Method for Detecting Austenite Coarsening Temperature of Steel
A technology of austenite and austenite grains, applied in the field of metal material detection, can solve the problems of long time consumption, low precision, and no consideration of the heating and cooling time of the heating furnace, etc.
Active Publication Date: 2016-03-30
SHOUGANG CORPORATION
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Problems solved by technology
Regardless of the heating and cooling time of the heating furnace, it only takes 39 hours to choose a temperature every 20°C between 860°C and 1100°C for 3 hours.
Considering the time of heating furnace heating, heat preservation, cooling, sample preparation, erosion and grain size measurement, the austenite coarsening temperature T of a steel grade is obtained GC It takes more than 50 hours in total, which is very time-consuming
In addition, since the temperature interval is 20°C, the final austenite coarsening temperature T GC Not accurate roughening temperature, low precision
Method used
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Embodiment Construction
[0026] see figure 1 , a method for detecting the austenite coarsening temperature of steel provided by an embodiment of the present invention includes the following steps:
[0027] Step 101: preparing a test sample;
[0028] Step 102: Put the detection sample into the metallographic heating furnace together with the crucible, and then repeat three times of vacuumizing and then introducing argon gas, and then continuously inject high-purity gas with a purity greater than 99.999% into the metallographic heating furnace. Argon, as a protective gas when the test sample is heated;
[0029] Step 103: Heat the test sample continuously at a rate of 150 °C / min to 800 °C, and keep the temperature at a constant temperature for 120 seconds, and then continuously heat at a rate of 15 °C / min to 1350 °C;
[0030] Step 104: During the heating process, the high-temperature laser imaging system above the metallographic heating furnace continuously obtains photos of the austenite grain size of...
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Abstract
The invention provides a method for detecting the Austenitic coarsening temperature of steel. The method comprises the following steps: preparing a detection test piece; placing the detection test piece into a crucible, placing the detection test piece and the crucible into a metallographic-phase heating furnace, repeating operation of vacuumizing and introducing argon for three times, and continuously introducing high-purity argon with the purity of more than 99.999% into the metallographic-phase heating furnace to serve as protective gas during heating of the detection test piece; continuously heating the detection test piece to 800 DEG C at the speed of 150 DEG C / min, maintaining constant temperature for 120 seconds, and continuously heating to 1,350 DEG C at the speed of 15 DEG C / min, wherein in the heating process, a high-temperature laser imaging system above the metallographic-phase heating furnace continuously acquires Austenitic grain size photos of the detection test piece at the temperature interval of 0.1 DEG C, and the temperature at which Austenitic crystal grains start to grow up serve as the Austenitic coarsening temperature. The invention provides a method for detecting the Austenitic coarsening temperature of steel, which has the characteristics of short consumed time and precise temperature detection.
Description
technical field [0001] The invention relates to the technical field of metal material detection, in particular to a method for detecting the austenite coarsening temperature of steel. Background technique [0002] Austenite coarsening temperature T GC is an important parameter affecting the austenite grain size, when the heating temperature is greater than T GC When the temperature increases, the austenite grains coarsen and grow, which will bring irreparable defects to the grain size refinement in the rolling process, and will reduce the toughness of the hot-rolled steel plate; when the heating temperature is lower than T GC When , there are fewer second-phase particles dissolved in austenite, which reduces the dispersion precipitation strengthening effect of the second-phase particles after hot rolling. In order to prevent the coarsening of austenite grains and ensure the solid solution of the second phase particles, the austenite coarsening temperature T of the test ste...
Claims
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IPC IPC(8): G01N25/12
Inventor 邵肖静季晨曦崔阳朱国森李海波潘宏伟李飞包春林陈斌刘柏松阳代军
Owner SHOUGANG CORPORATION