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| Strain Induced Ti(N, C) Precipitation Behavior in Ti Contained Steels |
| CAI Ning* JU Xinhua MENG Zhensheng JIA Huiping Hao Jingli |
| (Shougang Technology Institute, Beijing 100043) |
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Cite this article:
CAI Ning* JU Xinhua MENG Zhensheng JIA Huiping Hao Jingli. Strain Induced Ti(N, C) Precipitation Behavior in Ti Contained Steels. Chinese Journal of Materials Research, 2013, 27(6): 659-664.
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Abstract The strain induced precipitation properties of titanium was investigated by stress relaxation method at 600 - 1100 ℃ temperature, 30% -50% deformation in high Ti contained steels with Ti addition level of 0.15% mass percent. The results show that Ti has a distinct strain-induced precipitation process at 600 - 1100 ℃ temperature range, this process is not only present in the single-phase austenite region, but also in ferrite-austenite two-phase and ferrite single-phase region. The precipitates were downsizing with the decreasing of the temperature. Above 1000℃ size of the precipitates is bigger, but below 900 ℃ precipitates with the size of a few to tens of nanometers appeared. When the temperature decreased to below 700℃, the size of precipitates downsized to 3 nm around. In the temperature range of 800 - 1100℃, the start time of the precipitation were all about 2 seconds, but just began to precipitate a small amount of precipitates at only a few parts at the beginning. Precipitation is a continuous process, and it needed different times in different parts of the sample. 10 seconds later, there would be a homogeneous precipitation process of large number of TiC, and it was ended at 300-700 seconds. The precipitation time - temperature (PTT) curve do not abide by the typical "C" curve feature. Among three deformations, 40% and 30% had similar deformation resistance, the recovery rate and the start time of precipitation, but TiC precipitated faster for 40% deformation than that of 30%. After relaxation, the residual stress was the greatest, and precipitation hardening would be the most obvious for 40%’s deformation. Increasing deformation to 50%, deformation resistance increased distinctly, and recovery became faster while the start time of precipitation delayed from 2 seconds to 2.7 seconds. After relaxation, the residual stress was the lowest for 50% deformation.
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