钛处理对EH36船板钢中夹杂物及组织特征影响

doi:10.13228/j.boyuan.issn0449-749x.20190511

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Abstract In order to study the influence of titanium treatment (the mold feeding titanium wire) on inclusions in EH36 steel,the size,composition and three-dimensional morphologies of inclusions in EH36 shipbuilding steel were obtained by electrolytic extraction method using non-aqueous electrolytes combined with SEM method. The experimental results show that the Ca-Si-Al system oxide inclusion+MnS in the steel was transformed into Ca-Si-Al-Ti system oxide inclusion+MnS after feeding the titanium wire in the mold,and the three-dimensional surfaces of them changes from smoother to rough and porous. After the welding thermal simulation,the microstructure had transformed from the grain boundary ferrite and side slatted ferrite in a titanium-free sample into acicular ferrite in the containing titanium specimen. What is more,the morphology of ferrite around the inclusion was transformed from block into acicular,the toughness was increased by 70 J. The forming conditions of titanium oxide inclusions in shipbuilding steel were analyzed by the thermodynamic calculation. The calculation results show that there was a competitive relationship between titanium and aluminum which react with oxygen to form oxide. The mass percent of aluminum should be strictly controlled not more than 0.003 5% in liquid steel when the mass percent of Ti was 0.02% in steel. Thus,so as to ensure that a substantial amount of titanium-containing oxide particles could be generated in liquid steel.

Key words： titanium treatment three-dimensional morphology acicular ferrite shipbuilding steel

Received: 25 November 2019

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	Articles by authors
	LUO Deng
	HONG Zhi-wei
	LI Li
	LI Jian
	YANG Li
	ZHANG Xue-wei

Cite this article:

LUO Deng,HONG Zhi-wei,LI Li等. Effect of titanium treatment on inclusions and microstructure in EH36 shipbuilding steel[J]. Iron and Steel, 2020, 55(7): 65-71.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190511 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I7/65

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