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Theoretical calculation of the impact work in the alloying non-quenched and tempered steel

Science China(Technological Sciences) 2006年第3期49卷 257-273页

作者： liu zhilin1, lin cheng1 & guo yanchang2.1. department of materials and chemical engineering,{2., jinzhou 12.001, China 2. The Technical Center of Benxi Iron and Steel Group Corporation, Benxi 117000, China department of materials chemical engineering Liaoning Institute of Technology Jinzhou 121001 China The Technical Center of Benxi Iron Steel Group Corporation Benxi 117000 China

Coupled with hot-continuous rolling technology and based on the calculation of the finishing rolling impact work in the non-quenched and tempered Si-Mn steel, the calculations of the finishing rolling impact work in the alloying non-quenched and tempered steel with the elements of Cr, Ni, Mo, W, Cu, V, Nb and Ti are studied with the covalent electron number nA of the strongest bond in alloying phases, the smallest electron density difference ?ρ of phase interfaces, and the number of atom states σ (σ′) which keep the interface electron density continuous. The calculated results show that the finishing rolling impact work of the alloying non-quenched and tempered steel intensely depends on strengthening mechanisms. The solution strengthening, interface strengthening, precipita- tion strengthening of pearlite, and dispersion strengthening will result in the decrease of the finishing rolling impact work; the refinement strengthening, the precipitation strength- ening of V, Nb and Ti in α-Fe-C-V(Nb, Ti), and the residual austenite containing Ni on the boundary of α-Fe-C-Ni will increase the impact work; and the increments or decrements can be calculated with nA, ?ρ, σ (σ′) and weights of alloying elements. The calculation formulas of the finishing rolling impact work in this paper are intergraded with the sug- gested ones of the finishing rolling tensile strength, yield strength, and elongation of the non-quenched and tempered steel. The calculated results agree well with the measured ones.

关键词： alloying non-quenched and tempered steel, electron structure, impact work, calculation.

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Calculation of the yield and tensile strength in the alloying non quenched-tempered steel by the electron structure parameters

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Progress in Natural Science:materials International 2005年第9期15卷 832-837页

作者： liu zhilin1**, lin {2., liu Yan1 and guo {2. department of materials and chemical engineering, liaoning institute of technology, jinzhou 12.001, China 2. The Technical Center of Benxi Iron and Steel Group Corporation, Benxi 117000, China) department of materials and {2. engineering Liaoning Institute of Technology Jinzhou 121001 China. Technical Center of Benxi Iron and Steel Group Corporation Benxi 117000 China

Based on the phase transformations and strengthening mechanisms during rolling, the strength increments Δσbunder different strengthening mechanisms are calculated with the covalent electron number nAof the strongest bond in phase cells of alloys and the interface electron density difference Δρ matching the interface stress in alloys. The calculation method of the finishing rolling yield strength is proposed, and it is integrated with the proposed calculation formulas of strength of non quenched-tempered steel. Therefore, the general formulas to simultaneously calculate both the finishing rolling strength and the yield strength of the continuous casting-rolling and non quenched-tempered steel are given. Taken the pipeline steel X70 as an example, the predictions of properties and technological parameters are performed before production or online.

关键词： electron structure non quenched-tempered steel yield strength prediction of properties.

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Theoretical calculation of the finishing rolling elongation in alloying non-quenched and tempered steel

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Progress in Natural Science:materials International 2006年第8期16卷 859-867页

作者： liu zhilin, {2. cheng and guo {2. (department of materials and chemical engineering, liaoning institute of technology, jinzhou 12.001, China The Technical Center of Benxi Iron and Steel Group Corporation, Benxi 117000, China) [a]department of materials and {2. engineering Liaoning Institute of Technology Jinzhou China [b]The Technical Center of Benxi Iron and Steel Group Corporation Benxi China

The finishing rolling elongationδof the alloying non-quenched and tempered steel is calculated with the covalent electron number nA of the strongest bond of the alloying phases and the interface electron density differenceΔρof the phase interfaces. The calculations show that the elongationδα-Fe of the matrixα-Fe decreases with rolling refinement, the elongationδα-Fe-C-M of solid solution phases (M denotes alloying element) is inversely proportional to the covalent electron number nAα-Fe-C-M of the strongest bond, the elonga tion decrementΔδα-Fe/α-Fe-C-M caused by interface strengthening is directly proportional to the interface electron density differenceΔρα-Fe/α-Fe-C-M, but the elongation decrementsΔδα-Fe/MCC1 andΔδα-Fe-C/MCC2.caused by dispersion strengthening and precipitation strength- ening respectively are directly proportional to the ratio of the electron density differenceΔρα-Fe/MCC1 andΔρα-Fe/MCC2.of the strengthening interfaces toΔρα-Fe/α-Fe-C of the basic interfaceα-Fe/α-Fe-C. Therefore, the finishing rolling elongation of the alloying non-quenched and tempered steel is considered to be subtracting all the elongation decrements of solution strengthening, interface strengthening, dispersion strengthening and precipitation strengthening from the elongation of the refinedα-Fe matrix. The calculation formulas in this paper are integrated with the proposed ones ofσS,σb and ofαK delivered in another paper, the finishing rolling mechanical properties can be achieved and the calculated results agree well with the measured ones.

关键词： electron structure parameters alloying non-quenched and tempered steel elongation theoretical calculation.

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Calculation of the end-rolling strength in Q2.5strip steel by the alloying electron structure parameters

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Progress in Natural Science:materials International 2005年第3期 60-65页

作者： liu zhilin 1 ,{2. cheng 1ˇˇ ,liu Yan 1 and guo {2. 2. (1.department of materials and chemical engineering,liaoning {12. of technology,jinzhou12.001,China 2.The Technical Center of Benxi Iron and Steel Group Corporation,Benxi117000,China) department of materials and {2. engineering Liaoning Institute of Technology Jinzhou 121001 China The Technical Center of Benxi Iron and Steel Group Corporation Benxi 117000 China

Combined with the phase transformations in rolling,the phase configuration,the tensile strength,and the yield strength with different terminal rolling grain sizes in Q2.5strip steel have been theoretically calculated using the covalent electron number(n A )of the strongest bond in phase cells and the interface electron density difference(Δρ)in *** calculated results agree well with the results of real ***,the calculation method of terminal rolling tensile and yield strength in the non-quenched-tem-pered steel containing pearlite is given by the alloying electron structure parameters.

关键词： alloying electron structure parameter hot-continuous rolling structure properties calculation.

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