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| Effect of coarse TiN inclusions and microstructure on impact toughness fluctuation in Ti micro-alloyed steel |
| Tao Liu1,2? Mu-jun Long1,2 ? Deng-fu Chen1,2 ? Hua-mei Duan1,2 ? Lin-tao Gui1,2 ? Sheng Yu1,2 ? Jun-sheng Cao1,2 ? Hua-biao Chen1,2 ? He-lin Fan1,2 |
| 1 State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2 Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China |
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Abstract The influence of coarse TiN inclusions on the impact toughness of low-carbon steels microalloyed with titanium was investigated. The microalloyed steels with the total titanium content of 0.053% were selected as impact samples. Charpy V-notch testing results indicated that a significant fluctuation on impact energy was observed. Combined with fractography analysis, microstructure analysis and inclusion investigation, the results revealed that besides the TiN inclusions morphology and size distribution, toughness deterioration was largely attributed to the proportion of the coarse TiN inclusions with size larger than 5��m. Meanwhile, a prediction model of impact energy related to the proportion of coarse TiN inclusions was established. The effects of Ti, N contents and cooling rates during solidification on the precipitation and growth of coarse TiN inclusions were also analyzed with thermodynamic calculation and diffusion-controlled growth model. It was concluded that TiN inclusions began to precipitate at the end of solidification from the dendrites front. Decreasing nitrogen content could significantly reduce the precipitation temperature and decrease the total mass fraction and the final size of TiN inclusions precipitated in mushy zone. TiN inclusions growth tendency was obviously suppressed with the cooling rate increase during solidification. However, titanium content change had little effect on the total mass fraction and the final size of TiN inclusions. Furthermore, in order to ensure that the final TiN size was less than 5��m, the initial nitrogen content in the current steel should be lower than 8.5ppm, or the cooling rate in mushy zone should be more than 2.21 K/s.
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Received: 28 August 2017
Published: 14 November 2018
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2018, Vol. 25 
