Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第5期
论文作者：Chen-yang Qiu Lang Li Lei-lei Hao Jian-gong Wang Yong-lin Kang
文章页码：536 - 546
摘 要：In this report,the microstructure,mechanical properties,and textures of warm rolled interstitial-free steel annealed at four different temperatures（730,760,790,and 820°C）were studied.The overall structural features of specimens were investigated by optical microscopy,and the textures were measured by X-ray diffraction（XRD）.Nano-sized precipitates were then observed by a transmission electron microscope（TEM）on carbon extraction replicas.According to the results,with increased annealing temperatures,the ferrite grains grew;in addition,the sizes of Ti4C2S2 and Ti C precipitates also increased.Additionally,the sizes of Ti N and Ti S precipitates slightly changed.When the annealing temperature increased from 730 to 820°C,the yield strength（YS）and the ultimate tensile strength（UTS）showed a decreasing trend.Meanwhile,elongation and the strain harden exponent（n value）increased to 49.6%and 0.34,respectively.By comparing textures annealed at different temperatures,the intensity of{111}texture annealed at 820°C was the largest,while the difference between the intensity of{111}<110>and{111}<112>was the smallest when the annealing temperature was 820°C.Therefore,the plastic strain ratio（r value）annealed at 820°C was the highest.
Chen-yang Qiu1，Lang Li1，Lei-lei Hao1，Jian-gong Wang2，Yong-lin Kang1
1. School of Materials Science and Engineering,University of Science and Technology Beijing2. Shougang Jingtang United Iron and Steel Co.Ltd.
摘 要：In this report,the microstructure,mechanical properties,and textures of warm rolled interstitial-free steel annealed at four different temperatures（730,760,790,and 820°C）were studied.The overall structural features of specimens were investigated by optical microscopy,and the textures were measured by X-ray diffraction（XRD）.Nano-sized precipitates were then observed by a transmission electron microscope（TEM）on carbon extraction replicas.According to the results,with increased annealing temperatures,the ferrite grains grew;in addition,the sizes of Ti4C2S2 and Ti C precipitates also increased.Additionally,the sizes of Ti N and Ti S precipitates slightly changed.When the annealing temperature increased from 730 to 820°C,the yield strength（YS）and the ultimate tensile strength（UTS）showed a decreasing trend.Meanwhile,elongation and the strain harden exponent（n value）increased to 49.6%and 0.34,respectively.By comparing textures annealed at different temperatures,the intensity of{111}texture annealed at 820°C was the largest,while the difference between the intensity of{111}<110>and{111}<112>was the smallest when the annealing temperature was 820°C.Therefore,the plastic strain ratio（r value）annealed at 820°C was the highest.
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