2%铝质量分数超高碳钢的球化退火工艺

doi:10.13228/j.boyuan.issn0449-749x.20170215

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Abstract In order to obtain a fully spheroidizing microstructure， the spheroidizing annealing process for ultra-high carbon steel with 2% aluminum addition （UHCS-2Al） was studied based on the mechanism of divorced eutectoid transformation. It is found that the forging microstructure of the ultra-high carbon steel with aluminum addition is composed of the pearlite with different interlamellar spacing and the continuous carbide networks due to the inhomogeneity of the composition. It is difficult to make it completely spheroidization only by using divorced eutectoid transformation process. The thickness of carbide networks is below 1 μm， normalizing below[Acm]temperature can obtain uniform and fine pearlites and eliminate carbide networks. It can also reduce the number of strip shape carbides in normalizing microstructure by increasing the normalizing temperature， which is beneficial to get better spheroidizing microstructure. The complete spheroidizing microstructure for UHCS-2Al consisted of ultrafine ferrite and fine spherical cementite was obtained after normalizing at 900-925 ℃， austenitizing at 830 ℃ and then isothermal treatment for 4 h at 760 ℃.

Key words： ultrahigh carbon steel Aluminum addition spheroidizing process normalizing divorced eutectoid transformation

Received: 05 May 2017 Published: 21 December 2017

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	Articles by authors
	ZHANG Mo-Li
	YU Hui
	XU Hai-Feng
	YU Feng
	XU Ta
	CAO Wen-Quan

Cite this article:

ZHANG Mo-Li,YU Hui,XU Hai-Feng等. Spheroidizing process of ultrahigh carbon steel with 2% aluminum addition[J]. Iron and Steel, 2017, 52(12): 67-74.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20170215 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I12/67

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