In this study,two API X80 pipeline steels were fabricated by varying Ti additions,and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tens...In this study,two API X80 pipeline steels were fabricated by varying Ti additions,and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties.Lathy bainite,a mass of matensite/austenite（M/A）,coarse cubic Ti-enriched inclusions,chain-typed Ti-enriched precipitations,weak toughness and high tensile strength were found as consequences of higher amount of Ti content.Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture.The negative effect of higher amount of Ti on the impact properties is increased with decreased temperature.展开更多
The process of Luda ilmenite smelting by plasma furnace has been studied by means of self-designed plasma torch. The prereduced Luda ilmenite was melted satisfactorily in plasma furnace to produce Ti enriched slag con...The process of Luda ilmenite smelting by plasma furnace has been studied by means of self-designed plasma torch. The prereduced Luda ilmenite was melted satisfactorily in plasma furnace to produce Ti enriched slag containing 90-98% TiO_2.展开更多
基金the financial supports from the Fundamental Research Funds for the Central Universities(No.N090607002)the National Natural Science Foundation of China(No.51074052)
文摘In this study,two API X80 pipeline steels were fabricated by varying Ti additions,and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties.Lathy bainite,a mass of matensite/austenite（M/A）,coarse cubic Ti-enriched inclusions,chain-typed Ti-enriched precipitations,weak toughness and high tensile strength were found as consequences of higher amount of Ti content.Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture.The negative effect of higher amount of Ti on the impact properties is increased with decreased temperature.
文摘The process of Luda ilmenite smelting by plasma furnace has been studied by means of self-designed plasma torch. The prereduced Luda ilmenite was melted satisfactorily in plasma furnace to produce Ti enriched slag containing 90-98% TiO_2.
