Novel method for quantitatively characterizing binding force of iron oxide scale and steel matrix

An iron oxide scale and quantitative characterization technology is applied in the field of new quantitative characterization of the bonding force between iron oxide scale and steel matrix.

Pending Publication Date: 2020-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Iron oxide scale is a multi-layer structure, and its bonding force with the steel matrix is ​​a complex comprehensive index. In order to clarify the fundamental mechanism affecting the bonding force from the microscopic level, a method of characterizing the bonding force is particularly important, which gives the bonding force The characterization techniques of the
[0003] Nowadays, the adhesive tape method and the cross-cut method are mainly used to characterize the bonding force between the oxide scale and the steel substrate. The former will fail due to the adhesiveness of the tape (the bonding force between the tape and the oxide layer is smaller than the bonding force between the oxide layer and the substrate). And it only qualitatively describes the large and small binding force, and cannot be quantitatively represented; the latter cross-cut method is not easy to operate and has large errors, that is, the characterization of binding force is far from perfect and standardized.

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  • Novel method for quantitatively characterizing binding force of iron oxide scale and steel matrix
  • Novel method for quantitatively characterizing binding force of iron oxide scale and steel matrix
  • Novel method for quantitatively characterizing binding force of iron oxide scale and steel matrix

Examples

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Effect test

Embodiment 1

[0044] Process the Q690 steel plate with a thickness of 10mm into a full-thickness sample of length and width (both length and width are 8mm), and ensure that the upper and lower surfaces of the sample are smooth and smooth during the processing;

[0045] Grind the processed sample on the sample grinding machine, from 400# sandpaper to 1000# sandpaper (specifically, grind with the change of 400#, 600#, 800# and 1000#), to ensure that the surface roughness of the sample is the same , control the rotation speed of the turntable of the sample grinding machine to always keep it at 200-330r / min, then clean the sample section with alcohol and dry it to ensure that the surface of the sample is smooth and clean;

[0046] Put the cleaned sample into the heating furnace to heat, the temperature is controlled at 1100-1150°C, and the holding time is 1-2 hours; the sample oil after heating and holding is cooled to room temperature to ensure the integrity of the oxide scale on the surface to...

Embodiment 2

[0050] Process the HC250IF steel plate with a thickness of 10mm into a full-thickness sample with length and width (both length and width are 6mm), and ensure that the upper and lower surfaces of the sample are smooth and smooth during the processing;

[0051] Grind the processed sample on the sample grinding machine, from 400# sandpaper to 1000# sandpaper, to ensure that the surface roughness of the sample is the same, control the rotation speed of the sample grinding machine turntable at 200-300r / min, and then clean it with alcohol The cross-section of the sample is dried to ensure that the surface of the sample is smooth and clean;

[0052] Put the cleaned sample into the heating furnace to heat, the temperature is controlled at 1100-1200°C, and the holding time is 1-2 hours; the sample oil after heating and holding is cooled to room temperature to ensure the integrity of the oxide scale on the surface to be tested;

[0053] Use the sample grinder again to remove the oxide ...

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Abstract

The invention provides a novel method for quantitatively characterizing the binding force of an iron oxide scale and a steel matrix, relates to the technical field of metal material surface measurement, and aims to quantitatively and accurately judge the binding force of an oxide layer and the matrix and provide a basis for characterization of the binding force of the iron oxide scale and the matrix. The method comprises the following steps: S1, preparing a steel sample with iron oxide scale on the surface; s2, polishing the steel sample, and only retaining the iron oxide scale of the to-be-detected surface; s3, using a diamond scriber to scribe the surface of the iron oxide scale until fracture occurs, and the critical load Lc during fracture is recorded as the value of the binding force;in combination with microscopic analysis, taking a load corresponding to sudden change of an acoustic signal or sudden change of a friction force in a scribing process as a critical load Lc. The technical scheme provided by the invention is suitable for the process of representing the bonding force of the iron oxide scale and the matrix.

Description

【Technical field】 [0001] The invention relates to the technical field of metal material surface measurement, in particular to a novel method for quantitatively characterizing the binding force between oxide scale and steel matrix. 【Background technique】 [0002] Hot-rolled steel sheets need to be heated at high temperature in a heating furnace before rolling, and the heating temperature is generally above 1150°C. After the steel billet comes out of the furnace, a layer of iron oxide scale is formed on the surface. This layer of iron oxide scale needs to be removed by high-pressure water before the preliminary rolling, which is called "descaler" in the industry. The surface quality of the slab after descaling directly affects the subsequent rolling. In order to ensure the effect of descaling, the bonding force between the oxide scale and the matrix must be very low. For iron and steel enterprises with highly developed mechanization and automation, due to the fast pace of pro...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N19/04G01N3/00
CPCG01N3/00G01N19/04G01N2203/0067G01N2203/0641G01N2203/0658G01N2203/0676
Inventor武会宾王超李志超尚成嘉
OwnerUNIV OF SCI & TECH BEIJING