Austenite crystal boundary display method under condition of high-temperature deformation of medium-carbon microalloyed steel

Abstract

The invention relates to an austenite crystal boundary display method under the condition of high-temperature deformation of medium-carbon microalloyed steel, and belongs to the technical field of physical detection. The method comprises the following steps: preparing a sample, immediately quenching after high-temperature deformation, coarsely grinding, finely grinding, polishing, and putting the polished sample into a corrodent at 45 DEG C, wherein in the corrodent formula comprises 60ml tap water, 1.2-1.6g of picric acid, 0.4-0.5g of paste shampoo, 0.04-0.06ml dimethylbenzene, 0.08-0.12ml of hydrochloric acid, 0.06-0.1ml of hydrofluoric acid and 8-10ml of copper chloride; corroding the sample for 1-2 minutes, taking out the corroded sample after the surface of the sample become dark, cleaning with alcohol, and drying, wherein original austenite crystals can be relatively clearly observed under a microscope. The austenite crystal boundary display method has the advantage that the problem that austenite crystals cannot be relatively clearly observed under the condition of high-temperature deformation of the medium-carbon microalloyed steel. The method is simple to implement and convenient to operate.

Description

technical field [0001] The invention relates to a method for displaying austenite grain boundaries of medium-carbon micro-alloy steel under high-temperature deformation conditions, and belongs to the technical field of physical detection. Background technique [0002] The austenite grain size after high temperature deformation in the controlled rolling process will directly affect the structure at room temperature, and have a great impact on the mechanical properties such as strength and toughness of the steel. In the production process of microalloyed steel, it is very important to understand the law of microstructure evolution, rationally control process parameters and ensure product performance. Whether the austenite grains can be clearly displayed depends on various factors such as the chemical composition of the sample, the heat treatment state, the etching method, and the etching time. There are many ways to display austenite, and they are constantly being explored an...

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Problems solved by technology

[0003] Chinese patent CN101349621 discloses "a method for clearly displaying austenite grains of low-carbon and low-alloy steel". 100ml, CrO 3 8~10g, picric acid 1.6~2 g, ethylene oxide 2ml~4ml, this invention uses a specific etchant and a suitable etching method, which can clearly show the austenite grain boundary. Alloy austenite grain boundary display technology is blank, but the disadvantage is that the corrosion time of the sample is as long as 40~60min, and the efficiency is low

[0004] Chinese patent CN101368889A discloses "a method for displaying the original austenite grains of high-strength ship plate steel". The process steps of the method are rough grinding, fine grinding, polishing and corrosion. In the corrosion solution at ℃, the formula of the corrosion solution is: 100ml distilled water, 5~7g picric acid, 0.5~1.5ml hydrochloric acid, 3~5g sodium dodecylbenzenesulfonate, 5~15g seagull brand shampoo, 0.3 hydrogen peroxide ~1ml, after eroding for 1~2 minutes, take it out when the surface of the sample becomes dark, wash it with alcohol, and dry it. The original austenite structure can be observed clearly under the microscope. This method solves the problem of high-strength vessel It is difficult to display austenite grains in plate steel, but whether it is suitable for medium-carbon microalloyed steel under high-temperature deformation conditions has not been involved.

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