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| Precipitation behavior of carbides in W4Mo3Cr4VSi high-speed steel |
| HAO Yong-fei1，CHENG Guo-guang1，XIE You2 |
（1. State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China
2. Technology Center，Zenith Steel Group Co.，Ltd.，Changzhou 213011，Jiangsu，China） |
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Abstract In order to understand the precipitation behavior of the carbide in W4Mo3Cr4VSi(4341)，control them and greatly improve the functional performance of the steel. W4Mo3Cr4VSi steel smelt in actual production were studied. Observing and analyzing the morphology，size and composition of carbides in W4Mo3Cr4VSi steel using scanning electron microscope and energy dispersive spectrometer. The formation mechanism of these carbides were analyzed by Thermo-Calc software. The results show that two types of carbides exist in the steel. The one is W-Mo-rich carbides whose morphologies are granular which were provided to be M6C. The other is V-rich carbides whose morphologies are strips which were provided to be VC. They are both precipitated in liquid phase during solidification. During the solidification of VC，VN precipitate firstly and VC begin to precipitate only when solid mass percent is 78%. Thermal stability of carbides were also studied. M6C carbide are unstable and dissolve after holding at 1 150 ℃ for 6 h，and grain growth after holding at 1 250 ℃ for 6 h. VC carbide are relatively more stable，which dissolve little after holding at 1 150 or 1 250 ℃.
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Received: 08 February 2018
Published: 24 August 2018
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2018, Vol. 53 
