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A measurement method for austenite grain size of high carbon steel wire rod

A technology of austenite grains and measuring methods, applied in the directions of measuring device, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of unsuitable long-term large-scale detection and use, toxic picric acid, chronic poisoning, etc., and achieve the success rate High, simple sample preparation, accurate measurement effect

Active Publication Date: 2016-04-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

In addition, picric acid is toxic, and it is easy to cause chronic poisoning after contact with the skin, so it is not suitable for long-term large-scale testing

Method used

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  • A measurement method for austenite grain size of high carbon steel wire rod
  • A measurement method for austenite grain size of high carbon steel wire rod
  • A measurement method for austenite grain size of high carbon steel wire rod

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Experimental program
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Embodiment

[0017] Taking the SWRH82B and SWRS92B wire rods with a diameter of 13mm as an example, the chemical composition of the two is shown in Table 1. Cut 10cm long wire rods from the above two wire rods respectively, and then use a metallographic cutting machine to cut 3 gaps with a depth of about 3-4mm on the two wire rods, and then put the two wire rods into the heating furnace After heating for 10 minutes, quickly put the two sections of wire rod into cold water below 30°C, and keep stirring until the wire rod is completely cooled; then dry the wire rod with a hair dryer, and then use a hammer along the gap Break the wire rod. The fracture of the wire rod was observed and photographed under the scanning electron microscope, and the photographs were as follows: figure 1 and figure 2 As shown, the grain size was finally measured using the measurement tool on the scanning electron microscope, and the average grain size of the two was 35.2 μm and 11.0 μm, respectively.

[0018] T...

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Abstract

The invention discloses a high-carbon steel wire rod austenite crystal grain size measuring method. The method comprises the following steps of: firstly, horizontally cutting a plurality of notches vertical to the length direction of a wire rod; then, heating the wire rod with the notches in a heating furnace so as to enable the wire rod to be austenitized completely, wherein the heating temperature is generally 860 DEG C-1300 DEG C; then, placing the heated wire rod rapidly into cold water for quenching treatment; and finally, breaking a quenched sample along the notches, photographing fractures cracking along crystals by a scanning electron microscope, observing the three-dimensional morphologies of crystal grains on the fractures directly by the scanning electron microscope, and measuring the sizes of the crystal grains. The method provided by the invention can be used for preparing samples simply, does not require corrosion, is high in success rate, and can accurately determine the sizes of the high-carbon steel wire rod austenite crystal grains.

Description

technical field [0001] The invention relates to a method for measuring the grain size, in particular to a method for measuring the austenite grain size of a high-carbon steel wire rod. Background technique [0002] High-carbon steel generally has a pearlite structure in the hot-rolled state, and the austenite grain size is difficult to measure directly. Ordinary direct corrosion method, network ferrite method, etc. are not suitable for the measurement of austenite grains of high carbon steel. As the carbon content increases, the difficulty of revealing grain boundaries by etching also increases. Especially when the carbon content in the steel exceeds the eutectoid steel composition, it is more difficult to show the austenite grain boundary. [0003] At present, there are mainly two methods for the detection of austenite grain size of high carbon steel wire rod: oxidation method and direct quenching method. [0004] The chemical activity of metal is different in its grain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
Inventor 王雷李平麻晗
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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