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Effects of precipitation strengthening heat treatment for Al-Mg alloy

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1218-1224页

作者： Seong-Jong KIM Seok-Ki JANG Min-Su HAN Seong-Kwon KIM Jong-Sin KIM Division of Marine System Engineering Mokpo Maritime University Mokpo City Jeonnam 530-729 Korea Media Engineering Seoul National University of Technology Seoul 139-743 Korea Korean Register of Shipping Tokyo Branch Office 3rd F Sanko BLDG＇ 4-11 Nohonbashi Kodenma-cho Cho-ku 103-0001 Tokyo Japan

The corrosions resulting from defects in painting layers frequently occur in Al alloys, so the application of corrosion preventing systems is also very important. Optimum conditions in terms of electrochemistry in relation to solution treatment, quenching and artificial aging treatment were established in order to optimize precipitation strengthening conditions intended to enhance the strength of Al alloys. slow strain rate tests （SSRT） at various applied potentials were conducted in potential range from -1.8 to 0.5 V. The results show that the maximum tensile strengths, elongations and time-to-fracture are shown to be high values. After precipitation strengthening heat treatment, a tendency appear that time-to-fracture increases as elongation increases. In the potential range from -1.3 V to -0.7 V, the specimens show excellent mechanical properties, and thus this range is considered to be a corrosion prevention range.

关键词： Al alloy slow strain rate test electrochemistry precipitation strengthening heat treatment mechanical property

Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 579-589页

作者： Ji-Jin Xu Shuai Wang Ze Chai Chun Yu Jun-Mei Chen Hao Lu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

The stress corrosion cracking(SCC)behaviour of AISI 304 pipe girth welds which were welded by a single-pass laser beam welding(LBW)and a multi-pass tungsten inert gas welding(TIG),respectively,was studied by the slow strain rate tests combined with the electrochemical corrosion *** results show that fracture of both the TIG joint and LBW joint occurs in the heat-affected zone(HAZ).According to the electron-backscattered diffraction observation of the micro structures,comparison of potentiodynamic polarization curves and X-ray photoelectron spectroscopy analysis of corrosion products on HAZs of the two joints after the electrochemical tests,the LBW joint exhibits better SCC resistance than the TIG joint in corrosion environments,due to the synthetic effect of more Cr_(2)O_(3) in corrosion products,finer grains,lower residual strain and higher δ-ferrite content in its *** the TIG joint has better mechanical property,considering lower SCC susceptibility and higher production efficiency of the LBW joint,the LBW promisingly replaces the TIG for welding of AISI304 pipes in the nuclear power industry.

关键词： Laser beam welding slow strain rate test Stress corrosion cracking Tungsten inert gas welding AISI 304 stainless steel

Relationship between hydrogen concentration and mechanical properties of 5Ni-16Cr-Mo steel

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Journal of Central South University 2021年第3期28卷 699-711页

作者： SUN Yong-wei CHEN Ji-zhi WANG Ling-shui Luoyang Sunrui Special Equipment Co. Ltd.Luoyang 471000China Luoyang Ship Material Research Institute Luoyang 471000China

The qualitative relationship between hydrogen concentration and notch tensile strength has been investigated for 5Ni-16Cr-Mo steel with different *** notch tensile strength was determined by means of slow strain rate test(SSRT)on circumferentially notched round bar specimens with the notch root radius of 0.15 mm after hydrogen ***,the hydrogen diffusion behaviors of various strength steel were studied by thermal desorption spectroscopy(TDS)*** SSRT results show that the T460 steel has higher susceptibility of hydrogen embrittlement in contrast with T520 *** activation energies and microstructure indicate that the dislocations and interfaces of martensitic laths are hydrogen traps in 5Ni-16Cr-Mo *** SSRT,the elastic limit of charged specimen loaded in air is higher than the flow stress without hydrogen charging before unloading,while the difference is defined as hydrogen-induced *** value of hydrogen-induced stress σ*increases linearly with hydrogen concentration:σ*=−0.622+*** finite element analysis results of stress distributions near the notch tip have shown that the maximum principal stress increases with the notch root radius decreasing.

关键词： 5Ni-16Cr-Mo steel slow strain rate test thermal desorption spectroscopy finite element analysis hydrogen embrittlement

Microstructure,mechanical properties and stress corrosion behavior of friction stir welded joint of Al-Mg-Si alloy extrusion

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Rare Metals 2023年第6期42卷 2057-2067页

作者： Sen Lin Yun-Lai Deng Hua-Qiang Lin Ling-Ying Ye Zhen Zhang Hua Ji Xin-Ming Zhang School of Materials Science and Engineering Central South UniversityChangsha410083China Light Alloy Research Institute Central South UniversityChangsha410083China Guangxi Liuzhou Yinhai Aluminum Co. LtdLiuzhou545006China National Engineering Research Center for High-Speed EMU CRRC Qingdao Sifang Co.LtdQingdao266000China

