Grade A （GA） and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase （DP...Grade A （GA） and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase （DP） steels with different martensite volume fractions （MVFs） were produced from GA steel by means of heat treatment and they were compared with other steels through conducting mierostructure, microhardness, tensile and impact tests. The fracture surfaces of specimens （DH36, GA and DP steels） exposed to tensile and Charpy impact tests were investigated by scanning electron microscope. Furthermore, it was found that the specimens quenched from 800 and 900℃ had better strength than DH36 steel. The tensile test results indicated that the tensile strength of DP steel water quenched from 900℃ was 3 times that of GA steel and twice that of DH36 steel.展开更多
Based on analysis of green shipping practices of foreign ships manufacturers, ocean carriers ad port countries, their advanced experience was summarized, and its enlightenment to China＇s ＂green shipping＂ was analyz...Based on analysis of green shipping practices of foreign ships manufacturers, ocean carriers ad port countries, their advanced experience was summarized, and its enlightenment to China＇s ＂green shipping＂ was analyzed to realize China＇s dream of becoming ＂ a strong shipping country＂ eady.展开更多
文摘Grade A （GA） and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase （DP） steels with different martensite volume fractions （MVFs） were produced from GA steel by means of heat treatment and they were compared with other steels through conducting mierostructure, microhardness, tensile and impact tests. The fracture surfaces of specimens （DH36, GA and DP steels） exposed to tensile and Charpy impact tests were investigated by scanning electron microscope. Furthermore, it was found that the specimens quenched from 800 and 900℃ had better strength than DH36 steel. The tensile test results indicated that the tensile strength of DP steel water quenched from 900℃ was 3 times that of GA steel and twice that of DH36 steel.
文摘Based on analysis of green shipping practices of foreign ships manufacturers, ocean carriers ad port countries, their advanced experience was summarized, and its enlightenment to China＇s ＂green shipping＂ was analyzed to realize China＇s dream of becoming ＂ a strong shipping country＂ eady.
