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| Effect of heating process on grain growth of#br#
NbTi microalloyed steel |
| LIU Xiang，DU Qunli，LI Xin |
| (Iron and Steel Research Institute, Ansteel Group， Anshan 114009， Liaoning， China) |
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Abstract In order to understand the effects of heating schedule on the austenite grain growth and precipitation behavior，the OM，TEM and EDS were used for studying austenite grain coarsening behavior and microalloying carbonitrides precipitation behavior of NbTi test steel at different of heating temperature(1 150，1 200 and 1 250 ℃) and holding time(0.5，1.0，2.0 and 3.0 h). The experimental results showed that the austenite grain size grew up gradually with the increasing of heating temperature，and the austenite grain grew rapidly when the heating temperature exceeded 1 200 ℃. With the increasing of holding time，the average austenite grain grew up gradually，and the austenite grain grew rapidly when the holding time exceeded 2.0 h. EDS results showed that the precipitates are composite phase (Nb，Ti)(C，N)，however the amounts of precipitate was reduced and the sizes of precipitate increased at higher heating temperature and longer holding time，consequently，the effects of precipitate on austenite grain was decreased. The heating temperature at 1 1501 200 ℃ by holding less than 2.0 h will be more appropriate for NbTi test steel.
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