冷却速率对Ti-Zr处理钢针状铁素体转变的影响

doi:10.13228/j.boyuan.issn0449-749x.20210335

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Abstract The toughness of the low alloy steel is reduced by the wide use of high heat input welding technology and the addition of Ti and Zr elements can promote the nucleation of acicular ferrite which refine the microstructure and improve the properties of the low alloy steel. To study the transformation mechanism of acicular ferrite in Ti-Zr treated steel,the steel required for the experiment was smelted in a 25 kg vacuum induction furnace,0.04% Ti and 0.014% Zr were added to low alloy steel;the effect of different cooling rates on the transformation of acicular ferrite was observed by high temperature confocal microscope;the inclusion of Ti-Zr treated steel and the nucleation of acicular ferrite on the surface of the inclusions was observed by scanning electron microscope;the microstructure under different cooling rates was observed by optical microscope. Through experiments,it is found that with cooling rate increased from 1 ℃/s to 10 ℃/s,the start transformation temperature of side plate ferrite decreased from 770.2 ℃ to 632.4 ℃,the onset transformation temperature of acicular ferrite decreased from 731.5 ℃ to 612.6 ℃,and the area percent of acicular ferrite increased from 47.91% to 68.04%,the ratio of the area fraction for acicular ferrite to side plate ferrite increased from 1.34 to 3.54,and the ratio of the difference between the start and end transformation temperatures for acicular ferrite to side plate ferrite increased from 0.52 to 0.83. There is a proportional relationship between the ratio of area percent and the ratio of the transition temperature range on acicular ferrite and side plate ferrite. The main inclusions in Zr-treated steel were ZrO₂-TiN-MnS and the ZrO₂-TiN-MnS inclusion could effectively promote the nucleation of acicular ferrite. The nucleation mechanism is that transformation driving work increased by Mn-depleted zone the and inclusion has a good lattice matching with ferrite that interface energy was reduced.

Key words： Ti-Zr treated steel cooling rate acicular ferrite high temperature confocal laser scanning microscope transformation temperature

Received: 31 May 2021

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	YAO Hao
	ZHANG Li-Feng
	REN Qiang
	REN Ying
	YANG Wen

Cite this article:

YAO Hao,ZHANG Li-Feng,REN Qiang等. Effect of cooling rates on transformation of acicular ferrite in a Ti-Zr treated steel[J]. Iron and Steel, 2021, 56(11): 96-103.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210335 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I11/96

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