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| In-situ characterization of microstructure evolution of TP347H in solution treatment |
| ZHANG Zhi-feng1,2，BAI Yin2，Lü Zhi-qing1，BAO Han-sheng2 |
（1. Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education，Yanshan University， Qinhuangdao 066004， Hebei， China
2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract To investigate the microstructure evolution regularity of the TP347H stainless steel in the process of solid solution，the isothermal microstructure evolution of TP347H stainless steel at 1 100，1 150 and 1 200 ℃ was observed in situ using confocal scanning laser microscope （CSLM）. The characteristic of precipitates in TP347H was analyzed by SEM and OM，calculated by Thermo-Calc thermodynamic calculation software. The results showed that Nb（C，N） phase precipitated in the TP347H stainless steel during the heat treatment and the mole fraction of Nb（C，N） phase decreased with the increasing of solid solution temperature. The smaller secondary Nb（C，N） could dissolve and precipitate in the process of solid solution treatment，while the primary Nb（C，N） phase would not change. As solid solution temperature increased，the grain size increased quickly，which owed to the re-dissolution of secondary Nb（C，N）. The main way of grain growth were the merging of grains and the grain boundary migration.
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Received: 20 September 2017
Published: 16 March 2018
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2018, Vol. 53 
