Method for simply and quickly measuring volume ratio of continuous cooling two-phase transformation
A volume ratio, phase transition technology, applied in the investigation phase/state change, complex mathematical operations, instruments, etc., can solve the problems of large calculation error, cumbersome measurement method operation process, etc., to achieve the effect of small calculation error and simple operation method
Active Publication Date: 2020-05-15
JIANGXI UNIV OF SCI & TECH
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The technical problem to be solved by the present invention is the method for measuring the volume ratio of the two phases of continuous cooling of metal materials in the prior art. When the phase transition temperature intervals partially overlap, the operation process of the measurement method for the volume fraction of each phase is cumbersome and the calculation error is relatively large.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0036] A series of data on the thermal expansion of a metal material as a function of temperature under the condition of a cooling rate of 0.8°C / s is measured by Gleeble, and the thermal expansion accuracy reaches 10 -5 mm with a temperature accuracy of 10 -2 ℃, and the data acquisition frequency is 1 Hz. By sorting out the data accordingly, the numerical differential curve of the obtained volume fraction (corresponding to the temperature change) is shown as figure 1 shown. figure 1 The curve in shows the superposition of two waves, the first wave and the second wave respectively correspond to the two successively transformed phases.
[0037] Step 1: Determine and mark the trough point A of the second wave on the curve;
[0038] Step 2: draw a vertical line o perpendicular to the abscissa through point A, draw another straight line p through point A, the straight line p is on the right side of the vertical line o, the differential curve of the phase change volume fraction, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for simply and rapidly measuring the volume ratio of continuous cooling two-phase transformation, and belongs to the technical field of physical materials. The method comprises the following steps: firstly, measuring a thermal expansion curve of a metal material in a continuous cooling two-phase transformation process; carrying out lever method processing on the curve to obtain temperature change data corresponding to the phase change volume fraction; performing temperature numerical differentiation on the phase-change volume fraction data to obtain differentialdata of the phase-change volume fraction, and drawing a differential curve of the temperature corresponding to the phase-change volume fraction; drawing a vertical line and a straight line on the differential curve, dividing a closed graph defined by the differential curve and horizontal coordinates into three areas, calculating the volume ratio of two phases through the areas of the three areas,and the deviation of a calculation result being about + / -6%. The method can solve the calculation problem of the volume fraction of each phase when the phase change temperature intervals are partially overlapped, and has the beneficial effects of simpler operation process and smaller calculation result error.
Description
technical field [0001] The invention relates to the technical field of physical materials, in particular to a method for simply and quickly measuring the volume ratio of two-phase transformation in continuous cooling. Background technique [0002] The phase volume ratio is an important content of the structure characterization of metal materials and an important basis for analyzing and judging the mechanical properties of materials. The thermal simulation method is usually used to obtain the phase change data in the thermal process of metal materials. When calculating the phase volume ratio, the methods that can be used include the metallographic method, the lever method and the extended lever method. Since the metallographic method and the leverage method cannot calculate the volume ratio of the two phases in many practical situations (for example, when the transition temperature ranges of the two phases overlap and the microstructure is similar), the extended leverage meth...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N25/02G01N25/16G06F17/13G06F30/20G16C60/00
CPCG01N25/02G01N25/16G06F17/13G16C60/00
Inventor 雷玄威杨荣玻赖朝彬肖琳琳丁佳俊
Owner JIANGXI UNIV OF SCI & TECH