| Nb-Ti微合金钢热变形过程中的再结晶和沉淀行为研究 |
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| 引用本文： | 徐有容,王志勇.Nb-Ti微合金钢热变形过程中的再结晶和沉淀行为研究[J].上海大学学报(英文版),2000,4(1):81-86. |
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| 作者姓名： | 徐有容 王志勇 |
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| 作者单位： | XU You rong，WANG Zhi yong School of Material Science and Technology，Shanghai University，Shanghai 200072，China |
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| 基金项目： | NationalNaturalScienceFoundationofChina
!(593710 6 3，595710 6 5) |
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| 摘 要： | 1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｔｈｅｆｕｎｄａｍｅｎｔａｌｐｈｙｓｉｃａｌｍｅｔａｌｌｕｒｇｙｏｆｔｈｅｒｍｏｍｅｃｈａｎｉｃａｌｐｒｏｃｅｓｓｉｎｇ(ＴＭＰ)ｈａｓｂｅｃｏｍｅｍｕｃｈｂｅｔｔｅｒｕｎｄｅｒｓｔｏｏｄｏｖｅｒｔｈｅｌａｓｔｔｗｏｄｅｃａｄｅｓ1～8].ＩｔｉｓｗｅｌｌｃｏｍｍｏｎｌｙｒｅｃｏｇｎｉｚｅｄｔｈａｔｔｈｅｍｉｎｕｔｅａｄｄｉｔｉｏｎｏｆｓｔｒｏｎｇｃａｒｂｏｎｉｔｒｉｄｅｏｒｎｉｔｒｉｄｅｆｏｒｍｉｎｇｅｌｅｍｅｎｔｓｓｕｃｈａｓＮｂ,ＴｉａｎｄＶｔａｋｅｓｖｅｒｙｉｍｐ…
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| 收稿时间： | 29 June 1999 |
Recrystallization and precipitation behavior during the hot deformation of Nb-Ti microalloyed steels |
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| You-rong Xu,Zhi-yong Wang.Recrystallization and precipitation behavior during the hot deformation of Nb-Ti microalloyed steels[J].Journal of Shanghai University(English Edition),2000,4(1):81-86. |
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| Authors: | You-rong Xu Zhi-yong Wang |
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| Institution: | School of Material Science and Technology, Shanghai University, Shanghai 200072, China |
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| Abstract: | Constant strain rate compression tests at the temperature 900∼1100 °C and the strain rate 10−3∼20 s−1 and the interpass time 300∼1000 s of double stage interrupted tests were carried out for a microalloyed steel containing
0.024 % Nb, 0.016 % Ti, 1.39 % Mn and 0.15%C, to investigate its dynamic (DRX), static (SRX) and metadynamic recrystallization
(MDRX) and precipitation behavior. Softening curves were determined by the offset method and back extrapolation method. It
was found that the SRX and MDRX process have different Avrami exponent n and apparent activation energy Q. For the former n=1, Q=359 kJ/mol, while for the later n=0.57, Q=259 kJ/mol. Influences of temperature, prestrain and strain rate on the kinetics of SRX process were discussed and a mathematical
model was furtherly constructed. Finally, the precipitation-time-temperature (PTT) curve was determined by the stress relaxation
tests, and the influence of precipitation on the SRX process was also discussed. Direct microstructural evidence for precipitation
during and after deformation was obtained by transmission electron microscopy.
Supported by the National Natural Science Foundation of China (59371063,59571065) |
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| Keywords: | hot deformation microalloyed steel recrystallization precipitation |
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