅｔｅｍｐｅｒａｔｕｒｅｆｉｅｌｄｓｕｒｖｅｙｆｏｒｌａｓｅｒｈｅａｔｉｎｇｏｆｓｔｅｅｌｓ￥ＺＨＵＺｕｃｈａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＥｎｇｉ... 详细信息

Ｓｕｒｆａｃｅｔｅｍｐｅｒａｔｕｒｅｆｉｅｌｄｓｕｒｖｅｙｆｏｒｌａｓｅｒｈｅａｔｉｎｇｏｆｓｔｅｅｌｓ￥ＺＨＵＺｕｃｈａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＥｎｇｉｎｅｅｒｉｎｇＳｃｉｅｎｃｅ，Ｓｈ...

关键词： laser processing infrared irradiation temperature measurement heat Treatment

Nondestructive test of weld residual stresses by acoustoelastic technique

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China Welding 1994年第1期3卷 45-52页

作者： Jiao Fujie Zhang Wenjun and Yuan Zhikang (shanghai university of engineering science)

The fundamentals of acoustoelastic theory and the principle of acoustoelastic nondestructive stress analysis related ultrasonic test Instrument for weld residual stresses are described. The weld residual stress distribution in butt-welded joints was measured by the acoustoelastic stress analysis, which uses the pulse echo overlap method to measure the speed difference in ultrasonic shear waves polarized in principal directions, and a new method of evaluating the material anisotropy is proposed. The results indicate that the anisotropic coefficient of the welded metal is much greater than that of the parent metal. the longitudinal residual stress distributions measured by the acoustoelastic technique are coincident with those obtained by the theoretical analysis, and the measuring accuracy is much greater than that obtained by the resistance strain gauge.

关键词： acoustoelasticity weld residual stress ultrasonic measurement

The Hardness Properties of Carbon Steels After Laser Processing

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Chinese Journal of Lasers 1994年第1期B3卷 91-95页

作者： ZHU Zuchang WANG Weixiang LI Xiuqian YU Shaoluo(shanghai university of engineering science,shanghai 200335, China) shanghai Univ of engineering science Shanghai China

ＴｈｅＨａｒｄｎｅｓｓＰｒｏｐｅｒｔｉｅｓｏｆＣａｒｂｏｎＳｔｅｅｌｓＡｆｔｅｒＬａｓｅｒＰｒｏｃｅｓｓｉｎｇ￥ＺＨＵＺｕｃｈａｎｇ；ＷＡＮＧＷｅｉｘｉａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（Ｓｈａｎｇｈａｉ... 详细信息

ＴｈｅＨａｒｄｎｅｓｓＰｒｏｐｅｒｔｉｅｓｏｆＣａｒｂｏｎＳｔｅｅｌｓＡｆｔｅｒＬａｓｅｒＰｒｏｃｅｓｓｉｎｇ￥ＺＨＵＺｕｃｈａｎｇ；ＷＡＮＧＷｅｉｘｉａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＥｎｇｉｎ...

关键词： laser processing heat treatment property

(Ⅰ+Ⅱ)MIXED MODE HYDROGEN INDUCED CRACKING

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Acta Metallurgica Sinica(English Letters) 1989年第4期2卷 279-283页

作者： GAO Hua XUE Lijue shanghai university of engineering science,shanghai,China Associate Professor,Dept.of Materials,shanghai university of engineering science,350 Xianxia Road,shanghai,China

Hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading ***- ter being hydrogen-charged in IN H_2SO_4 solution,the material behaved hydrogen embrittlement in all the cases *** threshold K_(ⅡH)/K_(ⅡX) of HIC under mode Ⅱ load- ing was 0.27,which was nearly the same as that K(ⅠH)/K_(ⅠX)=0.29 under mode Ⅰ loading. While the thresholds of-HIC under(Ⅰ+Ⅱ)mixed mode loading were 0.36,0.41 and 0.37 cor- responding to the K_Ⅱ/K_Ⅰ ratio of 0.27,0.4 and *** results show that simple mode Ⅰ or mode Ⅱ loading is more susceptible to hydrogen embrittlement than(Ⅰ+Ⅱ)mixed mode. For explaining the experimental results,the effects of triaxial stress as well as plastic deformation ahead of crack tip has been discussed.

