As chair of BRICS in 2018,South Africa seeks to solidify the BRICS partnership and foster greater mutual understanding among peoples of BRICS members This is a big year for South Africa and BRICS.The country assumed t...As chair of BRICS in 2018,South Africa seeks to solidify the BRICS partnership and foster greater mutual understanding among peoples of BRICS members This is a big year for South Africa and BRICS.The country assumed the role of chair of BRICS on January1 and will remain in this position until December 31.In addition,the year is a milestone as the 10th BRICS Summit will展开更多
We live in fast-moving times and an increasingly interconnected world.Globalization has reached new heights in the 21st century.Together with new technology,it has brought enormous benefits to many,but these gains hav...We live in fast-moving times and an increasingly interconnected world.Globalization has reached new heights in the 21st century.Together with new technology,it has brought enormous benefits to many,but these gains have not been distributed evenly,which has been a source of discontent and the cause of recent backlashes against the very processes of globalization.Indeed,when about half of the展开更多
The formation and growth behavior of inclusions in the liquid steel were studied based on 45 steel by virtue of high temperature confocal laser scanning microscope.The structures of all kinds of complex inclusions for...The formation and growth behavior of inclusions in the liquid steel were studied based on 45 steel by virtue of high temperature confocal laser scanning microscope.The structures of all kinds of complex inclusions formed in the process of cooling and solidification of liquid steel were analyzed,and disregistries between various inclusions were calculated.The results showed that inclusions with high melting point precipitated firstly,and inclusions with low disregistries precipitated later.The latter precipitated and grew up on the surface of the former,and finally clear layered complex inclusions formed.The low disregistry mechanism could not fully explain the forming reasons of all complex inclusions,but no matter which kind of mechanism leading to the formation of complex inclusions,its basic principle is that the first precipitated phase provides a low nuclear power interface for the latter,which can reduce the nucleation interface and strain energy barrier of the latter.展开更多
Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obviou...Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obvious growth of titanium nitride on a primary inclusion particle was observed due to the rapid solute diffusion in liquid steel.The onset of titanium nitride precipitation did not change with primary inclusion particle size,but the time of growth was greater for a smaller primary inclusion particle.Meanwhile,the particle size displayed little influence on the total precipitated amount of titanium nitride on it under the same conditions.At the later period of solidification,almost no change occurred in inclusion size,but the inclusion shape varied from circle to almost square in two-dimension,or cubic in three-dimension,to attain the equilibrium with steel.展开更多
文摘As chair of BRICS in 2018,South Africa seeks to solidify the BRICS partnership and foster greater mutual understanding among peoples of BRICS members This is a big year for South Africa and BRICS.The country assumed the role of chair of BRICS on January1 and will remain in this position until December 31.In addition,the year is a milestone as the 10th BRICS Summit will
文摘We live in fast-moving times and an increasingly interconnected world.Globalization has reached new heights in the 21st century.Together with new technology,it has brought enormous benefits to many,but these gains have not been distributed evenly,which has been a source of discontent and the cause of recent backlashes against the very processes of globalization.Indeed,when about half of the
基金Sponsored by Natural Science Foundation of Hebei Province of China(E2013209207)
文摘The formation and growth behavior of inclusions in the liquid steel were studied based on 45 steel by virtue of high temperature confocal laser scanning microscope.The structures of all kinds of complex inclusions formed in the process of cooling and solidification of liquid steel were analyzed,and disregistries between various inclusions were calculated.The results showed that inclusions with high melting point precipitated firstly,and inclusions with low disregistries precipitated later.The latter precipitated and grew up on the surface of the former,and finally clear layered complex inclusions formed.The low disregistry mechanism could not fully explain the forming reasons of all complex inclusions,but no matter which kind of mechanism leading to the formation of complex inclusions,its basic principle is that the first precipitated phase provides a low nuclear power interface for the latter,which can reduce the nucleation interface and strain energy barrier of the latter.
基金the financial support provided by the Key Technology Development of Bearing Steel for Major Equipment of China(No.2012AA03A503)
文摘Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obvious growth of titanium nitride on a primary inclusion particle was observed due to the rapid solute diffusion in liquid steel.The onset of titanium nitride precipitation did not change with primary inclusion particle size,but the time of growth was greater for a smaller primary inclusion particle.Meanwhile,the particle size displayed little influence on the total precipitated amount of titanium nitride on it under the same conditions.At the later period of solidification,almost no change occurred in inclusion size,but the inclusion shape varied from circle to almost square in two-dimension,or cubic in three-dimension,to attain the equilibrium with steel.
