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Hot fatigue performance test and analysis method for steel

An analysis method and thermal fatigue technology, applied in the direction of analyzing materials, optical testing flaws/defects, measuring devices, etc., can solve the problems of slow heating and cooling, and achieve the effect of avoiding errors

Inactive Publication Date: 2008-01-16
SHANGHAI UNIV
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AI Technical Summary

Problems solved by technology

The disadvantage of these two test devices is that the heating and cooling speed is slow, and the sample is moved to the cooling medium for cooling.

Method used

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  • Hot fatigue performance test and analysis method for steel
  • Hot fatigue performance test and analysis method for steel
  • Hot fatigue performance test and analysis method for steel

Examples

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Embodiment Construction

[0029] A preferred embodiment of the present invention is described in the following:

[0030] In this example, two kinds of hot work die steels (SDH2 and ASSAB8407) with different components were used for the test. The smelting conditions of the two groups of samples were the same, and then both were quenched at 1020°C, and the hardness was adjusted by tempering. To 48 ~ 49HRC.

[0031] The steps of using the thermal fatigue performance testing and analysis system of the present embodiment are as follows:

[0032] 1. First, before the thermal fatigue test, the sample is processed according to the requirements, and the surface is ground to a polished state (see Figure 2).

[0033] 2. Conduct a thermal fatigue test (see Figure 1). The solid state relay (XMT62X series intelligent self-tuning PID industrial regulator) is set to a maximum heating temperature of 700°C, and the heat treatment process controller is set to a cooling time of 7.5s. After 3000 cycles of alternating co...

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Abstract

The invention relates to a test and analysis method of the heat weary performance of steel, which belongs to the field of the performance and test analysis of metal material. The invention is characterized in that the quantitative research and analysis of the heat weary performance is realized. And the invention has following technological processes and steps: (1) the specimen is processed into a shape which has two side surfaces, one of the two surfaces is connected with temperature controlling equipment through a thermo-element, and the highest heating temperature of the specimen can be controlled. The two surfaces are both grinded into the state of polishing. (2) The specimen is put in the center of the induction coil of the heat weary performance testing machine, and then is cooled by circulation cooling water; the highest heating temperature is set, and the cooling time is set. After the heat weary performance testing, the specimen is processed with etch cleaning, and the oxide skin on the surface of the specimen is removed; cracks on the surface of the specimen is given a photo by zoom stereo microscope; the specimen is cut crosswise along the closest packed cracks, and then is grinded and polished and is again given a photo of the sectional plane. (3) The photo is input into the computer, and the cracks are quantitatively analyzed by heat weary performance cracking image analysis system.

Description

technical field [0001] The invention relates to a method for testing and analyzing thermal fatigue properties of steel, belonging to the field of testing and analyzing properties of metal materials. Background technique [0002] Thermal fatigue refers to the phenomenon that the surface of metal materials will form network cracks under the alternating action of cold and heat cycles. Thermal fatigue is one of the main reasons for the failure of hot work die steel. [0003] At present, the evaluation of the thermal fatigue performance of hot work die steel is mainly based on the Uddeholm thermal fatigue evaluation standard atlas. Because this evaluation method is an artificial comparison of pictures, the result is inaccurate, and the error caused by humans is very large. In addition, although some researchers use the length of cracks after fatigue to evaluate the thermal fatigue performance, the range considered by this method is too narrow, and factors such as the shape and ...

Claims

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Application Information

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IPC IPC(8): G01N3/60G01N21/95
Inventor 吴晓春谢豪杰闵永安许珞萍
Owner SHANGHAI UNIV
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