Austenite grain size display method of wire rod for prestressed steel stranded wire

Abstract

The invention discloses a method capable of completely and clearly displaying the Austenite grain size of a wire rod for a prestressed steel stranded wire. The method is realized through the following steps of: preparing a test specimen to be tested: putting a 15cm-long wire rod in a muffle furnace at 860 DEG C plus or minus 10 DEG C for heating and then quenching and cooling the wire rod in cooling water at room temperature; tempering the wire rod for one hour in a furnace at approximately 200 DEG C; preparing corrosive agent: adding 6g of picric acid into 100ml of distilled water, continuously agitating, then adding five drops of cleanser essence, agitating, finally adding 3g of copper sulfate and placing for 12 hours; heating the corrosive agent to 60 DEG C, putting the test specimen to be tested in the corrosive agent to corrode the test specimen to be tested for 1.5 minutes, taking out the test specimen to be tested, repeating the corrosion and polishing steps for 3-5 times and finally conducting assessment through a comparison method against a standard map. The Austenite grain size testing method provided by the invention is a simple, convenient and high-efficiency 82B steel Austenite grain size testing method.

Description

technical field [0001] The invention relates to the field of metallographic analysis, in particular to a method for displaying the austenite grain size of wire rods for prestressed steel strands. Background technique [0002] At present, direct hardening method and gradient quenching method are used to detect the austenite grain size of wire rod (82B steel) for prestressed steel strand. In the gradient quenching method, it is difficult to ensure that the part in the cooling liquid is always the same during the operation, and the quenching interface always shakes up and down due to hand shaking, so the final austenite grain size quenched is intermittent, which cannot truly reflect the actual condition of the steel. Heat treatment condition. The direct quenching method is relatively easy to operate, but due to the particularity of 82B steel, it is difficult to clearly display the austenite grain size by the general reagent display method. It is often a dark piece, and the bo...

AI Technical Summary

Problems solved by technology

In the gradient quenching method, it is difficult to ensure that the part in the cooling liquid is always the same during the operation, and the quenching interface always shakes up and down due to hand shaking, so the final austenite grain size quenched is intermittent, which cannot truly reflect the actual condition of the steel. Heat treatment

The direct quenching method is relatively easy to operate, but due to the particularity of 82B steel, it is difficult to clearly display the austenite grain size by the general reagent display method

It is often a dark piece, and the boundary is either severely corroded or blurred, which makes it very difficult to evaluate the grain size, which in turn affects the results