工艺参数对经济型耐候钢显微组织及硬化机理的影响

doi:10.11896/cldb.20120194

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Abstract In this paper, the continuous cooling transformation of weathering steels with different compositions was analyzed by thermal simulation test. The microstructures and properties of the specimens at different coiling temperatures were investigated, and the hardening mechanism was analyzed. The results showed that the transformation of ferrite and pearlite occurred at lower than cooling rate of 10 ℃/s, and bainite transformation began when the cooling rate was higher than 10 ℃/s. The increase of Ni or P promoted the probability of bainite transformation. At low cooling rate, the hardening mechanisms for 0.14%Ni steel were mainly grain refinement and precipitation, while the mechanisms for low Ni steel and high P steel were mainly grain refinement. The maximum hardness could be obtained when the cooling rate was 10 ℃/s and the coiling temperature was between 580—620 ℃. Ni or P had little effect on the maximum hardness after coiling. After coiling process, precipitation strengthening became the main hardening mechanism. The precipitation strengthening of low Ni steel was increased by 13%, while the high P steel was increased by 7%, and that of the 0.14% Ni steel increased by 3%. The coiling process promoted precipitation strengthening of different experimental steels, especially for low Ni steel and high P steel.

Key words： weathering steel controlled rolling and controlled cooling hardening mechanism

Published: 25 January 2022 Online: 2022-01-26

CLC number:

TG142.1

Fund:Cooperation Project Between University of Science and Technology Beijing and Maanshan Iron and Steel Co., Ltd., 2020-2022 Youth Talent Promotion Program of Beijing Society of Mechanical Engineering.

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	Articles by authors
	PENG Tianen
	LIAN Zhiwei
	HE Bo
	HU Xuewen
	JIANG Bo
	LIU Yazheng

Cite this article:

PENG Tianen,LIAN Zhiwei,HE Bo, et al. Effect of Process Parameters on Microstructure and Hardening Mechanism of Economical Weathering Steel[J]. Materials Reports, 2022, 36(2): 20120194-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20120194 OR http://www.mater-rep.com/EN/Y2022/V36/I2/20120194

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