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| Strain induced precipitation behavior of Nb and Ti in S460ML steel |
| ZHANG Yu-cheng，MENG Zhen-sheng，MENG Yang，JU Xin-hua，JIANG Zhong-hang |
| （Research Institute of Technology，Shougang Group Co.，Ltd.，Beijing 100043，China） |
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Abstract In order to study the strain induced precipitation behavior of Nb and Ti in S460ML steel，a series of thermal simulation experiments under different conditions were carried out. The deformation temperature is 900-1 000 ℃. The strain rate is 0.1-5.0 s－1. The deformation amount is 10%-50% and relaxation time is 0-15 min. The precipitation amount and the morphology and size of the precipitates of Nb and Ti under different experimental conditions were analyzed by physical chemical phase analysis method and transmission electron microscope (TEM)，respectively. The results showed that with the increase of relaxation time and the decrease of deformation temperature，the strain induced precipitation rate of Nb and Ti increased. The increase of deformation amount could not only shorten the starting time for strain induced precipitation，but also increase the total amount of the strain induced precipitation of Nb and Ti. As the strain rate decreased，the Nb and Ti strain induced precipitation started earlier，but it showed little effect on total precipitation amount after certain relaxation time. The average size of the precipitation phase decreased with the increase of the deformation amount and relaxation time and the decrease of deformation temperature.
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Received: 07 February 2018
Published: 24 August 2018
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2018, Vol. 53 
