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Method for determining microscopic mechanics performance of each consist composing phase in polyphase material

A multiphase material, micromechanics technology, applied in the direction of analyzing materials, measuring devices, strength properties, etc., can solve problems such as no data point grouping

Active Publication Date: 2008-07-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, these literatures do not report how to group the data points obtained from the test and make a one-to-one correspondence between the data groups and the constituent phases, which is precisely the key to determining the microscopic mechanical properties of the constituent phases of multiphase materials

Method used

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  • Method for determining microscopic mechanics performance of each consist composing phase in polyphase material
  • Method for determining microscopic mechanics performance of each consist composing phase in polyphase material
  • Method for determining microscopic mechanics performance of each consist composing phase in polyphase material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The multiphase material to be tested is spheroidized annealed GCr15 bearing steel, and its microstructure is as follows: figure 2As shown, spherical carbides (cementite, θ) are distributed in the matrix ferrite phase (F), and the average diameter of the particles is 0.5 μm.

[0061] The specific scheme of the nanoindentation test is shown in Table 1. The obtained 119 effective data points are listed in Table 2 in order of hardness from high to low. It can be seen that the first 9 data points form a group of their own (in the thick line box in the upper left corner of the table), and their hardness is obviously higher than that of the rest of the data points. If the above 119 effective data are plotted in the plane Cartesian coordinate system, we can get the following image 3 E-H scatter plot shown. From this, it can be seen more intuitively that there are indeed 9 data points forming a group by themselves (the upper part of the figure), and their hardness is obviou...

Embodiment 2

[0069] The multiphase material to be tested is ferritic-austenitic duplex stainless steel in as-cast state, and its microstructure is as follows: Figure 4 As shown, there are coarse dendritic austenite phases (A) distributed in the matrix ferrite phase (F).

[0070] The specific scheme of the nanoindentation test is shown in Table 1, and the scatter diagram of the 228 effective data points obtained in the test is shown in Table 1. Figure 5 . It can be seen that these data points are not grouped naturally, but because the steel is cast, the dendrites are very thick (see Figure 4 ). This can easily be determined one by one by light microscopy (“after the fact”) after the press-fit test Figure 6 The constituent phases corresponding to each indentation point in the Figure 5 The constituent phases corresponding to each data point in , the final result of the judgment is shown in Figure 7 . due to m min =82>5, the aforementioned nanoindentation test scheme (see Table 1)...

Embodiment 3

[0071] Embodiment 3 (the linear analysis result of embodiment 2):

[0072] Since the data points do not have natural groupings, Example 2 uses hindsight ( Figure 6 ) to determine the correspondence between the data points and the constituent phases ( Figure 7 ). analyze Figure 7 , if a straight line is drawn in the figure to divide the data points into two groups, most of the data points on the left side of the dividing line correspond to the austenite phase (A), and most of the data points on the right side correspond to the ferrite phase ( F). This means that the linear analysis method can be used to approximate the correspondence between the data points and the constituent phases without the condition of "observation after the fact". When solving the boundary equation shown in formula (1), it is necessary to ensure that the total number of misjudged data points (that is, the wrong correspondence between data points and composition phases) is the least. Thus, determi...

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Abstract

A method for measuring microcosmic dynamic properties of each compositive phase in a multiphase material comprises the following steps that: (1) a multiphase material sample to be measured is prepared; (2) one or a plurality of test areas are selected on the surface of the sample to be measured randomly to perform the nanometer pressing-in test, test points are arranged in a way of grid, grid nodes and impressing points are put into a one-to-one correspondence; (3) the test result is analyzed initially to get E-hardness H data pairs of available elastic modules with the number of Ne, a scattergraph is drawn in a data summarization list or in an E-H rectangular plane coordinates system; (4) the effective data points with the number of Ne are sorted, the data group and the compositive phases are in a one-to-one correspondence; (5) the volume fraction and the microcosmic dynamic properties of each compositive phase are determined according to the data group. Therefore, each compositive phase content, the elasticity modulus and the hardness of the multiphase material can be measured conveniently and flexibly; the measure result is intuitive and reliable, thereby being particularly suitable for the measurement of the microcosmic dynamic properties of each compositive phase in the multiphase materials such as the multiphase steel, the polymer, the biological materials and the composite materials, etc.

Description

technical field [0001] The invention relates to a method for measuring the microscopic mechanical properties of each constituent phase in a multiphase material, in particular to a method for measuring the elastic modulus and hardness of each constituent phase in a multiphase material. Background technique [0002] Multiphase materials have rich and colorful organizational properties, widely exist in nature or engineering, and are widely used in engineering structures. As the name implies, a multiphase material is a material that contains at least two different types of constituent phases in its microstructure. The microscopic properties (including micromechanical properties) and phase ratio (or content, usually expressed in volume fraction) of these constituent phases have a decisive influence on the macroscopic properties (including macroscopic mechanical properties) of multiphase materials. It is for this reason that people can develop and even design various multiphase m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N3/00G01N1/32G06F19/00
Inventor 宋洪伟王秀芳杨晓萍史弼
Owner BAOSHAN IRON & STEEL CO LTD
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