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| TEM STUDY OF SECONDARY CARBIDES PRECIPITATION IN LOW ALLOYED HIGH SPEED STEEL DURING TEMPERING |
| by DING Peidao; PAN Fusheng; ZHOU Shouze (Chongqing University) (Manuscript received 27 November; 1985; revised manuscript 16 July; 1986) |
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Cite this article:
by DING Peidao; PAN Fusheng; ZHOU Shouze (Chongqing University) (Manuscript received 27 November; 1985; revised manuscript 16 July; 1986). TEM STUDY OF SECONDARY CARBIDES PRECIPITATION IN LOW ALLOYED HIGH SPEED STEEL DURING TEMPERING. Acta Metall Sin, 1987, 23(4): 285-404.
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Abstract The precipitation of secondary carbides in low alloyed high speed steel W3-Mo,2Cr4VSi during tempering and the influonce of Si, containing 0.2-2.3%, upon it were observed under TEM. It is shown that the disc-shaped carbide of MC-type, the ratio of thickness to diameter about 0.3-0.4, is the predominant finely dispersed secondary precipitate which is responsible for the peak hardness during tempering at 560℃. The orientation between MC carbide and matrix is found to be fulfilled the Baker-Nutting's relation: {010}_(MC)//{010}_α, <001>_(MC)//<101>_α The MC carbide is made fine during tempering at 560℃ when Si is added to steel, and the coarse M_6C carbide accelerated to precipitate along martensite boundary at 650℃. The MC morphology and the effect of Si on the precipitation of MC carbide are also discussed.
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Received: 18 April 1987
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