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| 1 | Effects of Filler Metal Composition on Inclusions and Inclusion Defects for ER NiCrFe-7 Weldments显示文摘The effects of filler metal(FM) composition on inclusions and inclusion defects for ER NiCrFe-7 weldments have been investigated and analyzed.Results show that as Al,Ti content in FM increases from 0.14 wt%Al,0.30 wt% Ti to 0.42 wt%Al,0.92 wt%Ti,the Al,Ti reduction will increase during welding.Inclusion defects(point-like defects named by welding workers) are prone to form in the high Al,Ti content weldments.Inclusion defects with Mg,Ca,Al,and Ti as major metallic elements have been found on the surface and interior of the weldments,as Al,Ti content in FM is over 0.29 wt%Al,0.62 wt%Ti.Less Ti content in FM cannot prevent ductility-dip-cracking(DDC) through producing enough intragranular precipitates and lessening intergranular M_(23)C_6 precipitates.Nb can be used to replace Ti to reduce the sensitivity of the DDC in the NiCrFe-7 alloy weldments. | Wenlin Mo Shanping Lu Dianzhong Li Yiyi Li | 2013 | Journal of Materials Science & Technology2013，29，5： | 11 |
| 2 | Effects of Boron on the Microstructure,Ductility-dip-cracking,and Tensile Properties for NiCrFe-7 Weld Metal显示文摘The distribution of boron and the microstructure of grain boundary(GB) precipitates(M_(23)(C,B)_6 and M_2B)have been analyzed with their effects on the susceptibility of ductility-dip-cracking(DDC) and tensile properties for NiCrFe-7 weld metal,using optical microscopy(OM),secondary ion mass spectroscopy(SIMS),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The results show that boron segregates at GBs in NiCrFe-7 weld metal during the welding process.The segregation of boron at GBs promotes the formation of continuous M_(23)(C,B)_6 carbide chains and M_2B borides along GBs.The addition of boron aggravates GB embrittlement and causes more DDC in the weld metal,by its segregation at GBs presenting as an impurity,and promoting the formation of larger and continuous M_(23)(C,B)_6 carbides,and M_2B borides along GBs.DDC in the weld metal deteriorates the ductility and tensile strength of the weld metal simultaneously. | Wenlin Mo Xiaobing Hu Shanping Lu Dianzhong Li Yiyi Li | 2015 | Journal of Materials Science & Technology2015，31，12： | 9 |
| 3 | Effect of Structural Parameters of Double Shielded TIG Torch on the Fusion Zone Profile for 0Cr13Ni5Mo Martensitic Stainless Steel显示文摘The effects of double shielded TIG(tungsten inert gas)torch’s structural parameters,including the flow rate ratio between the inner and outer layers of gas and the extended length of the electrode(abbreviated as ELE in this work),on the fusion zone profile have been investigated for 0Cr13Ni5Mo martensitic stainless steel.Results show that the double shielded TIG process yields relatively high penetration of the weld pool in a broad range of the structural parameters.ELE over 3 mm is too large and causes adverse reactions on the protection of electrode.The outer gas with relatively high flow rate or the outer layer with high oxygen content is conducive to the oxygen dissolved into the arc,which results in the oxidation of the weld pool surface and the electrode tip.The double shielded TIG welded metal was tested and presented good impact property. | Dongjie Li Shanping Lu Dianzhong Li Yiyi Li | 2014 | Journal of Materials Science & Technology2014，30，9： | 4 |
| 4 | Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents显示文摘The microstructure evolutions and the mechanical properties of the 25Cr-20Ni austenitic stainless steel weld metals with different Nb contents were investigated during the long term aging treatment at 700~?C.M_(23)C_6,Nb(C,N),α-Cr phase and Nb-nitride phase(Z phase)were observed in the microstructures of the aged weld metals.The results showed that theα-Cr phase precipitated in the interdendritic regions of the weld metals after being exposed to~ 700?C for 500 h and the element Nb accelerated the precipitation of theα-Cr phase significantly.The density of theα-Cr phase decreased with the increase of the distance away from the primary Nb(C,N).Additionally,theα-Cr phase showed a crystallographic relationship with the austenitic matrix,■.It was observed that the Z phase precipitated in the periphery of the Nb(C,N)and may replace the Nb(C,N)after long term exposure to high temperature.The transformation of the Nb(C,N)into Z phase suggested that the Z phase had a higher stability than the Nb(C,N)par^ticles at 700?C for long term aging.The tensile strength of the Nb-bearing weld metal showed a continuous decrease at the initial stage of the aging treatment and then went up slightly with the prolonged aging time.However,the elongations and the impact energies of the weld metals decreased monotonously with the increase of the aging time. | Xu Zhang Dianzhong Li Yiyi Li Shanping Lu | 2019 | Journal of Materials Science & Technology2019，35，4： | 3 |