Microstructure,mechanical properties and stress corrosion behavior of friction stir welded(FSWed) AlMg-Si alloy were *** average grain sizes of shoulder-affected zone(SAZ),nugget zone(NZ),heat-affected zone(HAZ) and base material(BM) are 6.03,4.80,168.30 and 127.24 μm,*** thermo-mechanically affected zone(TMAZ),which is generated on the edge position between HAZ and weld nugget zone,has a narrow width of 400 μ*** ultimate tensile strength(UTS) of FSWed joint is 232.20 MPa,about 91.04% with respect to that of base material of 255.06 MPa,and the joint fracture occurs at HAZ on advancing side(AS).The FSWed joint is more susceptive to stress corrosion cracking(SCC) than base material,and the SCC susceptibility increases with the rise in *** residual UTS of FSWed joints in constant loaded tests at the load levels of90,105 and 120 MPa is 89.97%,67.50% and 54.75% of the UST of FSWed joint in air,*** increase of the load in constant loaded tests and four-point beambent tests accelerates the SCC of FSWed joints.

关键词： EBSD slow strain rate test Stress corrosion cracking Al-Mg-Si alloy Friction stir welding

Influence of Zn Content on Microstructures,Mechanical Properties and Stress Corrosion Behavior of AA5083 Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1369-1378页

作者： Zhixiong Zhu Xingxu Jiang Gang Wei Xiaogang Fang Zhihong Zhong Kuijing Song Jian Han Zhengyi Jiang School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Mechanical Engineering and Automation University of Science and Technology LiaoningAnshan 114051China

To enhance the stress corrosion cracking(SCC)resistance,Zn was utilized as an alloy element to add in the AA5083 aluminum *** effects of Zn content on the microstructures,mechanical properties and SCC resistance were systematically *** results demonstrate that in the studied range adding Zn can significantly improve the SCC resistance of the AA5083 *** is related to the relatively low amount of continuous β(Al3Mg2)phase along grain boundary and the formation of Zn-containing phase such as Al5Mg11Zn4 *** on the results,the optimal Zn content with respect to SCC resistance is approximately 0.50 wt.%.Further increasing Zn content results in coarse precipitates discontinuously distributed along grain boundaries.

关键词： AA5083 aluminum alloy slow strain rate test Precipitation Stress corrosion cracking

Effect of vanadium on hydrogen embrittlement susceptibility of high-strength hot-stamped steel

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Journal of Iron and Steel Research International 2021年第2期28卷 211-222页

作者： Wei-jian Chen Peng-fei Gao Shuai Wang Hong-zhou Lu Zheng-zhi Zhao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology University of Science and Technology BeijingBeijing 100083China CITIC Metal Co. Ltd.Beijing 100004China

Based on the chemical composition of traditional hot-stamped steel(e.g.,22MnB5 and 30MnB5),Nb and V microalloying elements are added into 30MnB5 steel to meet the requirements of ultra-high strength,excellent ductility and potent resistance to hydrogen embrittlement(HE)at the same *** influence of hot-stamped steel on HE was studied by conducting a hydrogen permeation method and pre-charged hydrogen slow strain rate ***,the experimental steel microstructures and corresponding fracture surfaces are observed and analyzed to characterize HE *** results show that a finer microstructure,a lower apparent diffusion coefficient of hydrogen and a smaller percentage of strength and plasticity reduction are obtained due to the addition of the vanadium element into hot-stamped *** to the V free experimental steel,the steel with 0.14 wt.% V has a large number of dispersive precipitates and more grain boundary areas,which makes hydrogen atoms dispersedly distribute.

关键词： Hot-stamped steel Vanadium Hydrogen embrittlement Hydrogen permeation test slow strain rate test Microstructure

Investigation into Hydrogen Diffusion and Susceptibility of Hydrogen Embrittlement of High Strength 0Cr16Ni5Mo Steel

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Journal of Iron and Steel Research International 2015年第10期22卷 961-968页

作者： Yong-wei SUN Ji-zhi CHEN Jun LIU College of Materials Science and Chemical Engineering Harbin Engineering University Luoyang Ship Material Research Institute

High strength bolt steel 0Crl6Ni5Mo was charged with hydrogen by means of electrochemical technique to evaluate the hydrogen diffusion behavior. The bolt steels were investigated by a combination of electrochemical hydrogen permeation, thermal desorption spectroscopy （TDS）, slow strain rate test （SSRT） and microstructure observation. The hydrogen concentration of both 10.9 grade （Rm=950-1 150 MPa） and 12.9 grade （Rm=1 150-1 250 MPa） bolt steels increases with increasing the hydrogen charging current densities and charging time. The 12.9 grade bolt steel has higher apparent diffusion coefficient than 10.9 grade steel, corresponding to the value of 4.7×10 7 mm^2/s. By means of TDS tests, the activation energies of the two experimental steels are 17.74 kJ/mol and 18.92 kJ/mol, respectively. The hydrogen traps of both grade bolt steels are dislocations and crystal lattice. The notch tensile strength of the steels is reduced with the hydrogen concentration carried out by SSRT. The fracture morphologies of the steels after hydrogen charging present ductile dimple and quasi-cleavage characteristic.

关键词： 0Cr16Ni5Mo steel hydrogen diffusion hydrogen permeation thermal desorption spectroscopy slow strain rate test