Dual-phase steel color metallographic coloring agent and color display method thereof

Abstract

The invention discloses a dual-phase steel color metallographic coloring agent and a color display method thereof, belongs to a decoration agent for steel material metallographic display, and in particular relates to a decoration agent for steel color metallography and a color metallographic display method. The color metallographic coloring agent is prepared by mixing 40 to 60 volume percent of 0.8 to 3.0 percent sodium pyrosulfite solution and 40 to 60 volume percent of 2.0 to 6.0 percent picral and adding 0 to 0.02g of low-carbon steel scrap sample at the constant temperature of between 30 and 40 DEG C, and is prepared by the steps of sampling, coarse grinding, fine grinding, coarse polishing, fine polishing, coloring agent solution preparation, coloring, microstructure observation, color image acquisition and black-and-white image acquisition. The invention has the advantages that: the concept is novel, the coloring agent solution has stable performance, and the coloring process issimple and reliable; and the coloring agent solution can clearly distinguish bainite or island martensite and a polygonal ferritic structure in dual-phase steel, provides guarantee for the identification and quantitative detection of a microstructure in the steel, facilitates the research and development of products and achieves obvious economic benefit and social benefit.

Description

technical field [0001] The invention belongs to a decoration agent for metallographic display of steel material microstructure, in particular to a decoration agent for steel color metallographic display and a method for color metallographic display. Background technique [0002] Dual-phase steel is a high-strength steel mainly used in automobile wheels or structural parts. The microstructure of this steel is mainly ferrite + martensite or ferrite + bainite. The content of martensite or bainite in steel has an important influence on the properties of steel, so quantitative analysis of martensite or bainite is required. Black and white metallography is now used. The defect is that in the black and white metallographic structure, the ferrite is white, and it is easier to identify the ferrite, while the island martensite and bainite are both gray and black, so it is difficult to distinguish, which becomes the bottleneck in the quantitative analysis of the structure , affecting...

AI Technical Summary

Problems solved by technology

The defect is that in the black and white metallographic structure, the ferrite is white, and it is easier to identify the ferrite, while the island martensite and bainite are both gray and black, so...

Images