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Corrosion Behavior of Ultra-high Strength Steel 300M in Different Simulated Marine Environments 被引量:1
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作者 郭强 刘建华 +1 位作者 yu mei li songmei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第2期372-378,共7页
Corrosion behavior of 300M in neutralcorrosion environments containing Na Clsimulated by totalimmersion(TI),salt spraying(SS)and periodic immersion(PI),was investigated by surface analysis techniques,corrosion w... Corrosion behavior of 300M in neutralcorrosion environments containing Na Clsimulated by totalimmersion(TI),salt spraying(SS)and periodic immersion(PI),was investigated by surface analysis techniques,corrosion weight-loss method,and electrochemicalmeasurements.In totalimmersion environment,rust on the steelconsisted of a porous outer rust layer with main constituent of γ-Fe OOH,and an inner rust layer of dense Fe_3O_4 film with network broad cracks.In salt spraying environment,outer rust with main composition of γ-Fe OOH/α-Fe OOH/Fe_3O_4 was compact,and inner rust showed dense Fe_3O_4 film.Rust formed by periodic immersion exhibited a compact outer rust layer with constituent of α-Fe OOH/γ-Fe OOH/Fe_3O_4 and an inner rust layer with composition of α-Fe OOH/α-Fe_2O_3;inner rust showed a ultra-dense film adherent to the steel.The corrosion rate showed a rule of vss(salt spraying)〉vti(totalimmersion)〉〉vpi(periodic immersion)in 0-240 h,and vss≈vti?vpiin 240-720 h.The rust formed by periodic immersion was dense and compact,with stable electrochemicalproperties,and had excellent protection on the steel.Humidity and oxygen concentration in allthe environments played major roles in rust formation. 展开更多
关键词 ultra-high strength steel corrosion simulated corrosion environments chloride
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Effect of Microstructure on Corrosion Fatigue Behavior of 1500 MPa Level Carbide-Free Bainite/Martensite Dual-Phase High Strength Steel 被引量:4
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作者 XU Lei WEI Dong-yuan YU Yang ZHANG Han BAI Bing-zhe 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第4期63-67,共5页
Influence of microstructure of the experimental steels on the corrosion fatigue behavior in 3.5% of NaCl aqueous solution was studied.Experimental results show that compared with the full martensite(FM)steel,the car... Influence of microstructure of the experimental steels on the corrosion fatigue behavior in 3.5% of NaCl aqueous solution was studied.Experimental results show that compared with the full martensite(FM)steel,the carbide-free bainite/martensite(CFB/M)steel has higher corrosion fatigue strength and corrosion fatigue crack threshold(ΔKthcf),and lower corrosion crack propagation rate [(da/dN)cf]. 展开更多
关键词 high strength steel carbide-free bainite/martensite dual-phase steel corrosion fatigue
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Corrosion and mechanical properties of AM50 magnesium alloy after being modified by 1 wt.% rare earth element gadolinium 被引量:17
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作者 杨淼 刘耀辉 +1 位作者 刘家安 宋雨来 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第6期558-563,共6页
In order to improve the corrosion and mechanical properties of AM50 magnesium alloy, 1 wt.% Gd was used to modify the AM50 magnesium alloy. The microstructure, corrosion and mechanical properties were evaluated by X-r... In order to improve the corrosion and mechanical properties of AM50 magnesium alloy, 1 wt.% Gd was used to modify the AM50 magnesium alloy. The microstructure, corrosion and mechanical properties were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electrochemical and mechanical stretch methods. The results indicated that β-Mg17Al12 phase decreased and Al2Gd3 and Al0.4GdMn1.6 phase existed after Gd addition. Because of the Gd addition, the grain of AM50 magnesium alloy was refined significantly, which improved the tensile strength of AM50 magnesium al-loy. The decreasing ofβ phase improved the corrosion resistance of the magnesium alloy. The fracture mechanism of the Gd modified AM50 magnesium alloy was quasi-cleavage fracture. The corrosion residual strength (CRS) of AM50 magnesium alloy was im-proved after 1 wt.% Gd addition. 展开更多
关键词 magnesium alloy rare earth element Gd corrosion corrosion residual strength rare earths
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SCC investigation of low alloy ultra-high strength steel 30CrMnSiNi2A in 3.5wt% NaCl solution by slow strain rate technique 被引量:3
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作者 Liu Jianhua Guo Qiang +1 位作者 Yu Mei Li Songmei 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第5期1327-1333,共7页
To evaluate stress corrosion cracking(SCC) mechanism of low alloy ultra-high strength steel 30CrMnSiNi2 A in environment containing NaCl, SCC behavior of the steel in 3.5wt% NaCl solution is investigated by slow str... To evaluate stress corrosion cracking(SCC) mechanism of low alloy ultra-high strength steel 30CrMnSiNi2 A in environment containing NaCl, SCC behavior of the steel in 3.5wt% NaCl solution is investigated by slow strain rate technique(SSRT) with various strain rates and applied potentials, surface analysis technique, and electrochemical measurements. SCC susceptibility of the steel increases rapidly with strain rate decreasing from 1 · 10 5s 1to 5 · 10 7s 1, and becomes stable when strain rate is lower than 5 · 10 7s 1. SCC propagation of the steel in the solution at open circuit potential(OCP) needs sufficient hydrogen which is supplied at a certain strain rate.Fracture surface at OCP has similar characteristics with that at cathodic polarization 1000 mVSCE, which presents characteristic fractography of hydrogen induced cracking(HIC).All of these indicate that SCC behavior of the steel in the solution at OCP is mainly controlled by HIC rather than anodic dissolution(AD). 展开更多
关键词 Hydrogen NaCl solution Stress corrosion cracking Slow strain rate technique Ultra-high strength steel
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Experimental Investigation on Friction Welding of UNS S32205 Duplex Stainless Steel 被引量:3
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作者 P. M. Ajith P. Sathiya S. Aravindan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第6期995-1007,共13页
UNS S 32205 duplex stainless steel specimens were joined by continuous drive friction welding process. The experiments were conducted as per the Taguchi(L16 orthogonal array) method. The friction welding process par... UNS S 32205 duplex stainless steel specimens were joined by continuous drive friction welding process. The experiments were conducted as per the Taguchi(L16 orthogonal array) method. The friction welding process parameters such as heating pressure, heating time, upsetting pressure, upsetting time, and speed of rotation were fixed with low,medium, and high levels of range based on the machine capacity, and the required knowledge was acquired from the preliminary experiments. The joint characterization studies included micro structural examination and evaluation of mechanical properties of the joints. Microhardness variation, impact toughness, and tensile strength of the joints were evaluated. Neither a crack nor an incomplete bonding zone was observed. The tensile strength of the joints was higher than the strength of the base material, and the friction and upsetting pressures were found to influence the joint strength. The tensile strength of all the welds was observed to be increasing with an increase in the rotational speed. The toughness of the friction welds was evaluated at room temperature and also at subzero(cryo) temperature conditions. The toughness for friction welds was found to be superior to the fusion welds of duplex stainless steel at room temperature and cryo conditions. Weldments exhibited better corrosion resistance than the parent material. 展开更多
关键词 Duplex stainless steel Hardness Tensile strength Toughness Microstructure corrosion
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