In order to meet the progressive requirement for the performance improvement of steel,the author proposed a novel microstructure featured with multi-phase,meta-stable and multi-scale(so-called as M 3).And then,the new...In order to meet the progressive requirement for the performance improvement of steel,the author proposed a novel microstructure featured with multi-phase,meta-stable and multi-scale(so-called as M 3).And then,the new technologies could be developed to process three prototype steels with high performance:the third generation high strength low alloy(HSLA) steels with improved toughness and/or ductility(AKV(40℃)≥200 J and/or A≥20% when Rp0.2 in 800-1000 MPa),the third generation advanced high strength steels(AHSS)(Rm×A≥30 GPa% when Rm from 1000 MPa to 1500 MPa) for automobiles with improved ductility and low cost,and heat resistant martensitic steels with improved creep strength(10000650≥90 MPa).It can be expected that the new technology developed will remarkably improve the safety and reliability of steel products in service for infrastructures,automobiles and fossil power station in the future.展开更多
A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated...A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law constitution at 650 °C are 1.1×10?21 and 8.1, respectively.展开更多
基金Ministry of Science and Technology is acknowledged for the financial funding of the"973 program" of Grant No. 2010CB630800
文摘In order to meet the progressive requirement for the performance improvement of steel,the author proposed a novel microstructure featured with multi-phase,meta-stable and multi-scale(so-called as M 3).And then,the new technologies could be developed to process three prototype steels with high performance:the third generation high strength low alloy(HSLA) steels with improved toughness and/or ductility(AKV(40℃)≥200 J and/or A≥20% when Rp0.2 in 800-1000 MPa),the third generation advanced high strength steels(AHSS)(Rm×A≥30 GPa% when Rm from 1000 MPa to 1500 MPa) for automobiles with improved ductility and low cost,and heat resistant martensitic steels with improved creep strength(10000650≥90 MPa).It can be expected that the new technology developed will remarkably improve the safety and reliability of steel products in service for infrastructures,automobiles and fossil power station in the future.
基金Project (No 51074113) supported by the National Natural ScienceFoundation of China
文摘A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law constitution at 650 °C are 1.1×10?21 and 8.1, respectively.
