Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual c...Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature toughness.The addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite formation.Titanium protected B from oxidizing as well as nitriding and formed Ti-Mn silicate inclusions.Ultra-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.展开更多
The superplastic behavior of adding 0.22%Sc into the Al 6Mg alloy was studied by simple superplastic pretreatment process—warm rolling and cold rolling. The optimum superplastic temperature and strain rate of the all...The superplastic behavior of adding 0.22%Sc into the Al 6Mg alloy was studied by simple superplastic pretreatment process—warm rolling and cold rolling. The optimum superplastic temperature and strain rate of the alloys were defined and satisfactory results were obtained during the superplastic deformation at 811 K and initial strain rate 0=1.67×10 -3 s -1 . The average elongation of Al 6Mg 0.22Sc alloys reaches to 1 125%, and the maximum elongation is 1 200%, maximum m value (strain rate sensitive index) is 0.879. But under the same condition the elongation and maximum m value for Al 6Mg alloy were only 377% and 0.595, respectively. The superplastic deforming mechanism for Al 6Mg 0.22Sc alloys was also discussed. [展开更多
The research,production,and application of V-N microalloyed high strength rebars in China were reviewed.Enhanced nitrogen in vanadium-containing rebars promotes the precipitation of fine V（C,N）particles,and markedly...The research,production,and application of V-N microalloyed high strength rebars in China were reviewed.Enhanced nitrogen in vanadium-containing rebars promotes the precipitation of fine V（C,N）particles,and markedly improves the precipitation strengthening effectiveness of vanadium.Therefore,vanadium added to V-N microalloyed rebars can be reduced by 40% compared to the same strength level of vanadium-containing rebars.展开更多
Ⅰ. INTRODUCTIONThough advances in Li battery research have been made in recent years, people still pay enough attention to high energy density battery, and also develop ultra-thin Li battery at the same time. This ki...Ⅰ. INTRODUCTIONThough advances in Li battery research have been made in recent years, people still pay enough attention to high energy density battery, and also develop ultra-thin Li battery at the same time. This kind of battery finds wide use in cards such as the ID, IC, credit, radiation, radio, computer as well as all card-shaped instrument.展开更多
文摘Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature toughness.The addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite formation.Titanium protected B from oxidizing as well as nitriding and formed Ti-Mn silicate inclusions.Ultra-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.
文摘The superplastic behavior of adding 0.22%Sc into the Al 6Mg alloy was studied by simple superplastic pretreatment process—warm rolling and cold rolling. The optimum superplastic temperature and strain rate of the alloys were defined and satisfactory results were obtained during the superplastic deformation at 811 K and initial strain rate 0=1.67×10 -3 s -1 . The average elongation of Al 6Mg 0.22Sc alloys reaches to 1 125%, and the maximum elongation is 1 200%, maximum m value (strain rate sensitive index) is 0.879. But under the same condition the elongation and maximum m value for Al 6Mg alloy were only 377% and 0.595, respectively. The superplastic deforming mechanism for Al 6Mg 0.22Sc alloys was also discussed. [
文摘The research,production,and application of V-N microalloyed high strength rebars in China were reviewed.Enhanced nitrogen in vanadium-containing rebars promotes the precipitation of fine V（C,N）particles,and markedly improves the precipitation strengthening effectiveness of vanadium.Therefore,vanadium added to V-N microalloyed rebars can be reduced by 40% compared to the same strength level of vanadium-containing rebars.
文摘Ⅰ. INTRODUCTIONThough advances in Li battery research have been made in recent years, people still pay enough attention to high energy density battery, and also develop ultra-thin Li battery at the same time. This kind of battery finds wide use in cards such as the ID, IC, credit, radiation, radio, computer as well as all card-shaped instrument.