| 5 | δ-ferrite transformation mechanism and its effect on mechanical properties of 316H weld metal显示文摘The microstructure evolution and mechanical properties of the 316 H stainless steel weld metals with different C contents were studied at the aging temperature of 550℃ for different aging holding time.The transformation behavior of δ-ferrite and precipitation mechanisms of M(23)C6 and σ phase in the as-aged weld metal were investigated.The results indicated that for the as-welded weld metal,with increasing C content,the yield and tensile strengths increased,while the elongation decreased owing to the increase of C solid solution strengthening effect.Moreover,both the high δ-ferrite content in low C weld metal and the precipitated M(23)C6 carbide in high C weld metal deteriorated the impact energy obviously.During the aging process,the rapid precipitation of M(23)C6 carbide occurred in σ-ferrite firstly owing to the high diffusion rate of C.Once the carbon is depleted by precipitation of M(23)C6,the slow formation of σ phase occurred through eutectoid transformation(δ→σ+γ) depending on the diffusion of Cr and Mo.Moreover,increasing C content promoted the formation of M(23)C6 carbides and inhibited the formation of σ phase.Therefore,increasing C content accelerated the transformation of σ ferrite in weld metal during aging process.Furthermore,after a long enough aging time,a transformation from M(23)C6 to σ occurred.The variations of mechanical properties with aging conditions depended to a large extent on the microstructures at different aging conditions.For the low C weld metal aged at 550℃,with the increase of the aging time,fine M(23)C6 first precipitated,then coarsened,after that σ phase formed,which caused that the yield and tensile strengths first increased,then decreased,and finally increased slightly again.For the medium C weld metal,as the aging time increased,first the depletion of the solid solution C as a result the M(23)C6 precipitation deteriorated the strength,and then the formation of σ phase improved the strength.For the high C weld metal,with the increase of the aging time,the depletion of the solid solution C and the coarsening of the M(23)C6 precipitates deteriorated the strength.Furthermore,with increasing aging time,both the precipitation and coarsening of M(23)C6 and increasing σ phase content deteriorated the elongation and impact ene rgy. | Langlang Zhao Shitong Wei Dong Wu Dianbao Gao Shanping Lu | 2020 | Journal of Materials Science & Technology2020，54，22： | 3 |
| 6 | Principles Giving High Penetration under the Double Shielded TIG Process显示文摘A new welding method named double shielded tungsten inert gas(TIG) has been developed to improve the TIG weld penetration.The main principles to increase the weld depth have been discussed.Results show that the critical oxygen content in the weld pool is around 100 × 10^(-6) as the temperature coefficient of surface tension changes from negative to positive.The tracer test using pure silver shows that the direction of Marangoni convection changes as the oxygen content increases in the weld pool.The effect of arc constriction on the weld depth has been evaluated on a water-cooled copper plate,and the result indicates that the torch of double shielded can give a more powerful arc.Heavy oxide on the pool surface has undesirable impacts on the increasing of weld depth as the oxygen excessively accumulates in weld pool.It is possible to form chromium oxide in the weld process,while the iron oxide may form as the weld surface exposes to the air after the shielded gas moving away. | Dongjie Li Shanping Lu Dianzhong Li Yiyi Li | 2014 | Journal of Materials Science & Technology2014，30，2： | 3 |
| 7 | Effect of Carbon Content on the Creep Rupture Properties and Microstructure of 316H Weld Metals显示文摘Two types of 316 butt welds with carbon contents of 0.016%and 0.062%have been produced using the gas tungsten arc welding process.Theδ-ferrite content decreased from 7.2 to 2.8%in volume as the carbon content increased.The creeprupture strength and creep ductility of the two types of weld metals have been measured at 550℃over the stress range of 290-316 MPa and at 600℃over 230-265 MPa.The microstructure change and precipitation behavior of the weld metals were observed and related to the creep rupture properties.The creep rupture strength of the C2(0.062%C)weld metal was higher than that of the Cl(0.016%C)weld metal at both 550℃and 600℃.At 550℃,as the decrease in the applied stress,the difference of the creep-rupture life between the two weld metals diminished due to the higher depletion rate of carbon by precipitation of M_(23)C_(6) in the C2 weld metal,while at 600℃,the difference enlarged due to the massive precipitation ofσphase and extensive crack formation and propagation alongσ/austenite boundaries in the C1 weld metal.For both the C1 and C2 weld metal,the decrease in ductility was adverse with the transformation percentage and related to products of theδ-ferrite transformation. | Langlang Zhao Shitong Wei Dianbao Gao Shanping Lu | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，7： | 2 |
