汽车大梁钢粉状氧化铁皮剥落定量评价分析

doi:10.13228/j.boyuan.issn0449-749x.20220386

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Abstract After hot rolling,the automobile beam steel plate is directly used for stamping and forming of automobile parts. The control of its surface iron oxide scale is responsible to the stability of the stamping process and the workshop environment. Therefore,it is of great theoretical and practical significance to carry out quantitative evaluation and analysis on the spalling of powdered iron oxide scale for automobile beam steel. In order to improve the serious powdered iron oxide flaking of beam steel,the spalling amount and composition analysis of iron oxide powder have been carried out under different hot rolling finishing temperatures and coiling temperatures through industrial tests. The layered structure and density of iron oxide scale have been investigated by scanning electron microscope. The relationship between iron oxide in Fe₃O₄ and FeO contents and iron oxide flaking problem has been studied on the hot rolled 610L steel through industrial tests. When the mass percent of Fe₃O₄ is 80% and the mass percent of FeO is of about 3%,iron oxide of 610L steel is the least likely to fall off. The oxide scale is able to form the "black steel" characteristics with high plasticity and non-falling powder. The relationship between FeO content and flaking characteristics of iron oxide scale has been investigated through a three-point bending experiment for simulating the subsequent cold forming processing with oxide scale spalling. The iron oxide scale with high FeO content flakes more than those with low FeO content under small deformation condition in plastic bending process. In the case of large deformation,the iron oxide scale peels less than the sample with less FeO content. The characteristics of flaking weight shows a "first negative and then positive" trend. With the increase of bending displacement,the oxide scale spalling increases gradually. The scale spalling on the compression surface is more than that on the tension surface. Under the action of tensile stress,the iron oxide scale on the tensile surface produces a strip crack perpendicular to the length of the specimen,while the iron oxide scale on the compressive surface peels off in the form of a large fragment. The low strength and excellent plasticity of FeO is responsible to the flaking rule of iron oxide scale with different FeO contents.

Key words： hot rolled steel sheet iron oxide scale flaking mass bending test beam steel

Received: 01 June 2022

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	ZHANG Jie
	KONG Ning
	WANG Yi-bo
	SONG Yu-wei

Cite this article:

ZHANG Jie,KONG Ning,WANG Yi-bo等. Quantitative evaluation and analysis on spalling of powdered iron oxide scale for automobile beam steel[J]. Iron and Steel, 2023, 58(1): 125-132.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220386 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I1/125

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