【摘 要】
：
Strengthen-mechanism and corrosion resistance of niobium addition high strength low alloy weathering H-beams produced by ultra-fast cooling technology,had been investigated in this research.The result
【机 构】
：
University of Science and Technology Beijing,Xueyuan Road 30,Haidian District,Beijing,100083,China
论文部分内容阅读
Strengthen-mechanism and corrosion resistance of niobium addition high strength low alloy weathering H-beams produced by ultra-fast cooling technology,had been investigated in this research.The results show that the microstructure of the ultra-fast cooling weathering H-beams sample was consisted of polygonal ferrite and pearlite as well as fine,dispersive and uniform Nb(C,N)precipitates.Niobium element plays its role of grain refinement and precipitation strengthening by refining ferrite grains and obtaining(Nb,Ti)(C,N)precipitation,which significantly improved the strength and toughness.Furthermore,the corrosion resistance performance of weathering H-beams was also studied by simulated atmosphere-salt spray test.It was found that the corrosion rate and thickness reduction of the weathering H-beams with homogeneous rust layer were lower than that of conventional carbon steel Q345.The results also revealed that the corrosion process can be divided into initial stage in which corrosion rate increased with accumulation of corrosion products and the second stage in which homogenous,adherent and compact rust layer started to protect the steel substrate out of corrosion solution.
其他文献
The separate or combined addition of micro-alloying elements to the conventional weathering steel is usually applied in producing higher yield strength weathering steels.The target-oriented researches
For the purpose of reducing alloys additions and then its cost of conventionally combined Nb-V microalloyed Q460 grade steel plates for construction,a HSLA steel alloying design with only V-N microall
A high-performance Q370qE-HPS bridge steel with low carbon content(≤0.10wt%),Nb microalloying(0.025-0.050wt%)and low carbon equivalent(CEV)(≤0.38%)has been produced using TMCP procedure.The microstruc
This paper presents an actual case of a new industrial building at CBMMs plant in Araxá,Brazil as an example of lean design using microalloyed steels.The structure consists mostly of microalloyed ASTM
Recently,with the rapid upgrading of the equipment in the steel Corp,the rolling technology of TMCP has been rapidly developed and widely applied.A large amount of steel plate has been produced by usi
The results of experiments show that Nb can significantly lower phase transformation temperature and refined both lamellar space of pearlite and pearlite colony.The refinement on microstructure leads
Structural steels with yield strength requirements greater or equal to 690 MPa can be produced through controlled recrystallization hot rolling coupled with precipitation strengthening or purposeful h
The demand for more sustainable development promotes the need for components and steel structures with a longer useful life and better performance.Upgrade of wear steel plate used in key industry segm
The dynamic recrystallization behaviors of the microalloyed non-quenching and tempering steels of 38MnVS and C38N2 were studied by the simulation of hot deformation in the Gleeble3800.The stress versu
Hot compression tests were performed on gleeble-3800 thermal simulation machine to study the effect of different deformation parameters on microstructure of non-quenched and tempered steel with ferrit