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| STRUCTURE AND TEMPER EMBRITTLEMENT OF LARGE SECTION 5Cr2NiMoVSi HOT-WORK DIE |
| by HU Xiang; LIN Yansheng; HUANG Zheng'an; .FENG Ganjfang; XU Yuxian (Huazhong University of Science and Technology; Wuhan)(Manuscript received 16 March; 1985; revised manuscript 17 July; 1985) |
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Cite this article:
by HU Xiang; LIN Yansheng; HUANG Zheng'an; .FENG Ganjfang; XU Yuxian (Huazhong University of Science and Technology; Wuhan)(Manuscript received 16 March; 1985; revised manuscript 17 July; 1985). STRUCTURE AND TEMPER EMBRITTLEMENT OF LARGE SECTION 5Cr2NiMoVSi HOT-WORK DIE. Acta Metall Sin, 1987, 23(5): 369-373.
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Abstract To investigate the structure of quenched and tempered large section die, the cooling rate simulating that of central part for 300×300mm section has been used during quenching. As a comparision, ordinary quenching process has also been carried out. TEM observation shows that the structure of the latter is mainly lath martensite, and that of the former is B_I -bainite, which possesses higher temper stability than those found in low carbon low alloy steels. Transforming of great quantity of retain austenite and creating of chain-like distributed M_3C are considered as the main reason of the embrittement for the large section dies.
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Received: 18 May 1987
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1 范雄主编.X射线金属学,机械工业出版社,1981
2 Bhadeshia H K D H, Edmonds D V. Metall Trans, 1979; 10A: 895
3 Huang Der-Hung, Thomas G. Metall Trans, 1977; 8A: 1661
4 大森靖也,大谷泰夫,邦武立郎.铁钢,1971;57:1690
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