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EVOLUTION OF SECOND PHASE IN 2.25Cr-1Mo-0.25V STEEL WELD METAL DURING HIGH TEMPERATURE TEMPERING |
TAO Peng1; ZHANG Chi1; YANG Zhigang1;TAKEDA Hiroyuki2 |
1 Key Laboratory for Advanced Materials of Ministry of Education; Department of Materials Science and Engineering; Tsinghua University; Beijing 100084
2 Materials Design Section; Materials Research Laboratory; Kobe Steel Ltd.; Hyogo 651-2271; Japan |
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Cite this article:
TAO Peng ZHANG Chi YANG Zhigang TAKEDA Hiroyuki. EVOLUTION OF SECOND PHASE IN 2.25Cr-1Mo-0.25V STEEL WELD METAL DURING HIGH TEMPERATURE TEMPERING. Acta Metall Sin, 2009, 45(1): 51-57.
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Abstract The evolution of the second phase in 2.25Cr–1Mo–0.25V steel weld metal during holding at 700 ℃ for a series of durations was studied by TEM and EDX. The precipitates in the as– welded specimen are M3C carbides, and during tempering M7C3 and M23C6 carbides appeared. After long term tempering M3C carbides spheroidized and disappeared. In the early tempering stage M7C3 carbide with low wCr/wFe is metastable phase. M23C6 carbide can exist only under low tempering parameter, and M7C3 carbide with high wCr/wFe formed in the late stage is the stable phase. M3C carbides are often sphere–liked, M7C3 and M23C6 carbides are rod–shaped and lump–shaped.
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Received: 04 June 2008
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