| 8 | Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO_2) Double Shielded GTA Welding显示文摘Double shielded gas tungsten arc welding (GTAW, also known as tungsten inert gas (TIG) welding) of an SUS304 stainless steel with pure inert argon as the inner layer shielding and the Ar-CO2 or CO2 active gas as the out layer shielding was proposed in this study to investigate its effect on the tungsten electrode protection and the weld shape variation. The experimental results showed that the inner inert argon gas can successfully prevent the outer layer active gas from contacting and oxidizing the tungsten electrode during the welding process. Active gas, carbon dioxide, in the outer layer shielding is decomposed in the arc and dissolves in the liquid pool, which effectively adjusts the active element, oxygen, content in the weld metal. When the weld metal oxygen content is over 70× 10-6, the surface-tension induced Marangoni convection changes from outward into inward, and the weld shape varies from a wide shallow one to a narrow deep one. The effect of the inner layer gas flow rate on the weld bead morphology and the weld shape was investigated systematically. The results show that when the flow rate of the inner argon shielding gas is too low, the weld bead is easily oxidized and the weld shape is wide and shallow. A heavy continuous oxide layer on the liquid pool is a barrier to the liquid pool movement. | Shanping Lu Hidetoshi Fujii Kiyoshi Nogi | 2010 | Journal of Materials Science & Technology2010，26，2： | 2 |
| 9 | Microstructural evolution and stress relaxation cracking mechanism for Super304H austenitic stainless steel weld metal显示文摘The pre-compressed CT technique was used to quantitatively investigate the formation of stress relaxation cracks under different tensile residual stresses and aging time in Super304H austenitic stainless steel weld metal.The statistical results revealed that intergranular cracks could occur within 2000 h under 650℃ when the residual stress was applied with greater than 18 KN pre-compression force.Detailed grain interior and boundary analyses showed that the growth of intragranular Cu-rich particles could induce a strong grain interior,and the intergranular Nb(C,N)carbides were one of the causes to crack under short-term aging time.For long-term aging time conditions,the intergranular M_(23)C_(6)carbides were more susceptible to crack than intergranular Nb(C,N)carbides.Finally,the mechanism responsible for stress relaxation cracking formation was carefully illustrated for the weld metals after short-term aging and long-term aging,respectively. | Xiaopeng Xiao Dianzhong Li Yiyi Li Shanping Lu | 2022 | Journal of Materials Science & Technology2022，，5： | 2 |
| 10 | Influence of welding parameters and shielding gas composition on GTA weld shape显示文摘 | Shanping LU Hidetoshi FUJII Kiyoshi NOGI | 2005 | ISIJ International2005，，45： | 1 |
| 11 | Effects of CO2Shielding Gas Additions and Welding Speed on GTA Weld Shape显示文摘 | Lu Shanping Fujii Hidetoshi Nogi Kiyoshi | 2005 | Journal of Materials Sci-ence2005，40，910： | 1 |
| 12 | Wear behavior of brazed WC/NiCrBSi (Co) composite coatings 显示文摘 | Lu Shanping Kwon Ohyang Guo Yi | 2003 | Wear2003，，25： | 1 |
| 13 | Development of an advancedA-TIG (AA-TIG)welding method by control of Marangoniconvection显示文摘 | Fuji Hidetoshi Sato Toyoyuki Lu Shanping | 2008 | Materials Science andEngineering A2008，495，： | 1 |
| 14 | Sensitivity of Marangoni convection and weld shape variations to welding parameters in O2-Ar shielded GTA welding 显示文摘 | Lu Shanping Fujii Hidetoshi Nogi Kiyoshi | 2004 | Scripta Materialia2004，51，： | 1 |
| 15 | Weld penetration and marangoni convection with oxide fluxes in GTA welding显示文摘 | Lu Shanping Fujii Hidetoshi Sugiyama Hiroyuki | 2002 | Materials Transactions2002，43，11： | 1 |
| 16 | Weld penetration and marangoni convection with oxide fluxes in GTA welding 显示文摘 | LU Shanping Hidetoshi Fuiii Hiroyuki Sugiyama | 2002 | Materials Transactions2002，43，11： | 1 |
| 17 | Wear behavior of brazed WC/NiCrBSi(Co) composite coatings显示文摘 | Lu Shanping Kwon Ohyang C uo Yi | 2003 | Wear2003，254，56： | 1 |
| 18 | Effects of Ti-bearing inclusions on the microstructure and mechanical properties of MAG multilayer weld metal显示文摘The metal active gas (MAG) multilayer weld metal consists of the columnar grain zone (CGZ) and the fine grain zone (FGZ). Mechanical properties and microstructure of the CGZ and FGZ have been analyzed and evaluated. The inclusion with a size of 0.2-1.0 μm is typical log-normal distribution. The morphology of inclusions has been analyzed using transmission electron microscope (TEM). With the microalloying element Ti addition, much MnTiO3 phase precipitates on the Mn-silicates matrix, which is beneficial for the nucleation of acicular ferrite (AF). The probable mechanism for the nucleation of AF has been discussed. | Xin WANG Wenchao DONG Shanping LU Guangzhong HE Xu ZHAO Dianmai ZHOU Yiyi LI | 2012 | Acta Metallurgica Sinica(English Letters)2012，25，1： | 1 |
| 19 | Marangoni convection and weld shape variations in Ar-O2 and At-CO2 shielded GTA welding显示文摘 | LU Shanping FUJII H NOGI K | 2004 | Materials Science and Engineering A2004，380，： | 1 |
| 20 | Sensitivity of marangoni convection and weld shape variations to welding parameters in O2-Ar shielded GTA welding显示文摘 | LU Shanping FUJII H NOGI K | 2004 | Scripta Materialia2004，51，： | 1 |
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