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Numerical model establishment and verification of cold pilgering on cycle feed rate 被引量:2
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作者 Zhi-bing Chu Dong Wei +3 位作者 lian-yun jiang Duo Zhang Qing-xue Huang Yu-gui Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第4期398-408,共11页
A numerical model was established to calculate the cycle feed rate through studying the case of a cold pilger mill with the 304 stainless steel pipe. Firstly, the precise constitutive equation of 304 stainless steel w... A numerical model was established to calculate the cycle feed rate through studying the case of a cold pilger mill with the 304 stainless steel pipe. Firstly, the precise constitutive equation of 304 stainless steel was obtained through nonlinearly fitting the true stress-strain data from unidirectional tensile test. Then, the numerical method to calculate the equivalent deformation was determined according to the plastic deformation feature of the steel tube during cold rolling and the incremental theory. Finally, the cycle feed rate of cold roiled 304 stainless steel pipe was extracted when formulating springback through utilizing above results comprehensively and unloading law. Stress state, metal flow, finished pipe size and distribution of residual stress were obtained by finite element method to calculate the whole rolling process when the cycle feed rate was 10 mm, and the optimized model was verified through finished pipe size. 展开更多
关键词 Cycle feed rate Cold pilgering 304 stainless steel pipe Constitutive relationship Incremental theory Unloading law Residual stress experiment
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Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast Cooling 被引量:2
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作者 lian-yun jiang Chun-jiang ZHAO +3 位作者 Jian-hui SHI Guo YUAN Xue-qiang WANG Qing-xue HUANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第8期694-702,共9页
Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling (UFC). Surface temperature would rise when temperature deviation goes up to an extent, and strip re-redden... Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling (UFC). Surface temperature would rise when temperature deviation goes up to an extent, and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure, property and temperature control precision. Thus, it is necessary to conduct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip temperature trends for various strip thicknesses and ultra-fast cooling rates were obtained by numerical calculation method. Re-reddening temperature, temperature deviation between surface and center, and boundary layer position changing law were obtained. By comparison, some conclusions were obtained: UFC re-reddening temperature and laminar cooling (LC) re-reddening temperature were linear to ultra-fast cooling rate respectively. Ultra-fast cooling rate affected UFC re-reddening temperature greatly, but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature, LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness. 展开更多
关键词 ultra-fast cooling laminar cooling cooling rate re-reddening temperature
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