关键词： (Ⅰ+Ⅱ)mixed mode hydrogen induced cracking

EFFECT OF NON-PROPORTIONAL OVERLOADING ON FATIGUE CRACK GROWTH

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Acta Metallurgica Sinica(English Letters) 1991年第1期4卷 59-64页

作者： GAO Hua CHEN Youxuan LI Ming shanghai university of engineering science,shanghai,ChinaCHEN Dehai shanghai Dalong Machinery,shanghai,China Associate Professor,Dept.of Materials,shanghai university of engineering science,shanghai 200051,China

The effect of proportional and non-proportional overloading on mode l fatigue crack growth have been studied,and the influences of crack tip plastic zone,crack tip blunting as well as crack closure were ***(model I)overloading may cause more serious crack growth retardation than non-proportional(mixed mode)***,for estimating the fatigue life of engineering structures to simplify a real overload which may of- ten be non-proportional as a proportional one is not always safe.

关键词： non-proportional overloading fatigue crack growth mixed mode loading

MIXED MODE SCC OF 18-8 STAINLESS STEEL IN BOILING 42% MgCl_2 SOLUTION

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Acta Metallurgica Sinica(English Letters) 1992年第8期5卷 104-109页

作者： GAO Hua CAO Weijie ZHOU Deqi WANG Ruizhen shanghai university of engineering science,shanghai,China

A series of mixed mode tests were carried out on 18-8 stainless steel in boiling 42% MgCl_2 *** results show that for any K_Ⅱ/K_Ⅰ ratio,the SCC direction coin- cides well with the crack tip maximum normal stress plane,while the SCC resistance of the material reduces as the ratio of K_Ⅱ/K_Ⅰ *** experimental results were discussed in the light of anode dissolving mechanism and the effect of mixed mode loading on crack tip stress and *** is concluded that for fracture analysis if mixed mode cracks were simply taken into account as mode Ⅰ cracks,and only mode Ⅰ testing results as mode Ⅰ fracture criter- ion were employed,it may not be safe.

关键词： 18-8 stainless steel stress corrosion mixed mode

Microstructure and properties of in situ synthesized TiB_2+WC reinforced composite coatings

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Rare Metals 2008年第5期27卷 451-456页

作者： LI Jun ZHANG Huiying LI Wenge ZHANG Guangjun School of Materials engineering Shanghai University of Engineering Science Shanghai 201620 China

Nickel-based composite coatings reinforced by in situ synthesized TiB2 and WC particles were deposited on stainless steel by laser cladding, and their microstmcture and mechanical properties were investigated. The results show that the coatings are mainly composed of 7-Ni cellular dendrites and dispersed spherical/strip/network shaped TiB2 and equiaxial WC particles. The initial WC particles are dissolved to become fine and mostly dispersed within Y-Ni cellular dendrites. The coating prepared at a special laser energy of 0.225 kJ@mm^-2 is uniform, continuous, and free of pores and cracks. With the decrease in special energy density, TiB2 phase changes from fine spherical particles which cluster together to strip shape with different morphologies and further crystallizes to form network structure, and the dispersion zone also gradually changes from intragranular to intergranular phase. The coating possesses a higher microhardness compared with the substrate, and it has a good metallurgical bond with the substrate and excellent cracking resistance.

关键词： laser cladding in situ synthesis composite coating microstructure

Ordered Mesoporous Carbon/SnO_2 Composites as the Electrode Material for Supercapacitors

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Journal of Wuhan university of Technology(Materials science) 2011年第3期26卷 407-411页

作者：刘萍徐菁利 College of Chemistry and Chemical engineering Shanghai University of Engineering Science

A series of composites as electrode materials for supercapacitors were prepared via incipient wetness impregnation method utilizing ordered mesoporous carbon （OMC） and tin （IV） oxide （SnO2） with different *** structure and electrochemical properties of the OMC/SnO2 composites were characterized by XRD,TEM and cyclic voltammetry （CV）.Pore characteristics were measured by nitrogen adsorption and desorption *** results show that the structure and electrochemical properties of the composites depend mainly on the loading amount of SnO2 in the ordered mesoporous *** optimum amount of SnCl4 added is found to be 40 % （1.54 g ethanol-based SnCl4·5H2O added to 1 g OMC） of the saturated *** specific capacitance of the composite of optimum amount of SnCl4 （200 F g-1） is nearly three times of that of the pristine SnO2 （72 F g-1） at the scan rate of 5 mV s-1,and its specific capacitance is almost equal to that of the ordered mesoporous carbon （126 F g-1） at the scan rate of 200 mV ***,it has better specific volumetric energy density than OMC due to its higher ***,in the potential range of 0-0.9 V the composite electrode material exhibits a stable cycle life after 500 cycles.

关键词： supercapacitors composite tin oxide electrochemical properties